# Kimi K3.1 Pro released, claimed to beat Claude Opus 5.5 on Terminal-Bench 4.0

> Original title: Kimi K3.1 Pro is out!

- Source: Yuchen Jin
- Published: 2026-10-23T17:27:58.000Z
- Bad Influence: https://badinfluence.news/items/oxinxd4wlvun3m4yeoc87nfz8
- Original: https://x.com/Yuchenj_UW/status/2113683866330566766

## Summary

Yuchen Jin says Kimi K3.1 Pro is out and should now be the strongest open-source model. He claims it beats Claude Opus 5.5 on Terminal-Bench 4.0 at about one-third the cost.

## Post

Kimi K3.1 Pro is out!

should be the strongest OSS model now.

It beats Claude Opus 5.5 on Terminal-Bench 4.0 at ~1/3 the cost!

![](https://badinfluence.news/api/img-proxy?u=https%3A%2F%2Fpbs.twimg.com%2Fmedia%2FHVVP0p0bkAAiauR.jpg&mode=thumb&exp=1793836800&sig=a5191fa039862f89)