Model comparison
Claude Opus 5.5 vs Gemini 2.0 Flash (Feb 2025)
Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 34.8 on the Noometry Index.
Last verified . 16 shared benchmarks.
GoogleSummary
- They share 16 benchmarks with published results for both. Claude Opus 5.5 scores higher in 10 categories and Gemini 2.0 Flash (Feb 2025) in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 5.5 leads 79.5 to 15.2.
- The biggest single-benchmark swing is ARC-AGI-2: 92.5% for Claude Opus 5.5 and 1.3% for Gemini 2.0 Flash (Feb 2025).
Side by side
| Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) | |
|---|---|---|
| Provider | Anthropic | |
| Noometry Index | 68.5 | 34.8 |
| Released | 2026-09-22 | 2024-12-06 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $4 | — |
| Output $ / M tokens | $20 | — |
| Results tracked | 35 | 54 |
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Category by category
Coding Claude Opus 5.5 leads
Claude Opus 5.5: 71.4 (#1), Gemini 2.0 Flash (Feb 2025): 28.2 (#308)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Coding | 1545 | 1351 |
| FrontierCode | 54.4% | — |
| SWE-bench Verified (bash only) | — | 13.5% |
| Aider Polyglot | — | 38.2% |
| CursorBench | 57.8% | — |
| LMArena WebDev | 1820 | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| WeirdML | — | 25.8% |
| BigCodeBench Instruct | — | 45.9% |
| LiveBench Coding | — | 63.4% |
| MirrorCode | 77.4% | — |
| BigCodeBench Complete | — | 59.9% |
| CadEval | — | 30% |
Agentic & Tool Use Claude Opus 5.5 leads
Claude Opus 5.5: 45.3 (#13), Gemini 2.0 Flash (Feb 2025): 28.0 (#85)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| APEX-Agents | 73.5% | — |
| TheAgentCompany | — | 11.4% |
| GDP.pdf | 30.6% | — |
Reasoning Claude Opus 5.5 leads
Claude Opus 5.5: 79.5 (#2), Gemini 2.0 Flash (Feb 2025): 15.2 (#308)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| ARC-AGI-2 | 92.5% | 1.3% |
| LMArena Hard Prompts | 1545 | 1346 |
| DTBench | 98.9% | 63.2% |
| SimpleBench | — | 31.1% |
| Kagi LLM Benchmark | — | 37.8% |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 31.7% | — |
| EnigmaEval | — | 1.1% |
| EBR-Bench | 71.4% | — |
| LiveBench Reasoning | — | 78.2% |
| Mystery Game Puzzles | 71% | — |
| LiveBench Data Analysis | — | 69.4% |
| LMCA | 68.2% | — |
| Epoch Capabilities Index | — | 135.36 |
| LiveBench | — | 66.9% |
Math Claude Opus 5.5 leads
Claude Opus 5.5: 92.4 (#2), Gemini 2.0 Flash (Feb 2025): 36.1 (#127)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 57.8% |
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 45.9% |
| LiveBench Math | — | 75.8% |
| LMArena Math | — | 1351 |
| MATH Level 5 | — | 82.2% |
| FrontierMath (Feb 2025 set) | — | 1.7% |
Knowledge Claude Opus 5.5 leads
Claude Opus 5.5: 66.6 (#9), Gemini 2.0 Flash (Feb 2025): 32.0 (#207)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| GPQA Diamond | 90.6% | 64.1% |
| LMArena Expert | 1564 | 1340 |
| Humanity's Last Exam | — | 6.6% |
| SimpleQA Verified | 72.2% | — |
| MMLU-Pro | — | 73.7% |
| Confabulations | — | 12.4% |
| GPQA (HELM) | — | 55.6% |
| MMLU | — | 79.7% |
Multimodal Claude Opus 5.5 leads
Claude Opus 5.5: 56.5 (#2), Gemini 2.0 Flash (Feb 2025): 35.9 (#74)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Vision | — | 1158 |
| GeoBench | — | 77% |
| Furniture Assembly | 83.3% | — |
Multilingual Claude Opus 5.5 leads
Claude Opus 5.5: 59.8 (#1), Gemini 2.0 Flash (Feb 2025): 47.6 (#144)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Non-English | 1513 | 1342 |
| LMArena Chinese | 1572 | 1373 |
| LMArena Russian | 1532 | 1351 |
| LMArena French | — | 1390 |
| LMArena German | — | 1354 |
| LMArena Japanese | — | 1293 |
| LMArena Korean | — | 1314 |
| LMArena Spanish | — | 1363 |
Instruction Following Claude Opus 5.5 leads
Claude Opus 5.5: 80.1 (#2), Gemini 2.0 Flash (Feb 2025): 74.6 (#91)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Instruction Following | 1535 | 1336 |
| LiveBench Instruction Following | — | 85.8% |
| IFEval | — | 84.1% |
Long Context Claude Opus 5.5 leads
Claude Opus 5.5: 47.3 (#18), Gemini 2.0 Flash (Feb 2025): 38.1 (#198)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Longer Query | 1540 | 1345 |
| Fiction.LiveBench | — | 61.1% |
Writing & Preference Claude Opus 5.5 leads
Claude Opus 5.5: 78.7 (#3), Gemini 2.0 Flash (Feb 2025): 49.8 (#184)
| Benchmark | Claude Opus 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Text | 1518 | 1354 |
| LMArena Creative Writing | 1538 | 1340 |
| EQ-Bench Creative Writing | 2050 | 1128 |
| LMArena Multi-Turn | 1520 | 1350 |
| Short-Story Creative Writing | — | 73.8% |
| WildBench | — | 80% |
| LiveBench Language | — | 51.3% |
Frequently asked questions
Is Claude Opus 5.5 better than Gemini 2.0 Flash (Feb 2025)?
Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 34.8 on the Noometry Index.
Is Claude Opus 5.5 or Gemini 2.0 Flash (Feb 2025) better for coding?
Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 28.2 in the Noometry coding category.
How many benchmarks do Claude Opus 5.5 and Gemini 2.0 Flash (Feb 2025) share?
16 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Gemini 2.0 Flash (Feb 2025) has 54.