# Moonshot Unveils Kimi K3.1 Pro, a 3T-Class Open-Weight Model With 1M-Token Context

*2026-10-23 18:01 UTC · AI · 1 min read*

> Moonshot says Kimi K3.1 Pro nears Claude Opus 5.5 on coding benchmarks, with full open weights due by November 4.

Moonshot AI has unveiled Kimi K3.1 Pro, which it calls its most capable "3T-class" open-weight model to date, with a 1 million-token context window. A faster K3.1 Pro Highspeed variant runs at 2-3x the speed. Both are available now on Kimi.ai, the Kimi apps, Kimi Code and the API; full weights are promised by November 4, 2026.

Moonshot reports 65.7% on Terminal-Bench 4.0 (Claude Opus 5.5: 66.4%, GPT-6 Astra: 58.2%) and 92.7% on BenchCAD with tools. Its claim-level hallucination rate on Kimi Hallu Bench Hard fell to 8.3% from 23.4% for K3. The figures are the company's own and not independently verified.

The release makes a frontier-scale model with downloadable weights a near-term prospect, though the license terms have not been published. Enterprise admins must enable access, which is off by default.

## Sources

- [kimi.ai](https://www.kimi.ai/blog/kimi-k3-1-pro)

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TechTools News · https://techtools.cz/tools/news/article/2568-moonshot-unveils-kimi-k3-1-pro-a-3t-class-open-weight-model-with-1m-token
Česká verze: https://techtools.cz/tools/news/clanek/2642-moonshot-predstavil-kimi-k3-1-pro-open-weight-model-tridy-3t-s-kontextem-1