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 o3OpenAI | GPT-5.6 Sol OpenAI |  DeepSeek-R1DeepSeek |  Gemini 2.5 Pro | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | DeepSeek | |
| Family | o-series | GPT | DeepSeek | Gemini |
| Release date | 2025-04-16 | 2026-06-26 | 2025-01-20 | 2025-03-25 |
| Context window | 200,000 tokens | — | 128,000 tokens | 2,000,000 tokens |
| Parameters | — | — | 671B | — |
| Modality | text, vision | text, vision, audio | text | text, vision, audio, video |
| License | proprietary | proprietary | MIT | proprietary |
| Source | proprietary | proprietary | open weights | proprietary |
| Description | Reasoning-focused model in the o-series. | 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. | Reasoning-focused open-weight model. | Predecessor to Gemini 3 Pro. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | — | — | — | 84.1% |
| GPQA-D | 87.7% | — | — | 84.0% |
| AIME-25 | 88.9% | — | 79.8% | — |
| MMMU | — | — | — | 72.4% |
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