Skip to content
EVENT / TOPICHistorical

Moonshot launches Kimi K3.1 Pro model and API

1 reports1 sources10/23/2026 updated

Current overview (not historical)

AI overview

Moonshot has released the Kimi K3.1 Pro model and launched its API. The model is currently not open-weight, with full model weights planned to be released on November 4, 2026. A Highspeed version is available, offering input and output token prices of $2.00 and $10.00 per million tokens respectively, with speed improvements of 2-3 times. The model supports a context length of 300,000 tokens.

Written with AI from the reporting · updated 10/23/2026

Latest developmentOct 24, 03:40
Moonshot releases Kimi K3.1 Pro with promise of open weights by November 4, 2026
Explore the timeline, relations and evidence
Expand the detailed fact route and sources

Story route

A station-by-station route from the first public evidence onward; every station carries its own evidence and uncertainty.

  1. 1Unclassified fact stationOct 23, 00:00recorded Oct 24, 04:16single sourcerevised

    Kimi K3.1 Pro 上线 Moonshot API

    Read original source ↗ Simon WillisonReplay this moment in the explorer
    Evidence & revisions · 1 source records
    Subject：
    kimi
    Action：
    上线 K3.1 Pro 模型并提供 Highspeed 版本
    Object：
    Moonshot API
    Occurred (fact side)：
    Oct 23, 00:00
    Simon Willison ↗Report pageRevision 2 · currently revised
    Published (valid side)：
    Oct 24, 03:40
    First seen (known side)：
    Oct 24, 04:16
    Fact stationSingle source · one-sided claimRevised

    Copy may have been revised later; time replay is bounded. Layer labels group reading only, not causation between layers.

Uncertainty marks flag where to check the sources; they are not proven causation.

Report timeline

Explore every side through dated source reports.

Oct 24
  1. Simon WillisonRelated fact: single sourceSource report revised
    Moonshot releases Kimi K3.1 Pro with promise of open weights by November 4, 2026

    Report first recorded Oct 24, 04:16

    Kimi K3.1 Pro landed on the Kimi API on October 23, 2026. While not yet open weights, Moonshot promises full model weights will be released by November 4, 2026. A 'Highspeed' version is also available, offering 2-3x faster speed at twice the price (input token cache hits remain the same price). US dollar pricing is $2.00/million tokens for input and $10/million for output, matching GPT-6.1 Sol and half the price of Claude Opus 5.5. Moonshot benchmarks place Kimi level with Opus 5.5 and GPT-6 Astra, and Artificial Analysis scored Kimi at 55, ahead of Claude Fable 5.1, GPT-6 Astra, and Gemini 4 Argon (all at 53), making it the first time a soon-to-be open weight model scored this highly against frontier models.

    Read original source ↗

Event discussion

Reader opinions are hosted on GitHub Discussions; posting requires a GitHub account. Comments are not verified facts.

Open GitHub Discussions