Compare models
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 GPT-5.5OpenAI |  Claude 4.6 SonnetAnthropic |  DeepSeek-V4-ProDeepSeek | |
|---|---|---|---|
| Vendor | OpenAI | Anthropic | DeepSeek |
| Family | GPT | Claude | DeepSeek |
| Release date | 2026-04-23 | — | 2026-04-22 |
| Context window | 400,000 tokens | 200,000 tokens | 1,000,000 tokens |
| Parameters | — | — | 1.6T (49B active) |
| Modality | text, vision, audio | text, vision | text |
| License | proprietary | proprietary | MIT |
| Source | proprietary | proprietary | open weights |
| 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. | — | DeepSeek's flagship open-weight MoE. 1.6T parameters with 49B activated, 1M-token context, and a hybrid attention scheme (CSA + HCA) that delivers long-context inference at ~27% of V3.2's FLOPs. |
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