Kimi K3.1 Pro launches on API, weights open in November
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On October 23, 2026, Moonshot launched its new model Kimi K3.1 Pro on the Kimi API, while promising to release the model's full weights by November 4, 2026. In addition to the standard version, a Highspeed version was also introduced, which is 2-3x faster than the standard version but twice as expensive, with cached-input pricing identical to the standard version. The event is currently at the stage of the model being live on the API, with weights pending release.
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- Simon WillisonSelectedIntroducing Kimi K3.1 Pro
Kimi K3.1 Pro launched on the Kimi API on October 23, 2026, and Moonshot has committed to releasing the full model weights before November 4, 2026. There is also a Highspeed version that is 2-3x faster at twice the price (with cache-hit input priced the same).
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