Moonshot puts Kimi K3.1 Pro on the Kimi API
Original title: Introducing Kimi K3.1 Pro
Weights stay closed until a promised November 4 release; a faster tier costs twice as much.
Moonshot released Kimi K3.1 Pro on the Kimi API. It is not open weights; the company says full weights will be released by November 4, 2026. A Highspeed variant is described as 2-3x faster at twice the price, except for cached input tokens, which stay the same price. Listed pricing is $2 per million input tokens and $10 per million output tokens.
Unconfirmed: Parity with other models is Moonshot's own benchmark claim, and the Artificial Analysis comparison is truncated in the source.
- Input and output prices match GPT-6.1 Sol and are half of Claude Opus 5.5.
- Moonshot's benchmarks put Kimi roughly level with Opus 5.5 and GPT-6 Astra.
- Artificial Analysis scored Kimi at 55, ahead of Claude Fable 5.1 and GPT-6 Astra.
- Organizations
- MoonshotArtificial Analysis
- AI models
- Kimi K3.1 Pro
From the original article
Introducing Kimi K3. 1 Pro Kimi K3. 1 Pro landed on the Kimi API today - it's not yet open weights, but Moonshot promise "Full model weights will be released by Nov 4, 2026".
simonwillison.net
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