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AI · September 23, 2025

DeepSeek-V3.1-Terminus

A refined agentic model for developers

DeepSeek-V3.1-Terminus launched on September 23, 2025 with 148 votes, #220 of 8,160 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.

What it does

DeepSeek-V3.1-Terminus is the latest update to the DeepSeek-V3.1 model. This "Terminus" version focuses on stability and refinement, fixing issues like language mixing and improving agent capabilities, while retaining the core strengths of the V3.1 series.

We’re on a journey to advance and democratize artificial intelligence through open source and open science.

The template and tool-set of search agent have been updated, which is shown in assets/search_tool_trajectory.html . The model structure of DeepSeek-V3.1-Terminus is the same as DeepSeek-V3. Please visit DeepSeek-V3 repo for more information about running this model locally. For the model's chat template other than search agent, please refer to the DeepSeek-V3.1 repo. Here we also provide an updated inference demo code in the inference folder to help the community get started with running our model and understand the details of model architecture. NOTE: In the current model checkpoint, the parameters of self_attn.o_proj do not conform to the UE8M0 FP8 scale data format. This is a known issue…from huggingface.co

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