# Claude Opus 5.5 vs Gemini 3.7 Flash

> Side-by-side benchmark comparison for Claude Opus 5.5 and Gemini 3.7 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-5-5-vs-gemini-3-7-flash
- Last updated: September 22, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Claude Opus 5.5 if you want the stronger benchmark profile. Gemini 3.7 Flash only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Opus 5.5 leads overall 81.03 to 68.83.
- The clearest category separation is in agentic, where the averages are 82.9 for Claude Opus 5.5 and 59.4 for Gemini 3.7 Flash.
- The biggest single benchmark swing is FrontierSWE v2 in Coding, with scores of 62.3% and 20.3%.
- Gemini 3.7 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Opus 5.5 | Gemini 3.7 Flash |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 81.03 | 68.83 |
| Benchmarks Covered | 47 | 23 |
| Pricing (input/output) | $4.00 / $20.00 | $0.75 / $3.75 |

## Category Breakdown

### Agentic

- Winner: Claude Opus 5.5
- Claude Opus 5.5 public-lane score: 82.9 (Supported · #1/157)
- Gemini 3.7 Flash public-lane score: 59.4 (Supported · #27/157)

| Benchmark | Claude Opus 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 66.40% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 58.7% | Coming soon | Coming soon |
| AutomationBench | 40.0% | 30.4% | Claude Opus 5.5 |
| HLE w/ tools | 67.7% | Coming soon | Coming soon |
| OSWorld 2.0 | 48.7% | 47.9% | Claude Opus 5.5 |
| LAB all-pass (Harvey held-out) | 8.3% | Coming soon | Coming soon |
| LAB criterion-pass (Harvey held-out) | 91.2% | Coming soon | Coming soon |
| Toolathlon-Verified | 77.8% | Coming soon | Coming soon |
| Toolathlon Verified Pass@3 | 82.4% | Coming soon | Coming soon |
| Toolathlon Verified Pass³ | 72.2% | Coming soon | Coming soon |
| Toolathlon Verified avg. turns | 26.9 turns | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.8% | Coming soon |
| Terminal-Bench 3.0 | Coming soon | 14.9% | Coming soon |
| Agents' Last Exam | Coming soon | 26.3% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 77.5% | Coming soon |
| ApprenticeBench | Coming soon | 16% | Coming soon |

### Coding

- Winner: Claude Opus 5.5
- Claude Opus 5.5 public-lane score: 80.1 (Supported · #2/159)
- Gemini 3.7 Flash public-lane score: 62.2 (Supported · #20/159)

| Benchmark | Claude Opus 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 54.4% | 43.6% | Claude Opus 5.5 |
| cursorBench40 | 57.8% | Coming soon | Coming soon |
| SWE-bench Pro | 89.9% | Coming soon | Coming soon |
| SWE Multilingual | 93.9% | Coming soon | Coming soon |
| SWE Multimodal | 61.4% | Coming soon | Coming soon |
| DeepSWE | 74.2% | 65.3% | Claude Opus 5.5 |
| FrontierCode 1.1 Extended | 63.6% | Coming soon | Coming soon |
| FrontierSWE v2 | 62.3% | 20.3% | Claude Opus 5.5 |
| ProgramBench | 91.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.8% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 88.7% | Coming soon |
| SWE-bench (Vals) | Coming soon | 80.8% | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Opus 5.5 public-lane score: 78.5 (#4/17)
- Gemini 3.7 Flash public-lane score: 77.2 (Unranked · 3 rankable rows)

| Benchmark | Claude Opus 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 64K-128K | Coming soon | 97% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Opus 5.5 public-lane score: 88.8 (#3/50)
- Gemini 3.7 Flash public-lane score: 82.6 (#10/50)

| Benchmark | Claude Opus 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| Chartography (tools) | 89.0% | Coming soon | Coming soon |
| Chartography (no tools) | 64.4% | Coming soon | Coming soon |
| BenchCAD Vision2Code (no tools) | 0.730 | Coming soon | Coming soon |
| BenchCAD Vision2Code (tools) | 0.962 | Coming soon | Coming soon |
| Biomedical image analysis | 71.4% | Coming soon | Coming soon |
| OfficeQA | 78.9% | Coming soon | Coming soon |
| OfficeQA Pro | 67.7% | Coming soon | Coming soon |
| CharXiv w/o tools | Coming soon | 84.5% | Coming soon |
| CharXiv | Coming soon | 88.7% | Coming soon |
| LVBench | Coming soon | 85.4% | Coming soon |

### Knowledge

- Winner: Coming soon
- Claude Opus 5.5 public-lane score: 81.8 (Estimated · #4/189)
- Gemini 3.7 Flash public-lane score: 69 (Supported · #17/189)

| Benchmark | Claude Opus 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| HLE w/o tools | 64.4% | Coming soon | Coming soon |
| HealthBench (raw) | 68.1% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 60.6% | Coming soon | Coming soon |
| HealthBench Professional | 65.6% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 77.1% | Coming soon | Coming soon |
| BioMysteryBench (human-solvable) | 89.3% | 87.1% | Claude Opus 5.5 |
| BioMysteryBench (human-difficult) | 50.0% | 43.5% | Claude Opus 5.5 |
| SpatialBench Verified | 72.0% | Coming soon | Coming soon |
| SingleCellBench | 61.2% | Coming soon | Coming soon |
| Morphology-to-molecule matching | 34.0% | Coming soon | Coming soon |
| Medicinal chemistry | 63.5% | Coming soon | Coming soon |
| Protein Design | 60.2% | Coming soon | Coming soon |
| Protein Design library ranking | 56.0% | Coming soon | Coming soon |
| De novo protein-binder design | 82.6% | Coming soon | Coming soon |
| Protocols (troubleshooting) | 73.7% | Coming soon | Coming soon |
| Protocols (understanding) | 69.0% | Coming soon | Coming soon |
| HLE-Verified | Coming soon | 53.6% | Coming soon |
| LABBench2 | Coming soon | 82.1% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 93.9% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 90.1% | Coming soon |

### Multilingual

- Winner: Coming soon
- Claude Opus 5.5 public-lane score: Coming soon
- Gemini 3.7 Flash public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 94.3% | Coming soon | Coming soon |
| MILU | 93.1% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- Claude Opus 5.5 public-lane score: Coming soon
- Gemini 3.7 Flash public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| ArXivMath Aug. 2026 (no tools) | 91.2% | Coming soon | Coming soon |
| ArXivMath Aug. 2026 (tools) | 96.9% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Opus 5.5 or Gemini 3.7 Flash?

Claude Opus 5.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 5.5 and Gemini 3.7 Flash?

The widest category gap is in agentic, where the averages are 82.9 for Claude Opus 5.5 and 59.4 for Gemini 3.7 Flash.

### How many benchmarks does Claude Opus 5.5 cover on BenchLM?

Claude Opus 5.5 currently has 47 sourced benchmark scores on BenchLM.

### How many benchmarks does Gemini 3.7 Flash cover on BenchLM?

Gemini 3.7 Flash currently has 23 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 5.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Gemini 3.7 Flash vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gemini-3-7-flash)
- [Claude Opus 5.5 vs GPT-6 Astra](/compare/claude-opus-5-5-vs-gpt-6-astra)
- [Gemini 3.7 Flash vs GPT-6 Astra](/compare/gemini-3-7-flash-vs-gpt-6-astra)

## Explore More

- [Claude Opus 5.5 profile](/models/claude-opus-5-5)
- [Gemini 3.7 Flash profile](/models/gemini-3-7-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)