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 GPT-5.5OpenAI |  Claude 4.6 SonnetAnthropic | Claude 4.7 Opus Anthropic | |
|---|---|---|---|
| Vendor | OpenAI | Anthropic | Anthropic |
| Family | GPT | Claude | Claude |
| Release date | 2026-04-23 | 2026-02-17 | 2026-04-16 |
| Context window | 400,000 tokens | 1,000,000 tokens | 1,000,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision, audio | text, vision | text, vision |
| License | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary |
| Description | 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. | 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. | Anthropic's previous Opus flagship — superseded by Opus 4.8 on May 28, 2026 (42-day cycle). Optimized for complex reasoning and coding. Improved software engineering, long-running coding tasks, and higher-resolution vision over Claude 4.6. |
| Links | |||
| Benchmarks | |||
| MMLU-Pro | 87.6% | 85.4% | 88.2% |
| GPQA-D | 89.4% | 85.8% | 90.1% |
| HumanEval | 96.8% | 95.9% | 97.4% |
| Aider | 89.7% | 83.6% | 91.2% |
| AIME-25 | 94.2% | 87.4% | 93.5% |
| LiveCB | 78.9% | 73.8% | 80.2% |
| MMMU | 78.4% | — | 79.0% |
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