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 Opus 5.5 | Gemini 3.5 Flash |
|---|---|---|
| Quantum Score | 88QUANTUM SCORE | Insufficient verified data85% coverage |
| Confidence / coverage | Moderate confidence · 85% · 4 independent domains | Limited evidence · 85% · 2 independent domains |
| Context window | 1,000,000 tokens | — tokens |
| Modalities / tools | text, image · tool use, vision | text, image · vision, tool use |
| Coding | 87 | 41 -46 vs first |
| Reasoning | 97 | 75 -22 vs first |
| Math | 92 | 81 -11 vs first |
| Research | — | — |
| Agents | 100 | 20 -80 vs first |
| Multimodal | 98 | 80 -18 vs first |
| Speed | — | — |
| Value | 53 | 44 -9 vs first |
| Input / 1M | $4.00 | $1.50 |
| Output / 1M | $20.00 | $9.00 |
| Measured output speed | 92 tokens/s · Max effort | — |
02 / EVIDENCE
Published benchmark evidence
| Benchmark | Claude Opus 5.5 | Gemini 3.5 Flash |
|---|---|---|
| LiveBench code_completion · 2026-06-25 · Public table; published model effort variant | 86.957 % benchmark maintainer ↗ | 76.087 % 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 ↗ | 91.877 % benchmark maintainer ↗ |
| LiveBench theory_of_mind · 2026-06-25 · Public table; published model effort variant | 84.615 % benchmark maintainer ↗ | 80.769 % benchmark maintainer ↗ |
| LiveBench zebra_puzzle · 2026-06-25 · Public table; published model effort variant | 100 % benchmark maintainer ↗ | 77.25 % benchmark maintainer ↗ |
| MMMU-Pro Mercor public leaderboard · MMMU-Pro Mercor public set · Mercor independent evaluation | 87.4 % independent lab ↗ | 84.7 % independent lab ↗ |
| MedXpertQA MM Mercor public leaderboard · MedXpertQA MM Mercor 200 public tasks · Mercor independent evaluation | 85.7 % independent lab ↗ | 83.5 % independent lab ↗ |
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
2026-05-19 · Gemini 3.5 Flash released ↗ · source
2026-09-30 verified (test date not published) · gemini-3-5-flash entered LiveBench code_completion (2026-06-25) at 76.087 % · source ↗
2026-09-30 verified (test date not published) · gemini-3-5-flash entered LiveBench code_generation (2026-06-25) at 80.282 % · source ↗
2026-09-30 verified (test date not published) · gemini-3-5-flash entered LiveBench javascript (2026-06-25) at 63.636 % · source ↗
2026-09-30 verified (test date not published) · gemini-3-5-flash entered LiveBench AMPS_Hard (2026-06-25) at 98 % · source ↗
2026-09-30 verified (test date not published) · gemini-3-5-flash entered LiveBench olympiad (2026-06-25) at 91.877 % · source ↗
2026-09-30 verified (test date not published) · gemini-3-5-flash entered LiveBench theory_of_mind (2026-06-25) at 80.769 % · source ↗
2026-09-30 verified (test date not published) · gemini-3-5-flash entered LiveBench zebra_puzzle (2026-06-25) at 77.25 % · 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.