Moonshot AI

Kimi K-series open-weight models (K2 / K2.5 / K2.6 / K3)

Generally Available

Moonshot's open-weight frontier line: 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 (104B active; 16 of 896 experts) with 1M-token context, Kimi Delta Attention, Attention Residuals, and native text/image/video understanding, the largest open-weight model ever released.

Latest update Sep 14, 2026

Kimi K-series open-weight models (K2 / K2.5 / K2.6 / K3)

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Current status

K3 launched July 16, 2026 via the API and kimi.com, and its full open weights were released July 27, 2026 under a bespoke Kimi K3 License on Hugging Face - the largest open-weight model ever published. Hugging Face listed about 2.21 million K3 downloads in the trailing month as of September 14, 2026. Official platform docs still price K3 at $3/$15 per million tokens ($0.30 cache-hit) and list K2.7 Code at $0.95/$4 ($0.19 cache-hit) with a 256k context window. K2.6 and K2.7-Code weights remain live on Hugging Face.

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Specifications3

K3 Parameters
~2.8T total / 104B active

sparse MoE, 16 of 896 experts

K3 Context Window
1M tokens (1,048,576)
K2 Thinking Benchmarks

HLE 44.9% / BrowseComp 60.2% / SWE-Bench Verified 71.3%

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