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Kimi K2 Open-Source Release

Date: July 12, 2025
Company: Moonshot AI
Category: Models & Research

Narrative

1 trillion parameter MoE model with 32B active parameters. Open-sourced under modified MIT license. Top open-source model on LMSYS Arena. Trained on 15.5T tokens with novel MuonClip optimizer.

Moonshot AI

Reality

Ranked #1 open-source and #5 overall on LMSYS Arena with 3,000+ votes. SWE-Bench Verified 65.8% surpassed GPT-4.1 (54.6%). Most downloaded model on HuggingFace day after release. GPQA Diamond 75.1%.

Implication

Largest open-source MoE model at time of release. MuonClip optimizer achieved zero training instabilities across 15.5T tokens — engineering milestone. Cemented Chinese open-source AI as genuine frontier competitor.

Tags

  • moonshot
  • model-release
  • open-source
  • coding
  • agents