Kimi K3.1 Pro: a million-token context, with weights due November 4
Moonshot AI released a post-trained Kimi K3 for coding, agents and financial research through its API. You can’t self-host it yet.
On October 23, Moonshot AI made Kimi K3.1 Pro available through its API. It’s a post-trained version of Kimi K3, aimed at coding, agentic tasks, 3D workflows and financial research.
What’s new
- Context: 1 million tokens.
- Compatibility: there’s an OpenAI-compatible endpoint, so switching takes minimal code changes.
- Price: $2 per million input and $10 per million output tokens, as reported by Simon Willison.
- Quality: Moonshot reports gains over K3 on internal financial and business tests, and fewer fabricated claims on a stress test.
How to try it
The model is available in the Kimi API. Moonshot promises open weights on November 4, and self-hosting isn’t possible until then.
Limitations
Most of the numbers come from the company, and independent evidence is limited so far. The sources we could check don’t name a license for the upcoming weights, so don’t assume commercial use is allowed until they’re published.
Prepared with AI from public sources.