DeepSeek: deepseek-v3.1-terminus:free

A flagship Mixture-of-Experts (MoE) model released by DeepSeek on September 22, 2025. As the definitive update to the V3.1 series, "Terminus" (Latin for "end" or "boundary") focuses on refining multilingual consistency and eliminating character glitches reported in earlier builds. It represents the pinnacle of the Hybrid Reasoning Architecture, allowing users to toggle between "Thinking" and "Non-Thinking" modes within a single model. With significant post-training optimizations, it delivers the most stable and robust performance for Code and Search Agents within the V3 family, serving as a reliable production-grade foundation in early 2026.