DeepSeek-V3.1 is a 671B-parameter hybrid reasoning model (37B active) with thinking and non-thinking modes selected through prompt templates. It extends DeepSeek-V3 with two-phase long-context training (up to 128K tokens) and uses FP8 microscaling for efficient inference. The model does well at tool use, code generation, and reasoning, with performance comparable to DeepSeek-R1 and faster responses. It supports structured tool calling, code agents, and search agents, which suits research and agentic workflows. It succeeds DeepSeek V3-0324.
Retired on Jan 27, 2026: requests to this model ID now return an error. These models are live and work with the same API key.
DeepSeek-V3.1 is a 671B-parameter hybrid reasoning model (37B active) with thinking and non-thinking modes selected through prompt templates. It extends DeepSeek-V3 with two-phase long-context training (up to 128K tokens) and uses FP8 microscaling for efficient inference.
No. DeepSeek Chat v3.1 (Free) was retired on NagaAI on Jan 27, 2026, and requests to it now return an error. Live models you can use instead with the same API key: DeepSeek V4.1 Flash 1017, DeepSeek V4.1 Flash 0910 and LFM3-1.7B.
It takes text as input and returns text.
