DeepSeek V3.1Open Weight
Released
DeepSeek V3.1 is an AI model released by DeepSeek on Thursday, Aug 21 2025, 85 days after DeepSeek R1-0528. It is an open-weight model — the trained weights are available to download and run.
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Available from
| DeepInfra | $0.25 | $0.95 | 160K | fp4 |
|---|---|---|---|---|
| AtlasCloud | $0.30 | $0.95 | 128K | fp8 |
| Novita | $0.27 | $1.00 | 128K | fp8 |
| SiliconFlow | $0.27 | $1.00 | 160K | fp8 |
| CoreWeave | $0.55 | $1.65 | 160K | fp8 |
About
DeepSeek V3.1, released August 21, 2025, merged the V3 and R1 lines into a single hybrid model with switchable thinking and non-thinking modes, tuned for the agent era: stronger tool calling, better multi-step task execution, and faster reasoning than R1 at similar quality. As with every DeepSeek release, the weights were open.
It marked DeepSeek's shift from chasing benchmark parity toward practical agentic use, and was refined by V3.1 Terminus in September 2025 before the experimental V3.2 introduced sparse attention to cut long-context costs. The line ultimately led to the V4 generation in April 2026.
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Frequently asked questions
DeepSeek V3.1 was released by DeepSeek on Thursday, Aug 21 2025.