Kimi K3.1 Pro is Moonshot AI's newest open-weight flagship and the first model in the K3.1 series. It is post-trained from Kimi K3 for long-horizon coding, agentic workflows, and knowledge work, keeps K3's multimodal input and 1M-token context window, and reasons by default with an adjustable thinking effort.
Pick it over Kimi K3 for agent loops and large-repository work: it is built to sustain multi-step tool use and iterate against images, logs, tests, and runtime feedback. For a fully end-to-end encrypted session on the same model, choose Kimi K3.1 Pro (Private via TEE).
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