Claude Opus 5.5 vs GPT-6 Sol
Claude Opus 5.5 
GPT-6 Sol Verdict
- Claude Opus 5.5 (thinking) leads on quality: 70.5 vs 67.7.
- Claude Opus 5.5 (thinking) is stronger in composite, knowledge, long context, multimodal.
- GPT-6 Sol (max) is 2.0× cheaper ($4.00 vs $8.00 per 1M blended).
- GPT-6 Sol (max) streams 2.5× faster (126 vs 50 tokens per second).
| Metric | Claude Opus 5.5 (thinking) | GPT-6 Sol (max) |
|---|---|---|
| BenchLeader Index | 70.5 | 67.7 |
| Composite score | 95.0 | 86.2 |
| Knowledge score | 84.4 | 75.4 |
| Long context score | 68.2 | 67.7 |
| Multimodal score | 71.7 | 67.1 |
| Reasoning score | 95.0 | 95.0 |
| Blended price $/M | $8.00 | $4.00 |
| Output speed | 50 tok/s | 126 tok/s |
| Time to first answer | 4.3 s | 107.2 s |
| Context window | 1M | 1.1M |
| AA Intelligence Index | 57.6 | 47.5 |
| AA-LCR | 84.7% | 83.7% |
| MMMU-Pro | 87.7% | 83.3% |
| AA-Omniscience | 46.4 | 27.1 |
| Humanity's Last Exam (AA) | 61.4% | 47.9% |
| SciCode (AA) | 66.9% | 57.6% |
| CritPt | 31.7% | 30.9% |
| GDPval (AA) | 67.3% | 49.4% |
| Terminal-Bench 4.0 (AA) | 59.6% | 43.9% |
| AutomationBench | 69.5% | 61.6% |
| GDP.pdf | 26.2% | 24.8% |
| MLCR | – | 16.1% |
| Harvey LAB | 91.2% | – |
| AA-Omniscience: accuracy | 66.2% | 54.5% |
| AA-Omniscience: non-hallucination | 41.4% | 39.9% |
| AA-Briefcase | 1822 | 1483 |
Data as of 2026-09-23. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 5.5 vs GPT-6 Sol: questions
- Is Claude Opus 5.5 better than GPT-6 Sol?
- Claude Opus 5.5 (thinking) leads on quality: 70.5 vs 67.7. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5.5 (thinking) is ahead overall as of 2026-09-23, but check the category scores for your use.
- Which is cheaper, Claude Opus 5.5 or GPT-6 Sol?
- GPT-6 Sol is cheaper: $4.00 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 5.5 or GPT-6 Sol?
- GPT-6 Sol streams faster: 126 against 50 output tokens per second.
- Which has the larger context window?
- GPT-6 Sol accepts more context: 1.1M against 1M tokens.