Kimi K3.1 Pro: 3T-Class Open-Weight Model With 1M-Token Context

Key Info

Moonshot AI announced Kimi K3.1 Pro, described as its most capable 3T-class open-weight model, alongside a K3.1 Pro Highspeed variant that runs 2–3× faster. Both are available now on the Kimi platform, Kimi Work, Kimi Code, and the Kimi API, with open weights promised by Nov 4, 2026.

Highlights

• 1M-token context window; 2.8T total parameters with 104B active parameters in an MoE architecture; multimodal support.
• Positioned for full-project coding, including games built in Unreal, Unity, and Godot.
• Handles parametric 3D modeling in Blender and CAD.
• Claims a 65% reduction in hallucination for finance modeling work.
• Moonshot says it matches the strongest proprietary models on coding, agentic, and knowledge benchmarks.
• A full technical blog and API documentation are linked in the announcement.