Head-to-head comparison

GPT-6 Astra vs. GPT-5.6 Luna

Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.

shared result series: 260
distinct benchmark metrics: 38
latest retrieval: 2026-10-19

First modelSecond model

Specifications

General specifications

Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.

Specifications for GPT-6 Astra and GPT-5.6 Luna
Attribute	GPT-6 Astra	GPT-5.6 Luna
Provider	OpenAI	OpenAI
Released	Sep 3, 2026	Jul 9, 2026
Availability	Limited access	Active
Model type	Proprietary	Proprietary
Parameters	Not published	Not published
Architecture	Not published	Not published
Context window	1,050,000 tokens	1,050,000 tokens
Knowledge cutoff	April 30, 2026	February 16, 2026
Technical sources	Model, Context	Model, Context, Knowledge cutoff

Pricing

API pricing compared

The table compares official standard API rates per 1M tokens, including published cache pricing. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.

API pricing for GPT-6 Astra and GPT-5.6 Luna
Price type	GPT-6 Astra	GPT-5.6 Luna
API input	$10 ≤272K / $20 >272K	$0.2 ≤272K / $0.4 >272K
API output	$50 ≤272K / $75 >272K	$1.2 ≤272K / $1.8 >272K
Cache read	$1 ≤272K / $2 >272K	$0.02 ≤272K / $0.04 >272K
Cache write (5 min.)	$12.5 ≤272K / $25 >272K	$0.25 ≤272K / $0.5 >272K
Cache write (1 hr.)	Not listed	Not listed
Price verified	09/22/2026 Source	09/22/2026 Source

GPT-6 AstraGPT-5.6 Luna

API inputUSD per 1M tokens, base tier

GPT-6 Astra$10

GPT-5.6 Luna$0.2

API outputUSD per 1M tokens, base tier

GPT-6 Astra$50

GPT-5.6 Luna$1.2

Cache readUSD per 1M tokens, base tier

GPT-6 Astra$1

GPT-5.6 Luna$0.02

Key to the marks:better valuebetter, but not conclusivetie

Pricing by provider

Direct developer pricing and provider endpoint tariffs routed through OpenRouter are listed separately. Prices are in USD per 1M tokens. Context-dependent direct tiers plus regional, Flex, Priority, and other OpenRouter tariffs remain individually identifiable.

Provider pricing for GPT-6 Astra and GPT-5.6 Luna
Model	Provider	Purchase route and tariff	Input per 1M tokens	Output per 1M tokens	Source
GPT-6 Astra	OpenAI	Direct from developerUp to 272,000 context tokens	$10	$50	Source09/22/2026
	OpenAI	Direct from developerAbove 272,000 context tokens	$20	$75	Source09/22/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock/us-west-2	$11	$55	Source10/19/2026
	Azure	Via OpenRouterazure	$10	$50	Source10/19/2026
	Azure	Via OpenRouterazure/us	$11	$55	Source10/19/2026
	OpenAI	Via OpenRouteropenai	$10	$50	Source10/19/2026
	OpenAI	Via OpenRouteropenai/fast	$20	$100	Source10/19/2026
	OpenAI	Via OpenRouteropenai/flex	Lowest listed price: $5	Lowest listed price: $25	Source10/19/2026
	OpenAI	Via OpenRouteropenai/ultrafast	$60	$300	Source10/19/2026
GPT-5.6 Luna	OpenAI	Direct from developerUp to 272,000 context tokens	$0.2	$1.2	Source09/22/2026
	OpenAI	Direct from developerAbove 272,000 context tokens	$0.4	$1.8	Source09/22/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock/us-east-1	$0.22	$1.32	Source10/19/2026
	Azure	Via OpenRouterazure	$0.2	$1.2	Source10/19/2026
	Azure	Via OpenRouterazure/eu	$0.22	$1.32	Source10/19/2026
	Azure	Via OpenRouterazure/us	$0.22	$1.32	Source10/19/2026
	OpenAI	Via OpenRouteropenai	$0.2	$1.2	Source10/19/2026
	OpenAI	Via OpenRouteropenai/fast	$0.4	$2.4	Source10/19/2026
	OpenAI	Via OpenRouteropenai/flex	Lowest listed price: $0.1	Lowest listed price: $0.6	Source10/19/2026

Performance

Shared benchmarks

Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.

Capability profile from matched benchmarks

Each axis averages directly matched benchmark families. A value of 100 means the stronger value within this pair, not a universal quality score.

GPT-6 Astra

GPT-5.6 Luna

Coding: 99.9 / 44.2 (8 benchmark families)

Reasoning: 99.6 / 72.9 (3 benchmark families)

Mathematics: 100 / 60.6 (1 benchmark family)

Knowledge: 100 / 39.9 (1 benchmark family)

Finance: 94.1 / 95.3 (3 benchmark families)

Legal: 98.1 / 92.6 (2 benchmark families)

Agentic tasks: 100 / 75.4 (5 benchmark families)

Multimodal: 100 / 89.6 (1 benchmark family)

222 matched rows from 31 benchmark families were considered. The radar shows 8 of 12 comparable categories.

GPT-6 AstraGPT-5.6 Luna

AA-BriefcaseOverall. Higher is better. No documented setup difference

GPT-6 Astra1,546.7 elo

GPT-5.6 Luna1,267.93 elo

AA-LCROverall. Higher is better. No documented setup difference

GPT-6 Astra80.0%

GPT-5.6 Luna81.7%

AA-OmniscienceOverall. Higher is better. No documented setup difference

GPT-6 Astra43.417 points

GPT-5.6 Luna-10.767 points

AA-Omniscience AccuracyOverall. Higher is better. No documented setup difference

GPT-6 Astra61.9%

GPT-5.6 Luna42.4%

AA-Omniscience Hallucination RateOverall. Lower is better. No documented setup difference

GPT-6 Astra48.3%

GPT-5.6 Luna92.5%

Artificial Analysis Intelligence IndexOverall. Higher is better. No documented setup difference

GPT-6 Astra52.386 points

GPT-5.6 Luna34.555 points

AutomationBench-AAOverall. Higher is better. No documented setup difference

GPT-6 Astra67.2%

GPT-5.6 Luna42.6%

BioMysteryBenchOverall. Higher is better. No documented setup difference

GPT-6 Astra79.259 %

GPT-5.6 Luna61.481 %

Code MigrationOverall. Higher is better. No documented setup difference

GPT-6 Astra67.74 %

GPT-5.6 Luna44.55 %

CyberBench v1.1Overall. Higher is better. No documented setup difference

GPT-6 Astra41.072 %

GPT-5.6 Luna73.631 %

EMBOverall. Higher is better. No documented setup difference

GPT-6 Astra71.7 %

GPT-5.6 Luna67.116 %

Finance Agent (v2)Overall. Higher is better. No documented setup difference

GPT-6 Astra53.54 %

GPT-5.6 Luna55.044 %

Key to the marks:better valuebetter, but not conclusivetie

Benchmark scores for GPT-6 Astra and GPT-5.6 Luna
Benchmark and task	GPT-6 Astra	GPT-5.6 Luna	Source
AA-BriefcaseOverall Test details No documented difference in the test setupVersion: v1.1Metric: AA-Briefcase EloScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	Winner1,546.7 elo	1,267.93 elo	Artificial Analysis Source details Data as of: 10/19/2026
AA-LCROverall Test details No documented difference in the test setupVersion: v1.1Metric: Pass rateScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	80.0%	Winner81.7%	Artificial Analysis Source details Data as of: 10/19/2026
AA-OmniscienceOverall Test details No documented difference in the test setupVersion: unspecifiedMetric: AA-Omniscience IndexScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	Winner43.417 points The index can be negative and ranges from -100 to 100 according to Artificial Analysis.	-10.767 points The index can be negative and ranges from -100 to 100 according to Artificial Analysis.	Artificial Analysis Source details Data as of: 10/19/2026
AA-Omniscience AccuracyOverall Test details No documented difference in the test setupVersion: AA Omniscience diagnosticMetric: AA-Omniscience AccuracyScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh, Attempts: AA-reported aggregate; diagnostic-specific run count is not stated on the leaderboard GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: Xhigh, Attempts: AA-reported aggregate; diagnostic-specific run count is not stated on the leaderboardGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption. Proportion of all questions answered correctly, regardless of whether the model answers or abstains on other questions.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption. Proportion of all questions answered correctly, regardless of whether the model answers or abstains on other questions.	Winner61.9% This is the separately published accuracy diagnostic, not the AA-Omniscience Index. AA identifies higher values as better.	42.4% This is the separately published accuracy diagnostic, not the AA-Omniscience Index. AA identifies higher values as better.	Artificial Analysis Source details Data as of: 10/19/2026
AA-Omniscience Hallucination RateOverall Test details No documented difference in the test setupVersion: AA Omniscience diagnosticMetric: AA-Omniscience Hallucination RateScoring: Lower is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh, Attempts: AA-reported aggregate; diagnostic-specific run count is not stated on the leaderboard GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: Xhigh, Attempts: AA-reported aggregate; diagnostic-specific run count is not stated on the leaderboardGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption. Proportion of incorrect answers among all non-correct responses: incorrect / (incorrect + partial answers + not attempted).GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption. Proportion of incorrect answers among all non-correct responses: incorrect / (incorrect + partial answers + not attempted).	Winner48.3% This is the separately published hallucination-rate diagnostic, not the AA-Omniscience Index. AA identifies lower values as better.	92.5% This is the separately published hallucination-rate diagnostic, not the AA-Omniscience Index. AA identifies lower values as better.	Artificial Analysis Source details Data as of: 10/19/2026
Artificial Analysis Intelligence IndexOverall Test details No documented difference in the test setupVersion: v4.3.2Metric: Artificial Analysis Intelligence IndexScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	Winner52.386 points	34.555 points	Artificial Analysis Source details Data as of: 10/19/2026
AutomationBench-AAOverall Test details No documented difference in the test setupVersion: unspecifiedMetric: Objectives completed without guardrail violationsScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	Winner67.2%	42.6%	Artificial Analysis Source details Data as of: 10/19/2026
BioMysteryBenchOverall Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Harness: Terminus 2, Output limit: 128,000 tokens	Winner79.259 %	61.481 %	Vals AI Source details Data as of: 10/12/2026
Code MigrationOverall Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner67.74 %	44.55 %	Vals AI Source details Data as of: 10/12/2026
CyberBench v1.1Overall Test details No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	41.072 %	Winner73.631 %	Vals AI Source details Data as of: 10/12/2026
EMBOverall Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner71.7 %	67.116 %	Vals AI Source details Data as of: 10/12/2026
Finance Agent (v2)Overall Test details No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	53.54 %	Winner55.044 %	Vals AI Source details Data as of: 10/12/2026
GDP.pdfOverall Test details No documented difference in the test setupVersion: unspecifiedMetric: All-pass rateScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	Winner32.2%	23.8%	Artificial Analysis Source details Data as of: 10/19/2026
GDPval-AAOverall Test details No documented difference in the test setupVersion: v2.1Metric: GDPval-AA EloScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	Winner1,555.91 elo	1,399.92 elo	Artificial Analysis Source details Data as of: 10/19/2026
Harvey's Legal Agent BenchmarkOverall · Task fully resolved Test details No documented difference in the test setupVersion: 1Metric: task resolution rateScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner5.417 %	1.25 %	Vals AI Source details Data as of: 10/12/2026
Humanity's Last ExamOverall Test details No documented difference in the test setupVersion: unspecifiedMetric: Text-only pass@1 accuracyScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	Winner54.6% Artificial Analysis describes this comparable run as 2,158 text-only questions, not the full 2,500-question dataset.	37.0% Artificial Analysis describes this comparable run as 2,158 text-only questions, not the full 2,500-question dataset.	Artificial Analysis Source details Data as of: 10/19/2026
IOIOverall Test details No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner100 %	61.778 %	Vals AI Source details Data as of: 10/14/2026
ITBench-AA (SRE)Overall Test details No documented difference in the test setupVersion: AA cohort: 59 tasksMetric: Average precision at full recallScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max, Agent: Stirrup agent, Harness: Artificial Analysis Stirrup, Attempts: Average precision at full recall, 3 repeats per task GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: Max, Agent: Stirrup agent, Harness: Artificial Analysis Stirrup, Attempts: Average precision at full recall, 3 repeats per taskGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. 59 Kubernetes incident tasks, 40 public and 19 private, with three repeats per task. A run scores zero if it misses any true root cause; otherwise it receives its precision at full recall. This is the SRE slice of ITBench.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. 59 Kubernetes incident tasks, 40 public and 19 private, with three repeats per task. A run scores zero if it misses any true root cause; otherwise it receives its precision at full recall. This is the SRE slice of ITBench.	Winner48.6% This AA implementation covers Site Reliability Engineering only, not ITBench's other CISO and FinOps domains.	40.3% This AA implementation covers Site Reliability Engineering only, not ITBench's other CISO and FinOps domains.	Artificial Analysis Source details Data as of: 10/19/2026
Legal Research BenchOverall · All-pass Test details No documented difference in the test setupVersion: 1Metric: all-pass rateScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner39.423 %	36.538 %	Vals AI Source details Data as of: 10/12/2026
LMArena Text, Style ControlOverall Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGPT-6 Astra: Snapshot: gpt-6-astra-max, Reasoning: max, Harness: Arena Text, style control GPT-5.6 Luna: Snapshot: gpt-5.6-luna-xhigh, Reasoning: xhigh, Harness: Arena Text, style controlGPT-6 Astra: Arena rating from 11,674 published pairwise votes.GPT-5.6 Luna: Arena rating from 41,103 published pairwise votes.	Higher measured value1,476.716 95% confidence interval: ±6.385The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,452.509 95% confidence interval: ±4.306The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlOverall Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGPT-6 Astra: Snapshot: gpt-6-astra-max, Reasoning: max, Harness: Arena Vision, style control GPT-5.6 Luna: Snapshot: gpt-5.6-luna-xhigh, Reasoning: xhigh, Harness: Arena Vision, style controlGPT-6 Astra: Arena rating from 3,590 published pairwise votes.GPT-5.6 Luna: Arena rating from 11,086 published pairwise votes.	Higher measured value1,285.988 95% confidence interval: ±10.782The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,257.662 95% confidence interval: ±7.463The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
MedCodeOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterGPT-6 Astra: Reasoning: max, Output limit: 128,000 tokens GPT-5.6 Luna: Reasoning: max, Output limit: 30,000 tokens	Higher measured value48.486 %	42.391 %	Vals AI Source details Data as of: 10/13/2026
MedScribeOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterGPT-6 Astra: Reasoning: max, Output limit: 128,000 tokens GPT-5.6 Luna: Reasoning: max, Output limit: 30,000 tokens	Higher measured value87.908 %	84.391 %	Vals AI Source details Data as of: 10/13/2026
MMMU-ProOverall Test details No documented difference in the test setupVersion: AA cohort: 1,730 questionsMetric: pass@1 accuracyScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh, Attempts: pass@1, one run per question GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: Xhigh, Attempts: pass@1, one run per questionGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption. The AA run covers 1,730 questions with ten answer options. Answers are extracted by regex and scored pass@1.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption. The AA run covers 1,730 questions with ten answer options. Answers are extracted by regex and scored pass@1.	Winner86.2% The benchmark page describes 3,460 questions in the full MMMU-Pro dataset; AA's methodology specifies a 1,730-question run.	78.6% The benchmark page describes 3,460 questions in the full MMMU-Pro dataset; AA's methodology specifies a 1,730-question run.	Artificial Analysis Source details Data as of: 10/19/2026
MysteryMechanismOverall Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner53.153 %	14.414 %	Vals AI Source details Data as of: 10/12/2026
ProgramBenchOverall Test details No documented difference in the test setupVersion: 1Metric: fully resolved rateScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner5.5 %	0 %	Vals AI Source details Data as of: 10/12/2026
ProofBenchOverall Test details No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner99 %	60 %	Vals AI Source details Data as of: 10/12/2026
SAGEOverall Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 30,000 tokens	Winner46.367 %	44.22 %	Vals AI Source details Data as of: 10/08/2026
SRE BenchOverall Test details No documented difference in the test setupVersion: 1Metric: fully solved rateScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner56.87 %	1.527 %	Vals AI Source details Data as of: 10/14/2026
Tax Agent BenchOverall Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	20.717 %	Winner24.815 %	Vals AI Source details Data as of: 10/12/2026
Terminal-BenchOverall Test details No documented difference in the test setupVersion: 4.0Metric: Task successScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Xhigh), Reasoning: Xhigh GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Xhigh), Reasoning: XhighGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Xhigh) (release gpt-6-astra, row gpt-6-astra-xhigh, UUID 1f541ef3-913f-4eb2-9d07-0e93c7a9a5e3, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Xhigh) (release gpt-5-6-luna, row gpt-5-6-luna-xhigh, UUID 87110ff0-1f79-41b4-9976-eda250597317, reasoning=true, source reasoning-token configuration budget=0, suffix=Xhigh). This configured value is not measured token consumption.	Winner59.6%	3.5%	Artificial Analysis Source details Data as of: 10/19/2026
Terminal-Bench 2.1Overall Test details No documented difference in the test setupVersion: 2.1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner87.266 %	79.026 %	Vals AI Source details Data as of: 09/28/2026
Terminal-Bench 4.0Overall Test details No documented difference in the test setupVersion: 4.0Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner59.596 %	11.616 %	Vals AI Source details Data as of: 10/13/2026
Terminal-Bench ScienceOverall Test details No documented difference in the test setupVersion: 0.1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Harness: Mini-SWE-agent, Output limit: 128,000 tokens	Winner62.857 %	0 %	Vals AI Source details Data as of: 10/14/2026
Terminal-Bench-ScienceOverall Test details No documented difference in the test setupVersion: 0.1.0Metric: pass@1 task success rateScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max, Agent: mini-swe-agent, Harness: mini-swe-agent, Attempts: pass@1, averaged over 3 repeats per task GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: Max, Agent: mini-swe-agent, Harness: mini-swe-agent, Attempts: pass@1, averaged over 3 repeats per taskGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. The full 0.1.0 release has 70 tasks across five scientific domains. A task passes only when its entire test suite passes. AA averages pass@1 over three repeats.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. The full 0.1.0 release has 70 tasks across five scientific domains. A task passes only when its entire test suite passes. AA averages pass@1 over three repeats.	Winner63.3%	3.3%	Artificial Analysis Source details Data as of: 10/19/2026
Vals IndexOverall Test details No documented difference in the test setupVersion: 2.1Metric: weighted index scoreScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner63.125 %	51.687 %	Vals AI Source details Data as of: 10/13/2026
Vibe Code Bench 1-100Overall Test details No documented difference in the test setupVersion: 1.0Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Harness: OpenHands, Output limit: 128,000 tokens	Winner27.644 %	22.594 %	Vals AI Source details Data as of: 10/14/2026
Vibe Code Bench v1.1Overall Test details No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Harness: OpenHands, Output limit: 128,000 tokens	Winner89.594 %	77.055 %	Vals AI Source details Data as of: 10/12/2026
AA-BriefcaseOverall Test details No documented difference in the test setupVersion: v1.1Metric: AA-Briefcase EloScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	Winner1,568.99 elo	1,342.18 elo	Artificial Analysis Source details Data as of: 10/19/2026
AA-LCROverall Test details No documented difference in the test setupVersion: v1.1Metric: Pass rateScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	80.7%	Winner83.7%	Artificial Analysis Source details Data as of: 10/19/2026
AA-OmniscienceOverall Test details No documented difference in the test setupVersion: unspecifiedMetric: AA-Omniscience IndexScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	Winner43.4 points The index can be negative and ranges from -100 to 100 according to Artificial Analysis.	-10.283 points The index can be negative and ranges from -100 to 100 according to Artificial Analysis.	Artificial Analysis Source details Data as of: 10/19/2026
AA-Omniscience AccuracyOverall Test details No documented difference in the test setupVersion: AA Omniscience diagnosticMetric: AA-Omniscience AccuracyScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max, Attempts: AA-reported aggregate; diagnostic-specific run count is not stated on the leaderboard GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: Max, Attempts: AA-reported aggregate; diagnostic-specific run count is not stated on the leaderboardGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. Proportion of all questions answered correctly, regardless of whether the model answers or abstains on other questions.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. Proportion of all questions answered correctly, regardless of whether the model answers or abstains on other questions.	Winner62.6% This is the separately published accuracy diagnostic, not the AA-Omniscience Index. AA identifies higher values as better.	42.7% This is the separately published accuracy diagnostic, not the AA-Omniscience Index. AA identifies higher values as better.	Artificial Analysis Source details Data as of: 10/19/2026
AA-Omniscience Hallucination RateOverall Test details No documented difference in the test setupVersion: AA Omniscience diagnosticMetric: AA-Omniscience Hallucination RateScoring: Lower is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max, Attempts: AA-reported aggregate; diagnostic-specific run count is not stated on the leaderboard GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: Max, Attempts: AA-reported aggregate; diagnostic-specific run count is not stated on the leaderboardGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. Proportion of incorrect answers among all non-correct responses: incorrect / (incorrect + partial answers + not attempted).GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. Proportion of incorrect answers among all non-correct responses: incorrect / (incorrect + partial answers + not attempted).	Winner51.3% This is the separately published hallucination-rate diagnostic, not the AA-Omniscience Index. AA identifies lower values as better.	92.6% This is the separately published hallucination-rate diagnostic, not the AA-Omniscience Index. AA identifies lower values as better.	Artificial Analysis Source details Data as of: 10/19/2026
Artificial Analysis Intelligence IndexOverall Test details No documented difference in the test setupVersion: v4.3.2Metric: Artificial Analysis Intelligence IndexScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	Winner52.674 points	37.324 points	Artificial Analysis Source details Data as of: 10/19/2026
AutomationBench-AAOverall Test details No documented difference in the test setupVersion: unspecifiedMetric: Objectives completed without guardrail violationsScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	Winner68.5%	50.2%	Artificial Analysis Source details Data as of: 10/19/2026
BioMysteryBenchHard Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Harness: Terminus 2, Output limit: 128,000 tokens	Winner37.255 %	27.451 %	Vals AI Source details Data as of: 10/12/2026
Code MigrationCLI Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner67.463 %	36.067 %	Vals AI Source details Data as of: 10/12/2026
CyberBench v1.1Patch Test details No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	82.143 %	Winner83.929 %	Vals AI Source details Data as of: 10/12/2026
EMBComps Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner77.953 %	54.573 %	Vals AI Source details Data as of: 10/12/2026
Finance Agent (v2)Adjustments Test details No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	48.318 %	Winner52.027 %	Vals AI Source details Data as of: 10/12/2026
GDP.pdfOverall Test details No documented difference in the test setupVersion: unspecifiedMetric: All-pass rateScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	Winner31.0%	24.0%	Artificial Analysis Source details Data as of: 10/19/2026
GDPval-AAOverall Test details No documented difference in the test setupVersion: v2.1Metric: GDPval-AA EloScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	Winner1,572.84 elo	1,459.2 elo	Artificial Analysis Source details Data as of: 10/19/2026
Harvey's Legal Agent BenchmarkAntitrust Competition · Criteria passed Test details No documented difference in the test setupVersion: 1Metric: criteria pass rateScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner88.768 %	85.145 %	Vals AI Source details Data as of: 10/12/2026
Humanity's Last ExamOverall Test details No documented difference in the test setupVersion: unspecifiedMetric: Text-only pass@1 accuracyScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	Winner54.7% Artificial Analysis describes this comparable run as 2,158 text-only questions, not the full 2,500-question dataset.	39.5% Artificial Analysis describes this comparable run as 2,158 text-only questions, not the full 2,500-question dataset.	Artificial Analysis Source details Data as of: 10/19/2026
IOIIOI 2024 Test details No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner100 %	85 %	Vals AI Source details Data as of: 10/14/2026
Legal Research BenchAdministrative / Regulatory · All-pass Test details No documented difference in the test setupVersion: 1Metric: all-pass rateScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner53.03 %	48.485 %	Vals AI Source details Data as of: 10/12/2026
LMArena Text, Style ControlBusiness, management and finance Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGPT-6 Astra: Snapshot: gpt-6-astra-max, Reasoning: max, Harness: Arena Text, style control GPT-5.6 Luna: Snapshot: gpt-5.6-luna-xhigh, Reasoning: xhigh, Harness: Arena Text, style controlGPT-6 Astra: Arena rating from 2,061 published pairwise votes.GPT-5.6 Luna: Arena rating from 7,709 published pairwise votes.	Higher measured value1,472.34 95% confidence interval: ±13.336The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,461.658 95% confidence interval: ±7.593The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/13/2026
LMArena Vision, Style ControlChinese Test details Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGPT-6 Astra: Snapshot: gpt-6-astra-max, Reasoning: max, Harness: Arena Vision, style control GPT-5.6 Luna: Snapshot: gpt-5.6-luna-xhigh, Reasoning: xhigh, Harness: Arena Vision, style controlGPT-6 Astra: Arena rating from 230 published pairwise votes.GPT-5.6 Luna: Arena rating from 633 published pairwise votes.	Higher measured value1,357.126 95% confidence interval: ±39.572The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	1,278.602 95% confidence interval: ±24.931The Arena score measures human preference rather than a fixed capability test. The confidence interval, Arena category, and model configuration are part of the result.	LMArena Source details Data as of: 10/09/2026
MMMU-ProOverall Test details No documented difference in the test setupVersion: AA cohort: 1,730 questionsMetric: pass@1 accuracyScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max, Attempts: pass@1, one run per question GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: Max, Attempts: pass@1, one run per questionGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. The AA run covers 1,730 questions with ten answer options. Answers are extracted by regex and scored pass@1.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption. The AA run covers 1,730 questions with ten answer options. Answers are extracted by regex and scored pass@1.	Winner86.9% The benchmark page describes 3,460 questions in the full MMMU-Pro dataset; AA's methodology specifies a 1,730-question run.	78.6% The benchmark page describes 3,460 questions in the full MMMU-Pro dataset; AA's methodology specifies a 1,730-question run.	Artificial Analysis Source details Data as of: 10/19/2026
ProgramBenchAlmost Resolved Test details No documented difference in the test setupVersion: 1Metric: almost-resolved rateScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner50 %	9 %	Vals AI Source details Data as of: 10/12/2026
SAGEAutomata Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 30,000 tokens	Winner37.302 %	31.35 %	Vals AI Source details Data as of: 10/08/2026
SRE BenchCapability Score Test details No documented difference in the test setupVersion: 1Metric: capability scoreScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner63.868 %	6.361 %	Vals AI Source details Data as of: 10/14/2026
Tax Agent BenchControversy & Precedence Analysis Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Reasoning: max, Output limit: 128,000 tokens	Winner13.333 %	10 %	Vals AI Source details Data as of: 10/12/2026
Terminal-BenchOverall Test details No documented difference in the test setupVersion: 4.0Metric: Task successScoring: Higher is betterGPT-6 Astra: Snapshot: GPT-6 Astra (Max), Reasoning: Max GPT-5.6 Luna: Snapshot: GPT-5.6 Luna (Max), Reasoning: MaxGPT-6 Astra: Exact AA configuration: GPT-6 Astra (Max) (release gpt-6-astra, row gpt-6-astra, UUID 2f339a97-9a0d-499a-9cb5-e0db665bfa25, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.GPT-5.6 Luna: Exact AA configuration: GPT-5.6 Luna (Max) (release gpt-5-6-luna, row gpt-5-6-luna, UUID 426d24c8-49ae-482a-b4a8-20f1c53f21c1, reasoning=true, source reasoning-token configuration budget=0, suffix=Max). This configured value is not measured token consumption.	Winner59.1%	11.6%	Artificial Analysis Source details Data as of: 10/19/2026
Key to the marks:better valuebetter, but not conclusivetie

Our model tests

Our tests

SVG short test

One SVG prompt and fixed output settings. Captures are shown only with 0 reported reasoning tokens or documented lack of reasoning controls. Identical test conditions do not make the models' internal compute identical.

Shared test round: 4ae5d8eeb9a9

GPT-6 Astra

Unavailable in this round

GPT-5.6 Luna

Unavailable in this round

Earlier tests

Pelican on a bicycle

A community classic for free-form SVG drawing.

GPT-6 Astra

Reasoning (requested): high

Current attempt

Run date: Sep 7, 2026
API provider: openrouter
Requested API model: openai/gpt-6-astra
API model reported in response: openai/gpt-6-astra
Reasoning setting: high
Pinned endpoint: OpenAI | openai/gpt-6-astra-20260903
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Passed, not a quality rating
Response time: 141.7 s

Visually reviewed. This individual test does not establish overall model quality.

GPT-5.6 Luna

Reasoning (requested): high

Current attempt

Run date: Sep 7, 2026
API provider: openrouter
Requested API model: openai/gpt-5.6-luna
API model reported in response: openai/gpt-5.6-luna
Reasoning setting: high
Pinned endpoint: OpenAI | openai/gpt-5.6-luna-20260709
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Passed, not a quality rating
Response time: 49.9 s

Visually reviewed. This individual test does not establish overall model quality.

Prompt and test conditions

Generate an SVG of a pelican riding a bicycle

Token limit including reasoning: 8,192 tokens

Task origin (Simon Willison)

How to read this comparison

Winning one benchmark is not an overall verdict

Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.

The standard price table uses direct developer rates. The provider comparison labels OpenRouter endpoints, regions, and special tariffs separately.

Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.

More matchups

Compare GPT-6 Astra and GPT-5.6 Luna with other leading models using the same data and benchmark logic.

View the complete LLM comparison

GPT-6 Astra vs. GPT-5.6 Luna

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General specifications

API pricing compared

Shared benchmarks

Capability profile from matched benchmarks

Our tests

SVG short test

GPT-6 Astra

GPT-5.6 Luna

Pelican on a bicycle

Winning one benchmark is not an overall verdict

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