Key Info

Moonshot introduced Kimi K3.1 Pro, described as its most capable 3T-class open-weight model, which nearly matches Opus 5.5 on Terminal-Bench 4.0 at roughly half the cost.

Highlights

  • 1M-token context window; 2.8T total / 104B active parameters in an MoE architecture, with multimodal support
  • Full-project coding across Unreal, Unity and Godot, plus parametric 3D modeling in Blender and CAD
  • Moonshot removed cyber data from mid-training and RL, deliberately cutting exploit-task performance by ~10% while coding and other capabilities kept improving
  • Positioned as near-Opus 5.5 performance at half the price