Claude Opus 5.5 vs Gemini 3.7 Flash
Claude Opus 5.5 
Gemini 3.7 Flash Verdict
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 64.4.
- Claude Opus 5.5 (thinking) is stronger in composite, knowledge, long context, multimodal, reasoning.
- Gemini 3.7 Flash (medium) is stronger in agents & tools, coding.
- Gemini 3.7 Flash (medium) is 5.3× cheaper ($1.50 vs $8.00 per 1M blended).
- Gemini 3.7 Flash (medium) streams 6.1× faster (292 vs 48 tokens per second).
| Metric | Claude Opus 5.5 (thinking) | Gemini 3.7 Flash (medium) |
|---|---|---|
| BenchLeader Index | 70.7 | 64.4 |
| Composite score | 95.0 | 77.5 |
| Knowledge score | 85.0 | 74.4 |
| Long context score | 68.5 | 67.7 |
| Multimodal score | 71.9 | 68.9 |
| Reasoning score | 95.0 | 61.6 |
| Agents & tools score | – | 64.1 |
| Coding score | – | 70.0 |
| Blended price $/M | $8.00 | $1.50 |
| Output speed | 48 tok/s | 292 tok/s |
| Time to first answer | 4.2 s | 4.4 s |
| Context window | 1M | 1.0M |
| SciCode | – | 59.8% |
| AA Intelligence Index | 57.6 | 39.6 |
| AA-LCR | 84.7% | 83.0% |
| MMMU-Pro | 87.7% | 84.7% |
| AA-Omniscience | 46.4 | 23.7 |
| GPQA Diamond (AA) | – | 92.1% |
| Humanity's Last Exam (AA) | 61.4% | 39.0% |
| SciCode (AA) | 66.9% | 59.8% |
| ARC-AGI-1 | – | 91.2% |
| ARC-AGI-2 | – | 63.8% |
| CritPt | 31.7% | 9.4% |
| GDPval (AA) | 67.3% | 42.0% |
| τ²-Bench Banking (AA) | – | 35.5% |
| DeepSWE | – | 65.5% |
| LMCA | – | 49.2% |
| DTBench | – | 94.7% |
| GDP.pdf | – | 21.8% |
| Terminal-Bench 4.0 (AA) | 59.6% | – |
| Terminal-Bench 2.1 (AA) | – | 78.3% |
| AutomationBench | 69.5% | – |
| GDP.pdf | 26.2% | – |
| Harvey LAB | 91.2% | – |
| EnterpriseOps-Gym | – | 50.4% |
| AA-Omniscience: accuracy | 66.2% | 54.0% |
| AA-Omniscience: non-hallucination | 41.4% | 34.1% |
| AA-Briefcase | 1822 | – |
Data as of 2026-09-22. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 5.5 vs Gemini 3.7 Flash: questions
- Is Claude Opus 5.5 better than Gemini 3.7 Flash?
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 64.4. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5.5 (thinking) is ahead overall as of 2026-09-22, but check the category scores for your use.
- Which is cheaper, Claude Opus 5.5 or Gemini 3.7 Flash?
- Gemini 3.7 Flash is cheaper: $1.50 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 5.5 or Gemini 3.7 Flash?
- Gemini 3.7 Flash streams faster: 292 against 48 output tokens per second.
- Which has the larger context window?
- Gemini 3.7 Flash accepts more context: 1.0M against 1M tokens.