Kimi K3.1 Pro
Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model and a post-trained successor to Kimi K3, with a 1M-token context window.
Specifications
| Lab | Moonshot |
|---|---|
| Context window | 1M tokens |
| Input price | $2.00/1M |
| Output price | $10.00/1M |
| Release | Oct 2026 |
Strengths
- Open-weight flagship reasoning model post-trained on Kimi K3
- 1M-token context window for very long coding and agentic tasks
- Text, image, and video input with tool-use and structured-output support
- Adjustable reasoning effort for harder problems
Weaknesses
- Brand-new listing with limited independent benchmark coverage
- Flagship pricing well above the K2 family for high-volume use
Best for
- Long-horizon coding and agentic workflows
- Long-context codebase and document processing
- Multimodal analysis across text, images, and video
In Depth: Kimi K3.1 Pro
Summary
Kimi K3.1 Pro is an AI model from Moonshot.
Released in Oct 2026. It takes text, image, and video input and produces text output, with a context window of 1M tokens. Input pricing is $2.00 per 1M tokens and output is $10.00 per 1M tokens on OpenRouter.