Hybrid Thinking: a first step into the agent era

DeepSeek-V3.1 arrived with 128K context and 671B parameters, introducing hybrid thinking for the first time — a single model supporting both thinking and non-thinking modes without switching, plus integrated tool calls. Liang Wenfeng said: “This is our first step toward the agent era.” The model could undertake long, complex reasoning while delivering decisive non-reasoning responses when invoking tools. This “one mind, two faces” capability lets developers build more autonomous AI workflows on a single endpoint. Beyond a fresh round of benchmark contests, this engineering breakthrough has longer-term significance: it compresses the cost of switching between reasoning and acting into the architecture itself.