DeepSeek-v3.1-Terminus (api-docs.deepseek.com)

DeepSeek-V3.1-Terminus is an incremental but focused update to DeepSeek v3.1 that tackles user-reported issues and tightens agent performance. The release reduces noisy bilingual artifacts (fewer CN/EN mix-ups and stray characters), strengthens the Code Agent and Search Agent, and delivers more stable, reliable outputs across benchmarks versus the prior v3.1. The model and service are available on App, Web and API, and the weights are open-source on Hugging Face (deepseek-ai/DeepSeek-V3.1-Terminus). For the AI/ML community this matters because it improves robustness and utility for real-world workflows: better language consistency reduces post-processing overhead for multilingual applications, upgraded Code and Search agents mean stronger program synthesis and retrieval-assisted tasks, and benchmark stability signals fewer regression risks when integrating the model into production or research pipelines. Open-source weights enable replication, fine-tuning and security auditing by practitioners, accelerating adoption and community-driven improvements while providing a straightforward path to evaluate performance on custom datasets.