# Claude Sonnet 5.5 vs Gemini 3.7 Flash

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

- Canonical page: https://benchlm.ai/compare/claude-sonnet-5-5-vs-gemini-3-7-flash
- Last updated: September 28, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Sonnet 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 Sonnet 5.5 leads overall 80.49 to 67.53.
- The clearest category separation is in coding, where the averages are 79.6 for Claude Sonnet 5.5 and 59.4 for Gemini 3.7 Flash.
- The biggest single benchmark swing is FrontierSWE v2 in Coding, with scores of 61.9% 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 Sonnet 5.5 | Gemini 3.7 Flash |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 80.49 | 67.53 |
| Benchmarks Covered | 47 | 25 |
| Pricing (input/output) | $2.00 / $10.00 | $0.75 / $3.75 |

## Category Breakdown

### Agentic

- Winner: Claude Sonnet 5.5
- Claude Sonnet 5.5 public-lane score: 66.1 (Supported · #10/111)
- Gemini 3.7 Flash public-lane score: 57.9 (Supported · #21/111)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 70.60% | Coming soon | Coming soon |
| HLE w/ tools | 64.5% | Coming soon | Coming soon |
| DRACO | 87.0% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 59.9% | Coming soon | Coming soon |
| LAB all-pass (Harvey held-out) | 10.0% | Coming soon | Coming soon |
| LAB criterion-pass (Harvey held-out) | 93.1% | Coming soon | Coming soon |
| Toolathlon Verified Pass@3 | 85.2% | Coming soon | Coming soon |
| Toolathlon Verified Pass³ | 68.5% | Coming soon | Coming soon |
| Toolathlon Verified avg. turns | 31.6 turns | Coming soon | Coming soon |
| AutomationBench (Zapier 1.0.6) | 44.7% | Coming soon | Coming soon |
| Toolathlon-Verified | 77.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.8% | Coming soon |
| Terminal-Bench 3.0 | Coming soon | 14.9% | Coming soon |
| AutomationBench | Coming soon | 30.4% | Coming soon |
| OSWorld 2.0 | Coming soon | 47.9% | 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: Directional only
- Claude Sonnet 5.5 public-lane score: 79.6 (Estimated · #3/136)
- Gemini 3.7 Flash public-lane score: 59.4 (Supported · #18/136)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 46.2% | 43.6% | Claude Sonnet 5.5 |
| cursorBench40 | 55.5% | Coming soon | Coming soon |
| SWE-bench Pro | 81.3% | Coming soon | Coming soon |
| SWE Multilingual | 90.3% | Coming soon | Coming soon |
| SWE Multimodal | 54.3% | Coming soon | Coming soon |
| DeepSWE | 71.0% | 65.3% | Claude Sonnet 5.5 |
| FrontierCode 1.1 Extended | 59.1% | Coming soon | Coming soon |
| ProgramBench | 79.7% | Coming soon | Coming soon |
| FrontierSWE v2 | 61.9% | 20.3% | Claude Sonnet 5.5 |
| 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: Not comparable
- Claude Sonnet 5.5 public-lane score: 79.2 (#7/27)
- Gemini 3.7 Flash public-lane score: 77.9 (Unranked · 5 rankable rows)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 64K-128K | Coming soon | 97% | Coming soon |
| ARC-AGI-1 | Coming soon | 95.50% | Coming soon |
| ARC-AGI-2 | Coming soon | 84.6% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Sonnet 5.5 public-lane score: 83.3 (Unranked · 7 rankable rows)
- Gemini 3.7 Flash public-lane score: 83.6 (#10/50)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 61.6% | Coming soon | Coming soon |
| Chartography (tools) | 90.2% | Coming soon | Coming soon |
| BenchCAD Vision2Code (no tools) | 0.747 | Coming soon | Coming soon |
| BenchCAD Vision2Code (tools) | 0.963 | Coming soon | Coming soon |
| Biomedical image analysis | 72.2% | Coming soon | Coming soon |
| OfficeQA | 76.9% | Coming soon | Coming soon |
| OfficeQA Pro | 65.6% | 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: Claude Sonnet 5.5
- Claude Sonnet 5.5 public-lane score: 80.9 (Supported · #6/160)
- Gemini 3.7 Flash public-lane score: 71 (Supported · #11/160)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | 69.4% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 65.4% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 77.1% | Coming soon | Coming soon |
| HealthBench Professional | 69.2% | Coming soon | Coming soon |
| BioMysteryBench (human-solvable) | 89.2% | 87.1% | Claude Sonnet 5.5 |
| BioMysteryBench (human-difficult) | 44.7% | 43.5% | Claude Sonnet 5.5 |
| SpatialBench Verified | 72.5% | Coming soon | Coming soon |
| SingleCellBench | 59.1% | Coming soon | Coming soon |
| Protein Design | 51.0% | Coming soon | Coming soon |
| Morphology-to-molecule matching | 25.0% | Coming soon | Coming soon |
| Medicinal chemistry | 65.3% | Coming soon | Coming soon |
| Protein Design library ranking | 54.8% | Coming soon | Coming soon |
| De novo protein-binder design | 82.3% | Coming soon | Coming soon |
| Protocols (troubleshooting) | 67.3% | Coming soon | Coming soon |
| Protocols (understanding) | 66.6% | Coming soon | Coming soon |
| HLE w/o tools | 56.9% | 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: Not comparable
- Claude Sonnet 5.5 public-lane score: Coming soon
- Gemini 3.7 Flash public-lane score: Coming soon

| Benchmark | Claude Sonnet 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 92.1% | Coming soon | Coming soon |
| MILU | 91.6% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Sonnet 5.5 public-lane score: Coming soon
- Gemini 3.7 Flash public-lane score: Coming soon

| Benchmark | Claude Sonnet 5.5 | Gemini 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| ArXivMath Aug. 2026 (no tools) | 86.8% | Coming soon | Coming soon |
| ArXivMath Aug. 2026 (tools) | 95.2% | Coming soon | Coming soon |

## FAQ

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

Claude Sonnet 5.5 is ahead overall on BenchLM right now.

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

The widest category gap is in coding, where the averages are 79.6 for Claude Sonnet 5.5 and 59.4 for Gemini 3.7 Flash.

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

Claude Sonnet 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 25 sourced benchmark scores on BenchLM.

## Related Comparisons

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

## Explore More

- [Claude Sonnet 5.5 profile](/models/claude-sonnet-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)