DeepSeek-V3.1-Terminus · DeepSeek · Model History

Claims and evidence

Released 22 September 2025 Primary source[1]page header 2025/09/22 [3]Date: 2025-09-22

Status AvailableWeights are still public on DeepSeek's Hugging Face organisation under the MIT License. In the DeepSeek API it was replaced by DeepSeek-V3.2-Exp on 2025-09-29; a temporary comparison endpoint served it until 2025-10-15 15:59 UTC. Primary source[2]License [3]Date: 2025-09-29 [4]
Replaced by DeepSeek-V3.2-ExpIn the DeepSeek API only: both API model names were upgraded to DeepSeek-V3.2-Exp; V3.1-Terminus stayed reachable on a temporary endpoint until 2025-10-15. The weights stay available. Primary source[3]Date: 2025-09-29 [4]

Revision of DeepSeek-V3.1DeepSeek presents it as an update of DeepSeek-V3.1 that keeps its capabilities while fixing reported issues. Primary source[1] [3]Date: 2025-09-22 [2]Introduction

Change · Languages Less mixing of Chinese and English and fewer occasional abnormal characters in output, according to DeepSeek.Compared with DeepSeek-V3.1 Primary source[3]Date: 2025-09-22
Change · Tool use DeepSeek reports better Code Agent and Search Agent performance; the search-agent template and tool set were updated.Compared with DeepSeek-V3.1 Primary source[2]Introduction [3]Date: 2025-09-22

Feature Reasoning modeThinking and non-thinking modes, served as deepseek-reasoner and deepseek-chat. Primary source[3]Date: 2025-09-22
Open weights YesMIT License for the repository and the weights. Primary source[1] [2]License
Access API, consumer app, Open-weights download Primary source[1]

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