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 DeepSeek-V3.1DeepSeek |  GPT-5 ProOpenAI | GPT-5.5 OpenAI |  Llama 4 ScoutMeta | |
|---|---|---|---|---|
| Vendor | DeepSeek | OpenAI | OpenAI | Meta |
| Family | DeepSeek | GPT | GPT | Llama |
| Release date | 2025-08-21 | 2025-08-07 | 2026-04-23 | 2025-04-05 |
| Context window | 128,000 tokens | 400,000 tokens | 400,000 tokens | 10,000,000 tokens |
| Parameters | 671B | — | — | 109B |
| Modality | text | text, vision, audio | text, vision, audio | text, vision |
| License | MIT | proprietary | proprietary | Llama 4 Community License |
| Source | open weights | proprietary | proprietary | open weights |
| Description | Large MoE open-weight model. Predecessor to DeepSeek-V4. | Higher-reasoning variant of GPT-5, used for harder scientific and research tasks (e.g., immunology breakthroughs at NIH). Same 400K context as GPT-5; trades latency for depth. | 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. | — |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | — | — | 87.6% | — |
| GPQA-D | — | — | 89.4% | — |
| HumanEval | — | — | 96.8% | — |
| Aider | — | — | 89.7% | — |
| AIME-25 | — | — | 94.2% | — |
| LiveCB | — | — | 78.9% | — |
| MMMU | — | — | 78.4% | — |
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