On November 4, 2026, Moonshot AI released the complete weights of Kimi K3.1 Pro — a 2.8-trillion-parameter Mixture-of-Experts model (104B active per token, 1M-token context). It is now the top open-weight model: 55 on the Artificial Analysis index and 65.7% on Terminal-Bench 4.0 (vs GPT-6 Astra 58.2%). API at $2/$10 per million tokens.
Key points
- Total parameters: 2.8 trillion (MoE); 104B active per token
- Context: 1,000,000 tokens
- Artificial Analysis Intelligence Index: 55 (rank 4, top open model)
- Terminal-Bench 4.0: 65.7% (beats GPT-6 Astra 58.2%)
- Weights released November 4, 2026; API $2/$10 per M in/out tokens
Full write-up: https://www.threerouter.com/blog/303
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