DeepSeek-V3.1 vs GPT-5.6 Sol
Direct spec comparison of DeepSeek-V3.1 (from DeepSeek) and GPT-5.6 Sol (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 DeepSeek-V3.1DeepSeek |  GPT-5.6 SolOpenAI | |
|---|---|---|
| Vendor | DeepSeek | OpenAI |
| Family | DeepSeek | GPT |
| Release date | 2025-08-21 | 2026-06-26 |
| Context window | 128,000 tokens | — |
| Parameters | 671B | — |
| Modality | text | text, vision, audio |
| License | MIT | proprietary |
| Source | open weights | proprietary |
| Description | Large MoE open-weight model. Predecessor to DeepSeek-V4. | 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. |
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