Claude Sonnet 4.6 vs GPT-5.5
Head to head on 30 shared benchmarks, with price, context window, and release dates.
Benchmark scores
57evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Sonnet 4.6 Anthropic | 47.2% | 47.6% | 65.3% | 78.0% | 1207elo | 1805elo | 79.9 | 51.0% | 32.4% | 79.7% | 11.2% | 42.4% | 78.4% | 80.0% | 76.1% | 63.9% | 77.7% | 86.5% | 86.4% | 67.7% | 72.1% | 45.0% | 46.6% | 44.1% | 77.1% | 42.4% | 50.6% | 60.6% | 51.5% | 78.9% | 87.1% | - | - | 1.35 | - | - | - | - | - | - | - | - | - | 92.2% | - | - | - | - | - | 89.3 | - | - | - | - | - | - | 76.3 | 62.8% |
| GPT-5.5 OpenAI | 54.2% | 12.9% | 68.4% | 86.0% | 1315elo | 1844elo | 78.2 | 51.8% | 51.7% | 76.8% | 13.7% | 46.1% | 84.7% | 82.5% | 81.1% | 73.0% | 87.7% | 96.3% | 87.7% | 68.8% | 78.7% | 50.0% | 51.5% | 47.3% | 75.0% | 49.2% | 57.4% | 68.1% | 69.8% | 69.3% | - | 86.2% | 36.2% | - | 90.0% | 100.0% | 34.0% | 5.7% | 44.8% | 24.9% | 1769elo | 15.1% | 51.8% | - | 2.1% | 92.8% | 49.1% | 86.9% | 88.6% | - | 45.3% | 100.0% | 4.2 | 58.6% | 75.7% | 83.4% | - | 61.9% |
2 / 2 models
| Attribute | Claude Sonnet 4.6 Anthropic | GPT-5.5 OpenAI |
|---|---|---|
| Description | Claude Sonnet 4.6 is an AI model from Anthropic. | GPT-5.5 is an AI model from OpenAI. |
| Family | Claude | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 17 Feb 2026 | 23 Apr 2026 |
| Context | 1,000,000 | 1,050,000 |
| Input $/1M | $3.00 | $5.00 |
| Output $/1M | $15.00 | $30.00 |
| Cache read $/1M | $0.300 | $0.500 |
| Cache write $/1M | $3.750 | - |
| Speed | 45 tok/s | 0 tok/s |
| Latency | 1.12 s | 0.00 s |
| Modalities | text, image, file | file, image, text |
| Providers | - | - |
| Publisher | Anthropic | OpenAI |
| Reported scores | GPQA Diamond79.7% (AA) Humanity's Last Exam (HLE)11.2% (AA) IFBench42.4% (AA) SciCode44.1% (AA) τ²-bench (Tau²-bench)78.9% (AA) | GPQA Diamond76.8% (AA) Humanity's Last Exam (HLE)13.7% (AA) IFBench46.1% (AA) SciCode47.3% (AA) τ²-bench (Tau²-bench)69.3% (AA) |
FAQ
- Is Claude Sonnet 4.6 or GPT-5.5 better?
- Across the 30 benchmarks both models report on Sophon, GPT-5.5 leads on 25 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Sonnet 4.6 and GPT-5.5 compare on GPQA Diamond?
- Claude Sonnet 4.6 scores 79.7% and GPT-5.5 scores 76.8% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.6 or GPT-5.5?
- Claude Sonnet 4.6 is cheaper at $15.00 per million output tokens against $30.00 for GPT-5.5 - about 2.0x.
- When were Claude Sonnet 4.6 and GPT-5.5 released?
- Claude Sonnet 4.6 was released 17 Feb 2026 by Anthropic. GPT-5.5 was released 23 Apr 2026 by OpenAI.
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