Kimi K2 ThinkingOpen Weight
Released
Kimi K2 Thinking is an AI model released by Moonshot AI on Thursday, Nov 6 2025, 7 days after Kimi Linear. It is an open-weight model — the trained weights are available to download and run. It is a 1T parameter model with a 256k token context window. Benchmark results (shown below) cover SWE-Bench Verified.
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About
Kimi K2 Thinking, released November 6, 2025, added a full reasoning mode to Moonshot's trillion-parameter K2 line and was billed for long-horizon agentic work: the model was trained to sustain hundreds of consecutive tool calls without human intervention, interleaving thinking with action across a 256K context window.
At release it posted the best agentic-search results of any open-weight model, including a leading score on Humanity's Last Exam with tools, and 71.3% on SWE-Bench Verified. Landing weeks before Claude Opus 4.5 and GPT-5.2, it made the strongest case yet that open weights could compete in the reasoning era. Kimi K2.5 followed in January 2026.
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Kimi K2 Thinking was released by Moonshot AI on Thursday, Nov 6 2025.