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 GPT-5.5OpenAI |  DeepSeek-V4-FlashDeepSeek |  Llama 4 MaverickMeta |  Mistral Large 2Mistral | |
|---|---|---|---|---|
| Vendor | OpenAI | DeepSeek | Meta | Mistral |
| Family | GPT | DeepSeek | Llama | Mistral |
| Release date | 2026-04-23 | 2026-04-22 | 2025-04-05 | 2024-07-24 |
| Context window | 400,000 tokens | 1,000,000 tokens | 1,000,000 tokens | 128,000 tokens |
| Parameters | — | 284B (13B active) | 400B | 123B |
| Modality | text, vision, audio | text | text, vision | text |
| License | proprietary | MIT | Llama 4 Community License | Mistral Research License |
| Source | proprietary | open weights | open weights | 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. | Smaller, faster sibling to DeepSeek-V4-Pro. Same 1M context window with a much lighter 284B / 13B-active MoE. | Mixture-of-experts open-weight model from Meta. | — |
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