Moonshot AI's Kimi K3.1 Model ID Appears on API Platform, Official Preview Hints 1M Token Context

On September 28, several developers noticed the model ID "kimi-k3-1" in the backend registry of Moonshot AI's API platform, and the identifier was accessible through API probing. Later that evening, the Kimi official open platform showed a preview for K3.1 or K3 11111, indicating support for a 1M-token context window. The model is expected to offer three reasoning intensity levels: Low, High, and Max, and may introduce Agent mode, Swarm multi-agent collaboration, as well as search and batch processing modes.

Some developers analyzed that the multi-tier reasoning design may correspond to different compute resource configurations and billing models. The Kimi open platform lists the API price of Kimi K3.1 as the same as the existing K3, though it may also be a placeholder. Moonshot AI is a company focused on AI large model development.