# Moonshot releases Kimi K3.1 Pro via API, with open weights promised by Nov 4

> Original title: Introducing Kimi K3.1 Pro

- Source: Simon Willison
- Published: 2026-10-23T19:40:54.000Z
- Bad Influence: https://badinfluence.news/items/bp8g8es5x2xe0u7i0cqfombnr
- Original: https://simonwillison.net/2026/Oct/23/kimi-k31-pro/

## Summary

Moonshot released Kimi K3.1 Pro on its API, with full weights promised by November 4, 2026. It is priced at $2.00 per million input tokens and $10 per million output tokens, and Artificial Analysis scored it 55, behind only Claude Opus 5.5 at 58. Simon Willison tested it with pelican-on-bicycle SVG prompts at three reasoning levels.

## Why it matters

The post pairs Moonshot's pricing and benchmark claims with Artificial Analysis scores and a hands-on API test, showing how a soon-to-be open-weight model ranks against frontier closed models.