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 DeepSeek-R1DeepSeek |  GPT-5.6 SolOpenAI | GPT-5 Pro OpenAI |  Grok 4xAI | |
|---|---|---|---|---|
| Vendor | DeepSeek | OpenAI | OpenAI | xAI |
| Family | DeepSeek | GPT | GPT | Grok |
| Release date | 2025-01-20 | 2026-06-26 | 2025-08-07 | 2025-07-09 |
| Context window | 128,000 tokens | — | 400,000 tokens | 256,000 tokens |
| Parameters | 671B | — | — | — |
| Modality | text | text, vision, audio | text, vision, audio | text |
| License | MIT | proprietary | proprietary | proprietary |
| Source | open weights | proprietary | proprietary | proprietary |
| Description | Reasoning-focused open-weight model. | Flagship of OpenAI's GPT-5.6 three-model suite (Sol / Terra / Luna), released as a limited preview. Strong gains in coding, cybersecurity, biology, and long-horizon agentic work. Pricing: $5 / $30 per million input/output tokens. | 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. | — |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | — | — | — | 82.8% |
| GPQA-D | — | — | — | 87.5% |
| Aider | — | — | — | 72.5% |
| AIME-25 | 79.8% | — | — | 86.1% |
| LiveCB | — | — | — | 65.3% |
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GPT-5.6 Sol✓
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