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 GPT-5OpenAI |  DeepSeek-V4-ProDeepSeek | GPT-5.5 OpenAI |  Gemini 2.5 Flash | |
|---|---|---|---|---|
| Vendor | OpenAI | DeepSeek | OpenAI | |
| Family | GPT | DeepSeek | GPT | Gemini |
| Release date | 2025-08-07 | 2026-04-22 | 2026-04-23 | — |
| Context window | 400,000 tokens | 1,000,000 tokens | 400,000 tokens | 1,000,000 tokens |
| Parameters | — | 1.6T (49B active) | — | — |
| Modality | text, vision, audio | text | text, vision, audio | text, vision, audio |
| License | proprietary | MIT | proprietary | proprietary |
| Source | proprietary | open weights | proprietary | proprietary |
| Description | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | 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. | 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. | — |
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