Head-to-head comparison
Claude Sonnet 5 vs. GPT-6 Astra
Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.
- shared result series
- 11
- distinct benchmarks
- 11
- latest retrieval
- 2026-09-04
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Specifications
General specifications
Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.
| Attribute | Claude Sonnet 5 | GPT-6 Astra |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Released | Jun 30, 2026 | Sep 3, 2026 |
| Availability | Active | Limited access |
| Model type | Proprietary | Proprietary |
| Parameters | Not published | Not published |
| Architecture | Not published | Not published |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Knowledge cutoff | January 2026 | April 30, 2026 |
| Technical sources | Model, Context | Model, Context |
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.
| Price type | Claude Sonnet 5 | GPT-6 Astra |
|---|---|---|
| API input | $2 | $10 ≤272K / $20 >272K |
| API output | $10 | $50 ≤272K / $75 >272K |
| Cache read | $0.2 | $1 ≤272K / $2 >272K |
| Cache write (5 min.) | $2.5 | $12.5 ≤272K / $25 >272K |
| Cache write (1 hr.) | $4 | Not listed |
| Price verified | 09/02/2026 Source | 09/04/2026 Source |
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.
No provider tariff for GPT-6 Astra is available in the stored OpenRouter snapshot. The official direct price is still shown.
| Model | Provider | Purchase route and tariff | Input per 1M tokens | Output per 1M tokens | Source |
|---|---|---|---|---|---|
| Claude Sonnet 5 | Anthropic | Direct from developerStandard API | Lowest listed price: $2 | Lowest listed price: $10 | Source09/02/2026 |
| Amazon Bedrock | Via OpenRouteramazon-bedrock/global | Lowest listed price: $2 | Lowest listed price: $10 | Source09/04/2026 | |
| Amazon Bedrock | Via OpenRouteramazon-bedrock/us-east-1 | $2.2 | $11 | Source09/04/2026 | |
| Anthropic | Via OpenRouteranthropic | Lowest listed price: $2 | Lowest listed price: $10 | Source09/04/2026 | |
| Azure | Via OpenRouterazure/global | Lowest listed price: $2 | Lowest listed price: $10 | Source09/04/2026 | |
| Azure | Via OpenRouterazure/us | Lowest listed price: $2 | Lowest listed price: $10 | Source09/04/2026 | |
| Claude Platform on AWS | Via OpenRouterclaude-on-aws | Lowest listed price: $2 | Lowest listed price: $10 | Source09/04/2026 | |
| Via OpenRoutergoogle-vertex/europe | $2.2 | $11 | Source09/04/2026 | ||
| Via OpenRoutergoogle-vertex/global | Lowest listed price: $2 | Lowest listed price: $10 | Source09/04/2026 | ||
| Via OpenRoutergoogle-vertex/us | $2.2 | $11 | Source09/04/2026 | ||
| GPT-6 Astra | OpenAI | Direct from developerUp to 272,000 context tokens | Lowest listed price: $10 | Lowest listed price: $50 | Source09/04/2026 |
| OpenAI | Direct from developerAbove 272,000 context tokens | $20 | $75 | Source09/04/2026 |
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.
11 matched rows from 11 benchmark families were considered. The radar shows 7 of 7 comparable categories.
Key to the marks:better valuebetter, but not conclusivetie
| Benchmark and task | Claude Sonnet 5 | GPT-6 Astra | Source |
|---|---|---|---|
Code MigrationOverallTest detailsNo documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better | 44.392 % | Winner67.74 % | Vals AISource detailsData as of: 09/03/2026 |
EMBOverallTest detailsNo documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better | 66.316 % | Winner71.7 % | Vals AISource detailsData as of: 09/03/2026 |
Finance Agent (v2)OverallTest detailsNo documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better | Winner53.909 % | 53.54 % | Vals AISource detailsData as of: 09/03/2026 |
Harvey's Legal Agent BenchmarkOverall · Task fully resolvedTest detailsNo documented difference in the test setupVersion: 1Metric: task resolution rateScoring: Higher is better | 5 % | Winner5.417 % | Vals AISource detailsData as of: 09/03/2026 |
Legal Research BenchOverall · All-passTest detailsNo documented difference in the test setupVersion: 1Metric: all-pass rateScoring: Higher is better | Winner41.827 % | 39.423 % | Vals AISource detailsData as of: 09/03/2026 |
MedCodeOverallTest detailsNo documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better | 47.54 % | Winner48.486 % | Vals AISource detailsData as of: 09/03/2026 |
MedScribeOverallTest detailsNo documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better | 76.054 % | Winner87.908 % | Vals AISource detailsData as of: 09/03/2026 |
SAGEOverallTest detailsNo documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better | Winner48.925 % | 46.367 % | Vals AISource detailsData as of: 09/03/2026 |
Terminal-Bench 2.1OverallTest detailsNo documented difference in the test setupVersion: 2.1Metric: accuracyScoring: Higher is better | 74.532 % | Winner87.266 % | Vals AISource detailsData as of: 09/03/2026 |
Vals IndexOverallTest detailsNo documented difference in the test setupVersion: 2Metric: weighted index scoreScoring: Higher is better | 59.61 % | Winner66.608 % | Vals AISource detailsData as of: 09/03/2026 |
Vibe Code Bench v1.1OverallTest detailsNo documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is betterSettings: Harness: OpenHands | 81.325 % | Winner89.594 % | Vals AISource detailsData as of: 09/03/2026 |
Key to the marks:better valuebetter, but not conclusivetie | |||
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.
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