StudioKimi K3.1 Pro Released: 3T-Class Open-Weight Model with 1M-Token Context, Weights by Nov 4
Original title: Kimi K3.1 Pro Tech Blog: Advancing Open Intelligence
Kimi introduced K3.1 Pro, the first model in its K3.1 series and its most capable 3T-class open-weight model to date, with a 1-million-token context window and substantial gains in coding, 3D creation, financial research, and agentic capabilities. It scores 65.7% on Terminal-Bench 4.0, ahead of GPT-6 Astra (58.2%) and just behind Claude Opus 5.5 (66.4%); a 2-3x faster K3.1 Pro Highspeed variant also launches. The model is available now on Kimi.ai, Kimi Work, Kimi Code, and the Kimi API, with full weights to be released by Nov 4, 2026. The blog also describes identifying and removing cyber-related data during training: on the internal xdev-bench-hard benchmark, an uncleaned checkpoint scores 90.5% at pass@3 versus 81.0% for the final model.
The official tech blog provides concrete benchmark scores, the open-weight timeline, and a detailed explanation of cyber-data removal, helping readers assess the model's real standing.
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