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 GPT-5.5OpenAI |  Llama 4 MaverickMeta |  Gemini 2.5 Pro | GPT-5 OpenAI | |
|---|---|---|---|---|
| Vendor | OpenAI | Meta | OpenAI | |
| Family | GPT | Llama | Gemini | GPT |
| Release date | 2026-04-23 | 2025-04-05 | 2025-03-25 | 2025-08-07 |
| Context window | 400,000 tokens | 1,000,000 tokens | 2,000,000 tokens | 400,000 tokens |
| Parameters | — | 400B | — | — |
| Modality | text, vision, audio | text, vision | text, vision, audio, video | text, vision, audio |
| License | proprietary | Llama 4 Community License | proprietary | proprietary |
| Source | proprietary | open weights | 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. | Mixture-of-experts open-weight model from Meta. | Predecessor to Gemini 3 Pro. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. |
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