Kimi K-series open-weight models (K2 / K2.5 / K2.6 / K3)
Generally Available
Moonshot AI
Overview
Moonshot's open-weight frontier line under a modified MIT license: K2 (July 2025, 1T MoE), K2 Thinking (November 2025 agentic-benchmark leader), K2.5 (vision via MoonViT), K2.6, K2.7-Code, and K3 (July 16, 2026) — a ~2.8T-parameter MoE with 1M-token context and Kimi Delta Attention, the largest open-weight model ever released.
K3 launched July 16, 2026 via the API and kimi.com, with full open weights promised by late July; K2.6 and K2.7-Code weights are live on Hugging Face with 1M+ downloads each across the family.