Kimi K3 Officially Open Source

According to DataBeat monitoring, the Dark Side of the Moon has officially open-sourced the Kimi K3 model weights, utilizing a custom Kimi K3 License that allows for research, deployment, fine-tuning, and secondary development. For model API service providers with an annual income exceeding $20 million, commercial use requires a separate commercial agreement with the Dark Side of the Moon.

Early access around K3 has already begun. Modal, Together AI, Nebius, GMI Cloud, Baseten, and Fireworks AI have all announced their intent to provide hosting or inference services on the day of the weight release.

The two major open-source inference frameworks, vLLM and SGLang, have also offered first-day support. Developers can deploy directly after receiving the weights, without the need to wait for framework adaptation. Subsequent optimizations will focus on running efficiency in long contexts, high throughput, and KDA linear attention.