Moonshot releases Kimi K3.1 Pro

Moonshot introduced Kimi K3.1 Pro today via the Kimi API, according to Simon Willison’s writeup. The model is not yet open weights, though Moonshot states that full model weights will be released by November 4, 2026.

Alongside the standard release, Moonshot is offering a “Highspeed” version of the model, which Willison reports runs two to three times faster than the standard variant. That speed comes at double the price, with one exception: input token cache hits are priced the same across both versions.

Willison’s post links to Moonshot’s own announcement and to the Kimi platform’s published US dollar pricing documentation for chat usage, though the provided material does not include the specific dollar figures themselves.

The release follows a now-familiar pattern among frontier labs of staging capability ahead of open weights, with Moonshot setting a specific near-term date for the fuller release rather than leaving the timeline open-ended. No benchmark results, architectural details, or comparisons to prior Kimi versions are included in the cited material.