Claude Sonnet 5 vs GPT-5.6 Sol
Claude Sonnet 5 
GPT-5.6 Sol Verdict
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 61.4.
- Claude Sonnet 5 (high) is stronger in human preference, reasoning.
- GPT-5.6 Sol (high) is stronger in agents & tools, coding, composite, knowledge, long context, multimodal, instruction following.
- Claude Sonnet 5 (high) is 2.0× cheaper ($4.00 vs $8.00 per 1M blended).
| Metric | Claude Sonnet 5 (high) | GPT-5.6 Sol (high) |
|---|---|---|
| BenchLeader Index | 61.4 | 68.2 |
| Agents & tools score | 61.8 | 87.9 |
| Coding score | 61.6 | 72.4 |
| Composite score | 69.5 | 82.7 |
| Human preference score | 66.2 | – |
| Knowledge score | 62.4 | 73.8 |
| Long context score | 64.8 | 67.4 |
| Multimodal score | 63.1 | 66.4 |
| Reasoning score | 66.8 | 63.3 |
| Instruction following score | – | 67.8 |
| Blended price $/M | $4.00 | $8.00 |
| Output speed | 60 tok/s | 59 tok/s |
| Time to first answer | 10.0 s | 31.0 s |
| Context window | 1M | 1M |
| SciCode | 48.6% | 56.9% |
| WeirdML | 68.8% | 88.8% |
| LMArena Text | 1462 | – |
| LMArena Hard Prompts | 1490 | – |
| LMArena Coding | 1521 | – |
| LMArena WebDev | 1538 | – |
| LMArena Vision | 1278 | – |
| LMArena Agent | 6.3 | – |
| AA Intelligence Index | 32.0 | 42.5 |
| IFBench | – | 69.2% |
| AA-LCR | 76.7% | 81.7% |
| MMMU-Pro | – | 81.8% |
| AA-Omniscience | -3.7 | 20.4 |
| Terminal-Bench Hard | – | 62.1% |
| GPQA Diamond (AA) | – | 92.8% |
| Humanity's Last Exam (AA) | 35.7% | 46.0% |
| SciCode (AA) | 54.3% | 57.8% |
| τ²-Bench Telecom (AA) | – | 83.3% |
| EnigmaEval | – | 37.1% |
| ARC-AGI-1 | – | 97.0% |
| ARC-AGI-2 | – | 85.4% |
| ARC-AGI-3 | – | 2.2% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Claude Sonnet 5 vs GPT-5.6 Sol: questions
- Is Claude Sonnet 5 better than GPT-5.6 Sol?
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 61.4. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Sol (high) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Claude Sonnet 5 better than GPT-5.6 Sol for coding?
- GPT-5.6 Sol scores higher in coding (72 vs 62 on the category index, where 50 is average).
- Is Claude Sonnet 5 better than GPT-5.6 Sol for agentic tasks?
- GPT-5.6 Sol scores higher in agentic tasks (88 vs 62 on the category index, where 50 is average).
- Which is cheaper, Claude Sonnet 5 or GPT-5.6 Sol?
- Claude Sonnet 5 is cheaper: $4.00 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Sonnet 5 or GPT-5.6 Sol?
- Claude Sonnet 5 streams faster: 60 against 59 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.