Kimi introduces K3.1 Pro, a 3T model with 1M context
Original title: Kimi K3.1 Pro and K3.1 Pro Highspeed
The model and a faster Highspeed variant are live in Kimi products now; full weights are promised by November 4.
Kimi announced Kimi K3.1 Pro, described as a post-trained 3T-class open-weight model with a 1-million-token context window, plus Kimi K3.1 Pro Highspeed at 2–3× the speed. Both are available on Kimi.ai, Kimi Work, Kimi Code, and the Kimi API. The company says full weights will be released by November 4 and cites its own coding, CAD, and finance scores against proprietary models. Those benchmark figures are the vendor’s claims.
Unconfirmed: Benchmark results and the November 4 weights date are stated by Kimi and are not independently confirmed here.
- Kimi says K3.1 Pro scores 65.7% on Terminal-Bench 4.0, versus 58.2% for GPT-6 Astra and 66.4% for Claude Opus 5.5.
- On internal Kimi Code Bench 3.0 Long-horizon, K3.1 Pro scores 61.2%, up from K3’s 55.95%.
- Vendor BenchCAD score with tools is 92.7%; OfficeQA Pro v2 is given as 64.4.
- On Kimi Hallu Bench Hard, the claimed claim-level hallucination rate fell from 23.4% for K3 to 8.3%.
- Vendors
- Kimi
From the original article
13 min read at kimi.ai
We're introducing Kimi K3. 1 Pro , the first model in our new K3. 1 series and our most capable 3T-class open-weight model to date, with a 1-million-token context window.
By Jowsey · kimi.ai
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