Model comparison
Claude Opus 5.5 vs Gemini 1.5 Flash (May 2024)
Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 32.9 on the Noometry Index.
Last verified . 14 shared benchmarks.
GoogleSummary
- They share 14 benchmarks with published results for both. Claude Opus 5.5 scores higher in 10 categories and Gemini 1.5 Flash (May 2024) in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 20.8.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Opus 5.5 and 16.3% for Gemini 1.5 Flash (May 2024).
Side by side
| Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) | |
|---|---|---|
| Provider | Anthropic | |
| Noometry Index | 68.5 | 32.9 |
| Released | 2026-09-22 | 2024-05-14 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $4 | — |
| Output $ / M tokens | $20 | — |
| Results tracked | 35 | 42 |
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Category by category
Coding Claude Opus 5.5 leads
Claude Opus 5.5: 71.4 (#1), Gemini 1.5 Flash (May 2024): 33.9 (#233)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Coding | 1545 | 1262 |
| FrontierCode | 54.4% | — |
| CursorBench | 57.8% | — |
| LMArena WebDev | 1820 | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| WeirdML | — | 24.9% |
| BigCodeBench Instruct | — | 43.5% |
| MirrorCode | 77.4% | — |
| BigCodeBench Complete | — | 55.1% |
| HumanEval+ | — | 75.6% |
| MBPP+ | — | 67.5% |
Agentic & Tool Use Claude Opus 5.5 leads
Claude Opus 5.5: 45.3 (#13), Gemini 1.5 Flash (May 2024): 26.3 (#97)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| APEX-Agents | 73.5% | — |
| BALROG | — | 14.6% |
| GDP.pdf | 30.6% | — |
Reasoning Claude Opus 5.5 leads
Claude Opus 5.5: 79.5 (#2), Gemini 1.5 Flash (May 2024): 20.8 (#212)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Hard Prompts | 1545 | 1257 |
| DTBench | 98.9% | 53.8% |
| ARC-AGI-2 | 92.5% | — |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 31.7% | — |
| EBR-Bench | 71.4% | — |
| Mystery Game Puzzles | 71% | — |
| LMCA | 68.2% | — |
| Epoch Capabilities Index | — | 129.37 |
| ForecastBench | — | 53.9 |
| PIQA | — | 87.5% |
Math Claude Opus 5.5 leads
Claude Opus 5.5: 92.4 (#2), Gemini 1.5 Flash (May 2024): 20.8 (#274)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 16.3% |
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 30.4% |
| LMArena Math | — | 1269 |
| MATH Level 5 | — | 61.9% |
| FrontierMath (Feb 2025 set) | — | 0% |
| GSM8K | — | 82.4% |
Knowledge Claude Opus 5.5 leads
Claude Opus 5.5: 66.6 (#9), Gemini 1.5 Flash (May 2024): 26.2 (#253)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| GPQA Diamond | 90.6% | 47.3% |
| LMArena Expert | 1564 | 1233 |
| SimpleQA Verified | 72.2% | — |
| MMLU-Pro | — | 67.8% |
| GPQA (HELM) | — | 43.7% |
| BoolQ | — | 85.8% |
| MMLU | — | 77.9% |
Multimodal Claude Opus 5.5 leads
Claude Opus 5.5: 56.5 (#2), Gemini 1.5 Flash (May 2024): 35.3 (#76)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Vision | — | 1141 |
| Video-MME | — | 70.3% |
| GeoBench | — | 76% |
| Furniture Assembly | 83.3% | — |
Multilingual Claude Opus 5.5 leads
Claude Opus 5.5: 59.8 (#1), Gemini 1.5 Flash (May 2024): 43.1 (#184)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Non-English | 1513 | 1278 |
| LMArena Chinese | 1572 | 1295 |
| LMArena Russian | 1532 | 1288 |
| LMArena French | — | 1257 |
| LMArena German | — | 1262 |
| LMArena Japanese | — | 1252 |
| LMArena Korean | — | 1220 |
| LMArena Spanish | — | 1242 |
Instruction Following Claude Opus 5.5 leads
Claude Opus 5.5: 80.1 (#2), Gemini 1.5 Flash (May 2024): 67.0 (#199)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Instruction Following | 1535 | 1258 |
| IFEval | — | 83.1% |
Long Context Claude Opus 5.5 leads
Claude Opus 5.5: 47.3 (#18), Gemini 1.5 Flash (May 2024): 39.0 (#182)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Longer Query | 1540 | 1284 |
Writing & Preference Claude Opus 5.5 leads
Claude Opus 5.5: 78.7 (#3), Gemini 1.5 Flash (May 2024): 48.9 (#190)
| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Text | 1518 | 1287 |
| LMArena Creative Writing | 1538 | 1285 |
| LMArena Multi-Turn | 1520 | 1253 |
| EQ-Bench Creative Writing | 2050 | — |
| WildBench | — | 79.2% |
Frequently asked questions
Is Claude Opus 5.5 better than Gemini 1.5 Flash (May 2024)?
Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 32.9 on the Noometry Index.
Is Claude Opus 5.5 or Gemini 1.5 Flash (May 2024) better for coding?
Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 33.9 in the Noometry coding category.
How many benchmarks do Claude Opus 5.5 and Gemini 1.5 Flash (May 2024) share?
14 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Gemini 1.5 Flash (May 2024) has 42.