# Claude Sonnet 5.5 vs GPT-6 Sol

> Claude Sonnet 5.5 and GPT-6 Sol score almost the same on the Noometry Index (61.9 vs 61.8), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-gpt-6-sol
- Last updated: 2026-10-10
- Shared benchmarks: 29

## Summary

- They share 29 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and GPT-6 Sol in 2 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Sol leads 74.0 to 54.0.
- The biggest single-benchmark swing is APEX-Agents: 75.5% for Claude Sonnet 5.5 and 54.3% for GPT-6 Sol.
- Both cost about the same: $2 input and $10 output per million tokens.
- GPT-6 Sol accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 61.9 | 61.8 |
| Rank | 10 | 12 |
| Context | 1M | 1.05M |
| Input $/M | $2 | $2 |
| Output $/M | $10 | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 67.3 (#6)
- GPT-6 Sol: 60.1 (#11)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| FrontierCode | 52.1% | 49.3% |
| LMArena WebDev | 1774 | 1688 |
| SciCode | 61% | 57.6% |
| LMArena Coding | 1513 | 1447 |
| ALE-Bench | 1,819 | 2,462 |
| DeepSWE | — | 68.8% |
| CursorBench | 55.5% | — |
| FrontierSWE | 61.9% | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 45.0 (#16)
- GPT-6 Sol: 37.2 (#36)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| APEX-Agents | 75.5% | 54.3% |
| GDP.pdf | — | 26.4% |
| Vending-Bench 2 | — | 14,428 |

## Reasoning

- Claude Sonnet 5.5: 54.0 (#28)
- GPT-6 Sol: 74.0 (#9)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| NYT Connections (extended) | 80.5% | 90.1% |
| CritPt | 31.4% | 30.9% |
| LMArena Hard Prompts | 1495 | 1418 |
| Mystery Game Puzzles | 65% | 56% |
| Epoch Capabilities Index | 165.03 | 162.72 |
| ARC-AGI-2 | — | 89.6% |
| ARC-AGI-1 | — | 95.5% |
| EBR-Bench | — | 53.3% |
| DTBench | — | 97.3% |
| LMCA | — | 59.1% |

## Math

- Claude Sonnet 5.5: 87.9 (#6)
- GPT-6 Sol: 87.2 (#7)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | 89.8% |
| FrontierMath Tier 4 | 80.5% | 90% |
| OTIS Mock AIME 2024-2025 | 100% | 100% |
| ProofBench | 100% | 83% |
| LMArena Math | 1510 | 1402 |
| FrontierMath Erdős | 2.9% | — |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#12)
- GPT-6 Sol: 64.8 (#15)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| GPQA Diamond | 95.6% | 94.3% |
| SimpleQA Verified | 46.5% | 60.7% |
| LMArena Expert | 1540 | 1439 |
| Vectara Hallucination Rate | — | 6.5% |

## Multimodal

- Claude Sonnet 5.5: 51.5 (#6)
- GPT-6 Sol: 47.6 (#10)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| LMArena Vision | 1289 | 1245 |
| Furniture Assembly | 75% | 58.3% |
| Blueprint-Bench 2 | — | 36.9% |

## Multilingual

- Claude Sonnet 5.5: 55.3 (#30)
- GPT-6 Sol: 50.5 (#118)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| LMArena Non-English | 1452 | 1385 |
| LMArena Chinese | 1522 | 1405 |
| LMArena Russian | 1451 | 1401 |
| LMArena French | — | 1410 |
| LMArena German | — | 1390 |
| LMArena Japanese | — | 1385 |
| LMArena Korean | — | 1341 |
| LMArena Spanish | — | 1384 |

## Instruction Following

- Claude Sonnet 5.5: 78.3 (#11)
- GPT-6 Sol: 74.5 (#94)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| LMArena Instruction Following | 1495 | 1412 |

## Long Context

- Claude Sonnet 5.5: 45.9 (#28)
- GPT-6 Sol: 43.1 (#108)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| LMArena Longer Query | 1498 | 1411 |

## Writing & Preference

- Claude Sonnet 5.5: 66.0 (#40)
- GPT-6 Sol: 71.9 (#18)

| Benchmark | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| LMArena Text | 1471 | 1395 |
| LMArena Creative Writing | 1465 | 1378 |
| LMArena Multi-Turn | 1474 | 1412 |
| EQ-Bench Creative Writing | — | 2125 |

## FAQ

### Is Claude Sonnet 5.5 better than GPT-6 Sol?

Claude Sonnet 5.5 and GPT-6 Sol score almost the same on the Noometry Index (61.9 vs 61.8), so choose on price, context window or the category you care about most.

### Which is cheaper, Claude Sonnet 5.5 or GPT-6 Sol?

GPT-6 Sol is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

### Is Claude Sonnet 5.5 or GPT-6 Sol better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 60.1 in the Noometry coding category.

### Which has the bigger context window?

GPT-6 Sol does, with 1.05M tokens against 1M.

### How many benchmarks do Claude Sonnet 5.5 and GPT-6 Sol share?

29 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and GPT-6 Sol has 45.