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 GPT-5OpenAI |  DeepSeek-V4-ProDeepSeek | DeepSeek-V4-Flash DeepSeek | DeepSeek-R1 DeepSeek | |
|---|---|---|---|---|
| Vendor | OpenAI | DeepSeek | DeepSeek | DeepSeek |
| Family | GPT | DeepSeek | DeepSeek | DeepSeek |
| Release date | 2025-08-07 | 2026-04-22 | 2026-04-22 | 2025-01-20 |
| Context window | 400,000 tokens | 1,000,000 tokens | 1,000,000 tokens | 128,000 tokens |
| Parameters | — | 1.6T (49B active) | 284B (13B active) | 671B |
| Modality | text, vision, audio | text | text | text |
| License | proprietary | MIT | MIT | MIT |
| Source | proprietary | open weights | open weights | open weights |
| 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 Superseded by GPT-5.5 in April 2026.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. | Smaller, faster sibling to DeepSeek-V4-Pro. Same 1M context window with a much lighter 284B / 13B-active MoE. | Reasoning-focused open-weight model. |
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