HEAD TO HEAD
Make the
right call.
Pick two to four models. Compare category evidence, price, context, speed and capabilities side by side.
Sign in to save this comparison →01 / SCORECARD
Coding focus · side by side
| Metric | Claude Sonnet 5.5 | GPT-6 Astra |
|---|---|---|
| Quantum Score | 88QUANTUM SCORE | 60QUANTUM SCORE |
| Confidence / coverage | Moderate confidence · 73% · 2 independent domains | Moderate confidence · 73% · 4 independent domains |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Modalities / tools | text, image · tool use, vision | text, image · tool use, vision |
| Coding | 100 | 63 -37 vs first |
| Reasoning | 100 | 98 -2 vs first |
| Math | 84 | 87 +3 vs first |
| Research | — | — |
| Agents | 80 | 20 -60 vs first |
| Multimodal | — | — |
| Speed | — | — |
| Value | 65 | 22 -43 vs first |
| Input / 1M | $2.00 | $10.00 |
| Output / 1M | $10.00 | $50.00 |
| Measured output speed | — | 55 tokens/s · Max effort |
02 / EVIDENCE
Published benchmark evidence
| Benchmark | Claude Sonnet 5.5 | GPT-6 Astra |
|---|---|---|
| Terminal-Bench 4.0 Vals mini-SWE-agent avg@3 fallbacks failed · 4.0 · Vals mini-SWE-agent avg@3; Anthropic fallbacks treated as failures | 62.63 % independent lab ↗ | 59.6 % independent lab ↗ |
| LiveBench code_completion · 2026-06-25 · Public table; published model effort variant | 86.957 % benchmark maintainer ↗ | 80.435 % benchmark maintainer ↗ |
| LiveBench code_generation · 2026-06-25 · Public table; published model effort variant | 95.775 % benchmark maintainer ↗ | 80.282 % benchmark maintainer ↗ |
| LiveBench javascript · 2026-06-25 · Public table; published model effort variant | 77.273 % benchmark maintainer ↗ | 63.636 % benchmark maintainer ↗ |
| LiveBench AMPS_Hard · 2026-06-25 · Public table; published model effort variant | 98 % benchmark maintainer ↗ | 98 % benchmark maintainer ↗ |
| LiveBench olympiad · 2026-06-25 · Public table; published model effort variant | 92.468 % benchmark maintainer ↗ | 92.166 % benchmark maintainer ↗ |
| LiveBench theory_of_mind · 2026-06-25 · Public table; published model effort variant | 86.538 % benchmark maintainer ↗ | 84.615 % benchmark maintainer ↗ |
| LiveBench zebra_puzzle · 2026-06-25 · Public table; published model effort variant | 100 % benchmark maintainer ↗ | 100 % benchmark maintainer ↗ |
AS THE EVIDENCE CHANGED
Comparison history
Dated releases, price events, and benchmark publications. A price or test change can alter the factual comparison; this timeline does not pick a winner.
2026-09-28 · Claude Sonnet 5.5 released ↗ · source
2026-09-03 · GPT-6 Astra released ↗ · source
2026-09-30 verified (test date not published) · gpt-6-astra entered LiveBench code_completion (2026-06-25) at 80.435 % · source ↗
2026-09-30 verified (test date not published) · gpt-6-astra entered LiveBench code_generation (2026-06-25) at 80.282 % · source ↗
2026-09-30 verified (test date not published) · gpt-6-astra entered LiveBench javascript (2026-06-25) at 63.636 % · source ↗
2026-09-30 verified (test date not published) · gpt-6-astra entered LiveBench AMPS_Hard (2026-06-25) at 98 % · source ↗
2026-09-30 verified (test date not published) · gpt-6-astra entered LiveBench olympiad (2026-06-25) at 92.166 % · source ↗
2026-09-30 verified (test date not published) · gpt-6-astra entered LiveBench theory_of_mind (2026-06-25) at 84.615 % · source ↗
2026-09-30 verified (test date not published) · gpt-6-astra entered LiveBench zebra_puzzle (2026-06-25) at 100 % · source ↗
2026-09-30 verified (test date not published) · claude-sonnet-5-5 entered LiveBench code_completion (2026-06-25) at 86.957 % · source ↗
2026-09-30 verified (test date not published) · claude-sonnet-5-5 entered LiveBench code_generation (2026-06-25) at 95.775 % · source ↗
2026-09-30 verified (test date not published) · claude-sonnet-5-5 entered LiveBench javascript (2026-06-25) at 77.273 % · source ↗
2026-09-30 verified (test date not published) · claude-sonnet-5-5 entered LiveBench AMPS_Hard (2026-06-25) at 98 % · source ↗
2026-09-30 verified (test date not published) · claude-sonnet-5-5 entered LiveBench olympiad (2026-06-25) at 92.468 % · source ↗
An overall score appears only after enough current, comparable, independently sourced results exist. Pricing and individual benchmark results remain visible meanwhile.