[Moon's Dark Side Open Sources Kimi K3.1 Pro Weights] Moon's Dark Side has released the open weights for Kimi K3.1 Pro on Hugging Face. According to the model card, Kimi K3.1 Pro is a native multimodal agent model using the MoE architecture, with a total of 2.8T parameters, 104B activation parameters, and a context length of approximately 1 million tokens. It is the first model in the K3.1 series. The weights are released in MXFP4 quantization (activation is MXFP8, using quantization-aware training). The official API is also open; developers can access it via platform.kimi.ai by selecting kimi-k3.1-pro, compatible with OpenAI and Anthropic interfaces. Previously, Moon's Dark Side released Kimi K3.1 Pro on October 24th and stated that the model weights would be open-sourced by November 4th.