# Claude Sonnet 5.5 vs GPT-6.1 Sol

> Side-by-side benchmark comparison for Claude Sonnet 5.5 and GPT-6.1 Sol across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-5-5-vs-gpt-6-1-sol
- Last updated: September 29, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Sonnet 5.5 if you want the stronger benchmark profile. GPT-6.1 Sol 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 80.9 to 66.86.
- The clearest category separation is in coding, where the averages are 85.1 for Claude Sonnet 5.5 and 67 for GPT-6.1 Sol.
- The biggest single benchmark swing is HealthBench (raw) in Knowledge, with scores of 69.4% and 56.7%.
- GPT-6.1 Sol also has the larger context window at 1.05M.

## Model Snapshot

| Property | Claude Sonnet 5.5 | GPT-6.1 Sol |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 80.9 | 66.86 |
| Benchmarks Covered | 47 | 9 |
| Pricing (input/output) | $2.00 / $10.00 | $2.00 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Sonnet 5.5 public-lane score: 67.1 (Supported · #10/117)
- GPT-6.1 Sol public-lane score: Coming soon

| Benchmark | Claude Sonnet 5.5 | GPT-6.1 Sol | 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% | 57.0% | Claude Sonnet 5.5 |
| 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 |
| AutomationBench | Coming soon | 36.1% | Coming soon |
| ExploitGym | Coming soon | 35.1% | Coming soon |

### Coding

- Winner: Claude Sonnet 5.5
- Claude Sonnet 5.5 public-lane score: 85.1 (Supported · #1/143)
- GPT-6.1 Sol public-lane score: 67 (Supported · #8/143)

| Benchmark | Claude Sonnet 5.5 | GPT-6.1 Sol | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 46.2% | Coming soon | Coming soon |
| 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% | 71.9% | GPT-6.1 Sol |
| FrontierCode 1.1 Extended | 59.1% | Coming soon | Coming soon |
| ProgramBench | 79.7% | Coming soon | Coming soon |
| FrontierSWE v2 | 61.9% | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Sonnet 5.5 public-lane score: 79.2 (#7/27)
- GPT-6.1 Sol public-lane score: 79.4 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Not comparable
- Claude Sonnet 5.5 public-lane score: 83.3 (Unranked · 7 rankable rows)
- GPT-6.1 Sol public-lane score: 83.9 (Unranked · 1 rankable row)

| Benchmark | Claude Sonnet 5.5 | GPT-6.1 Sol | 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 |

### Knowledge

- Winner: Directional only
- Claude Sonnet 5.5 public-lane score: 80.6 (Supported · #6/169)
- GPT-6.1 Sol public-lane score: 71.3 (Estimated · #10/169)

| Benchmark | Claude Sonnet 5.5 | GPT-6.1 Sol | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | 69.4% | 56.7% | Claude Sonnet 5.5 |
| HealthBench (length-adjusted) | 65.4% | 58.5% | Claude Sonnet 5.5 |
| HealthBench Professional (raw) | 77.1% | 67.2% | Claude Sonnet 5.5 |
| HealthBench Professional | 69.2% | 64.2% | Claude Sonnet 5.5 |
| BioMysteryBench (human-solvable) | 89.2% | Coming soon | Coming soon |
| BioMysteryBench (human-difficult) | 44.7% | Coming soon | Coming soon |
| 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 |
| HealthBench Hard | Coming soon | 36.2% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Sonnet 5.5 public-lane score: Coming soon
- GPT-6.1 Sol public-lane score: Coming soon

| Benchmark | Claude Sonnet 5.5 | GPT-6.1 Sol | 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
- GPT-6.1 Sol public-lane score: Coming soon

| Benchmark | Claude Sonnet 5.5 | GPT-6.1 Sol | 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 GPT-6.1 Sol?

Claude Sonnet 5.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Sonnet 5.5 and GPT-6.1 Sol?

The widest category gap is in coding, where the averages are 85.1 for Claude Sonnet 5.5 and 67 for GPT-6.1 Sol.

### 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 GPT-6.1 Sol cover on BenchLM?

GPT-6.1 Sol currently has 9 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 5.5 vs GPT-6 Astra](/compare/claude-sonnet-5-5-vs-gpt-6-astra)
- [GPT-6.1 Sol vs GPT-6 Astra](/compare/gpt-6-1-sol-vs-gpt-6-astra)
- [Claude Sonnet 5.5 vs GPT-6 Sol](/compare/claude-sonnet-5-5-vs-gpt-6-sol)
- [GPT-6.1 Sol vs GPT-6 Sol](/compare/gpt-6-1-sol-vs-gpt-6-sol)

## Explore More

- [Claude Sonnet 5.5 profile](/models/claude-sonnet-5-5)
- [GPT-6.1 Sol profile](/models/gpt-6-1-sol)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)