Head-to-head comparison

Claude Opus 4.5 vs. Gemini 3.8 Flash

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

shared result series: 42
distinct benchmark metrics: 10
latest retrieval: 2026-10-16

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 Claude Opus 4.5 and Gemini 3.8 Flash
Attribute	Claude Opus 4.5	Gemini 3.8 Flash
Provider	Anthropic	Google
Released	Nov 2025	Sep 2, 2026
Availability	Active	Active
Model type	Proprietary	Proprietary
Parameters	Not published	Not published
Architecture	Not published	Not published
Context window	200,000 tokens	1,048,576 tokens
Knowledge cutoff	May 2025	March 2026
Technical sources	Model, Context	Model, 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 Claude Opus 4.5 and Gemini 3.8 Flash
Price type	Claude Opus 4.5	Gemini 3.8 Flash
API input	$5	$0.75
API output	$25	$3.75
Cache read	$0.5	$0.075
Cache write (5 min.)	$6.25	Not listed
Cache write (1 hr.)	$10	Not listed
Price verified	09/22/2026 Source	09/22/2026 Source

Claude Opus 4.5Gemini 3.8 Flash

API inputUSD per 1M tokens, base tier

Claude Opus 4.5$5

Gemini 3.8 Flash$0.75

API outputUSD per 1M tokens, base tier

Claude Opus 4.5$25

Gemini 3.8 Flash$3.75

Cache readUSD per 1M tokens, base tier

Claude Opus 4.5$0.5

Gemini 3.8 Flash$0.075

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 Claude Opus 4.5 and Gemini 3.8 Flash
Model	Provider	Purchase route and tariff	Input per 1M tokens	Output per 1M tokens	Source
Claude Opus 4.5	Anthropic	Direct from developerStandard API	Lowest listed price: $5	Lowest listed price: $25	Source09/22/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock/eu-west-1	$5.5	$27.5	Source10/26/2026
	Anthropic	Via OpenRouteranthropic	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Azure	Via OpenRouterazure/global	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Claude Platform on AWS	Via OpenRouterclaude-on-aws	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Google	Via OpenRoutergoogle-vertex/global	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
Gemini 3.8 Flash	Google	Direct from developerStandard API	$0.75	$3.75	Source09/22/2026
	Google	Via OpenRoutergoogle-vertex/global	$0.75	$3.75	Source10/26/2026
	Google	Via OpenRoutergoogle-vertex/global/priority	$1.35	$6.75	Source10/26/2026
	Google AI Studio	Via OpenRoutergoogle-ai-studio	$0.75	$3.75	Source10/26/2026
	Google AI Studio	Via OpenRoutergoogle-ai-studio/flex	Lowest listed price: $0.375	Lowest listed price: $1.875	Source10/26/2026
	Google AI Studio	Via OpenRoutergoogle-ai-studio/priority	$1.35	$6.75	Source10/26/2026

Benchmark index

Benchmark index compared

The index combines independent benchmarks on a scale from 0 to 100. A lead only counts when a model comes first in at least 95% of 200 recalculations with randomly redrawn test families. Otherwise both count as level.

Open the AI leaderboard

Claude Opus 4.5

Overall index

12.1

Gemini 3.8 Flash

Overall index

66.9

Gemini 3.8 Flash leads in 8 of 9 shared areas. One area is tied.

Area	Claude Opus 4.5	Gemini 3.8 Flash
Coding	8.1	53.1
Reasoning	7.0	74.6
Knowledge	10.8	77.6
Agents	12.3	64.6
Finance	19.8	72.4
Legal	15.3	70.3
Health	19.6	56.8
Multimodal	10.4	77.4
Educationtied	17.1	39.8

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.

Not enough directly matched categories for a reliable radar

Only 0 of at least 5 categories have comparable, direct model measurements. The benchmark tables below show the available evidence without filling missing axes.

Claude Opus 4.5Gemini 3.8 Flash

GPQA DiamondOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.579.546 %

Gemini 3.8 Flash94.444 %

LegalBenchOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.582.837 %

Gemini 3.8 Flash86.993 %

LiveCodeBench v6Overall. Higher is better. Test setup not documented as identical

Claude Opus 4.575.034 %

Gemini 3.8 Flash89.484 %

MedCodeOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.545.174 %

Gemini 3.8 Flash48.135 %

MedScribeOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.583.246 %

Gemini 3.8 Flash84.496 %

MMLU-ProOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.585.59 %

Gemini 3.8 Flash90.221 %

MMMU-ProOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.581.098 %

Gemini 3.8 Flash89.075 %

MortgageTaxOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.568.68 %

Gemini 3.8 Flash65.342 %

SAGEOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.545.002 %

Gemini 3.8 Flash35.064 %

TaxEval v2Overall. Higher is better. Test setup not documented as identical

Claude Opus 4.574.325 %

Gemini 3.8 Flash74.448 %

GPQA DiamondFew-Shot CoT. Higher is better. Test setup not documented as identical

Claude Opus 4.579.293 %

Gemini 3.8 Flash94.949 %

LegalBenchConclusion Tasks. Higher is better. Test setup not documented as identical

Claude Opus 4.587.7 %

Gemini 3.8 Flash90.691 %

Key to the marks:better valuebetter, but not conclusivetie

Benchmark scores for Claude Opus 4.5 and Gemini 3.8 Flash
Benchmark and task	Claude Opus 4.5	Gemini 3.8 Flash	Source
GPQA DiamondOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	79.546 %	Higher measured value94.444 %	Vals AI Source details Data as of: 09/01/2026
LegalBenchOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	82.837 %	Higher measured value86.993 %	Vals AI Source details Data as of: 10/13/2026
LiveCodeBench v6Overall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	75.034 %	Higher measured value89.484 %	Vals AI Source details Data as of: 09/01/2026
MedCodeOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	45.174 %	Higher measured value48.135 %	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 betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	83.246 %	Higher measured value84.496 %	Vals AI Source details Data as of: 10/13/2026
MMLU-ProOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	85.59 %	Higher measured value90.221 %	Vals AI Source details Data as of: 09/01/2026
MMMU-ProOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	81.098 %	Higher measured value89.075 %	Vals AI Source details Data as of: 09/01/2026
MortgageTaxOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	Higher measured value68.68 %	65.342 %	Vals AI Source details Data as of: 09/01/2026
SAGEOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 30,000 tokens	Higher measured value45.002 %	35.064 %	Vals AI Source details Data as of: 10/08/2026
TaxEval v2Overall Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	74.325 %	Higher measured value74.448 %	Vals AI Source details Data as of: 09/01/2026
GPQA DiamondFew-Shot CoT Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	79.293 %	Higher measured value94.949 %	Vals AI Source details Data as of: 09/01/2026
LegalBenchConclusion Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	87.7 %	Higher measured value90.691 %	Vals AI Source details Data as of: 10/13/2026
LiveCodeBench v6Easy Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	No direct winner99.068 %	No direct winner99.068 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProBiology Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	94.003 %	Higher measured value94.979 %	Vals AI Source details Data as of: 09/01/2026
MortgageTaxNumerical Extraction Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	Higher measured value77.424 %	70.588 %	Vals AI Source details Data as of: 09/01/2026
SAGEAutomata Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 30,000 tokens	29.365 %	Higher measured value33.334 %	Vals AI Source details Data as of: 10/08/2026
TaxEval v2Correctness Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	Higher measured value63.123 %	62.469 %	Vals AI Source details Data as of: 09/01/2026
GPQA DiamondZero-Shot CoT Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	79.798 %	Higher measured value93.939 %	Vals AI Source details Data as of: 09/01/2026
LegalBenchInterpretation Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	82.235 %	Higher measured value84.589 %	Vals AI Source details Data as of: 10/13/2026
LiveCodeBench v6Hard Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	44.571 %	Higher measured value78 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProBusiness Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	80.862 %	Higher measured value93.79 %	Vals AI Source details Data as of: 09/01/2026
MortgageTaxSemantic Extraction Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	59.936 %	Higher measured value60.095 %	Vals AI Source details Data as of: 09/01/2026
SAGECalculus Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Temperature: 1, Output limit: 30,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 30,000 tokens	58.333 %	Higher measured value79.63 %	Vals AI Source details Data as of: 10/08/2026
TaxEval v2Stepwise Reasoning Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	85.527 %	Higher measured value86.427 %	Vals AI Source details Data as of: 09/01/2026
LegalBenchIssue Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	84.152 %	Higher measured value91.278 %	Vals AI Source details Data as of: 10/13/2026
LiveCodeBench v6Medium Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	81.462 %	Higher measured value91.384 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProChemistry Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	89.488 %	Higher measured value92.491 %	Vals AI Source details Data as of: 09/01/2026
SAGELinear Algebra Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 30,000 tokens	Higher measured value64.372 %	41.7 %	Vals AI Source details Data as of: 10/08/2026
LegalBenchRhetoric Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	79.777 %	Higher measured value81.333 %	Vals AI Source details Data as of: 10/13/2026
MMLU-ProComputer Science Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	84.146 %	Higher measured value92.683 %	Vals AI Source details Data as of: 09/01/2026
SAGEPartial Differential Equations Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 30,000 tokens	Higher measured value41.27 %	30.159 %	Vals AI Source details Data as of: 10/08/2026
LegalBenchRule Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	80.32 %	Higher measured value87.076 %	Vals AI Source details Data as of: 10/13/2026
MMLU-ProEconomics Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	89.573 %	Higher measured value92.062 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProEngineering Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	76.161 %	Higher measured value88.751 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProHealth Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	83.985 %	Higher measured value84.474 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProHistory Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	78.478 %	Higher measured value83.727 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProLaw Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	78.292 %	Higher measured value82.016 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProMath Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	92.302 %	Higher measured value96.151 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProOthers Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	84.632 %	Higher measured value87.554 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProPhilosophy Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	87.776 %	Higher measured value88.176 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProPhysics Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	89.838 %	Higher measured value94.765 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProPsychology Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Gemini 3.8 Flash: Reasoning: high, Temperature: 1, Output limit: 65,536 tokens	88.722 %	Higher measured value91.479 %	Vals AI Source details Data as of: 09/01/2026
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: 43b8c5c46830

Claude Opus 4.5

Unavailable in this round

Gemini 3.8 Flash

Unavailable in this round

Earlier tests

Pelican on a bicycle

A community classic for free-form SVG drawing.

Claude Opus 4.5

Reasoning (requested): high

Current attempt

Run date: Oct 1, 2026
API provider: openrouter
Requested API model: anthropic/claude-opus-4.5
API model reported in response: anthropic/claude-opus-4.5
Reasoning setting: high
Pinned endpoint: Anthropic | anthropic/claude-4.5-opus-20251124
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: 21.6 s

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

Gemini 3.8 Flash

The response reached the token limit. No complete recording is available.

Reasoning (requested): high

Current attempt

Run date: Oct 5, 2026
API provider: openrouter
Requested API model: google/gemini-3.8-flash
API model reported in response: google/gemini-3.8-flash
Reasoning setting: high
Pinned endpoint: Google AI Studio | google/gemini-3.8-flash-20260902
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Failed
Response time: 40.2 s

Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.

Earlier attempts (3)

Oct 2, 2026API request failedReasoning setting: high
Oct 1, 2026API request failedReasoning setting: high
Sep 7, 2026API request failedReasoning setting: high

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 Claude Opus 4.5 and Gemini 3.8 Flash with other leading models using the same data and benchmark logic.

View the complete LLM comparison

Claude Opus 4.5 vs. Gemini 3.8 Flash

Change model selection

General specifications

API pricing compared

Benchmark index compared

Shared benchmarks

Capability profile from matched benchmarks

Our tests

SVG short test

Claude Opus 4.5

Gemini 3.8 Flash

Pelican on a bicycle

Winning one benchmark is not an overall verdict

Related LLM comparisons