Kimi unveils K3.1 Pro, a 3T-class open-weight model with 1M-token context

Kimi announced K3.1 Pro, a 3T-class open-weight model with a 1M-token context window, alongside K3.1 Pro Highspeed. Full weights are promised by November 4, with results cited on Terminal-Bench 4.0, DeepSWE v1.1 and SWE-Marathon v1.1.

• 3T-class open-weight model with a 1M-token context window
• K3.1 Pro Highspeed launches alongside the base model
• Full weights promised for release by November 4
• Benchmarks cited include Terminal-Bench 4.0 and DeepSWE v1.1