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 Claude 4.6 SonnetAnthropic |  GPT-5.5OpenAI | |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Family | Claude | GPT |
| Release date | 2026-02-17 | 2026-04-23 |
| Context window | 1,000,000 tokens | 400,000 tokens |
| Parameters | — | — |
| Modality | text, vision | text, vision, audio |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | Anthropic's mid-tier flagship — released 12 days after Opus 4.6 and matching most of its capabilities at ~40% the API cost ($3/$15 per 1M tokens). 1M-token context. | OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning. |
| Links | ||
| Benchmarks | ||
| MMLU-Pro | 85.4% | 87.6% |
| GPQA-D | 85.8% | 89.4% |
| HumanEval | 95.9% | 96.8% |
| Aider | 83.6% | 89.7% |
| AIME-25 | 87.4% | 94.2% |
| LiveCB | 73.8% | 78.9% |
| MMMU | — | 78.4% |
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