HEAD TO HEAD
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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 Opus 5.5 | GPT-6 Astra |
|---|---|---|
| Quantum Score | 86QUANTUM SCORE | 60QUANTUM SCORE |
| Confidence / coverage | Moderate confidence · 73% · 3 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 | 87 | 63 -24 vs first |
| Reasoning | 97 | 98 +1 vs first |
| Math | 92 | 87 -5 vs first |
| Research | — | — |
| Agents | 100 | 20 -80 vs first |
| Multimodal | — | — |
| Speed | — | — |
| Value | 52 | 22 -30 vs first |
| Input / 1M | $4.00 | $10.00 |
| Output / 1M | $20.00 | $50.00 |
| Measured output speed | 92 tokens/s · Max effort | 55 tokens/s · Max effort |
02 / EVIDENCE
Published benchmark evidence
| Benchmark | Claude Opus 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 | 58.08 % independent lab ↗ | 59.6 % independent lab ↗ |
| ProofBench v1.1 Vals 100 proof tasks · 1.1 · Vals 100 proof tasks; ceiling effect at top scores | 100 % independent lab ↗ | 99 % independent lab ↗ |
| ProgramBench Vals 200 public tasks raw pass rate · Vals 2026-09-27 · Vals 200 public tasks; raw pass rate; mini-SWE-agent | 87 % independent lab ↗ | 85.4 % independent lab ↗ |
| Humanity's Last Exam AA Index v4.3.2 (Opus Max fallback, Astra Max, Gemini High) · AA Index 4.3.2 · Opus Max with default fallback; Astra Max | 61 % independent lab ↗ | 55 % independent lab ↗ |
| AutomationBench-AA Index v4.3.2 (Opus Max fallback, Astra Max, Gemini High) · AA Index 4.3.2 · Opus Max with default fallback; Astra Max | 70 % independent lab ↗ | 68 % 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 | 91.549 % benchmark maintainer ↗ | 80.282 % benchmark maintainer ↗ |
| LiveBench javascript · 2026-06-25 · Public table; published model effort variant | 81.818 % 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 | 93.251 % benchmark maintainer ↗ | 92.166 % benchmark maintainer ↗ |
| LiveBench theory_of_mind · 2026-06-25 · Public table; published model effort variant | 84.615 % 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.
2026-09-22 · Claude Opus 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-opus-5-5 entered LiveBench code_completion (2026-06-25) at 86.957 % · source ↗
2026-09-30 verified (test date not published) · claude-opus-5-5 entered LiveBench code_generation (2026-06-25) at 91.549 % · source ↗
2026-09-30 verified (test date not published) · claude-opus-5-5 entered LiveBench javascript (2026-06-25) at 81.818 % · source ↗
2026-09-30 verified (test date not published) · claude-opus-5-5 entered LiveBench AMPS_Hard (2026-06-25) at 98 % · source ↗
2026-09-30 verified (test date not published) · claude-opus-5-5 entered LiveBench olympiad (2026-06-25) at 93.251 % · source ↗
An overall score appears only after enough current, comparable, independently sourced results exist. Pricing and individual benchmark results remain visible meanwhile.