Overview
- Moonshot made Kimi K2 Thinking publicly available with open weights on Hugging Face, positioning it as an open-source reasoning model.
- Published results report higher scores than GPT-5 and Claude Sonnet 4.5 on hard tests, including 44.9 on Humanity’s Last Exam and 60.2 on BrowseComp.
- The model uses a Mixture-of-Experts design with roughly 1 trillion parameters and 384 experts, activating about 32 billion parameters at inference.
- Moonshot’s documentation and demonstrations highlight long-horizon tool use up to 200–300 sequential calls, including solving a PhD-level math problem and generating complex apps from a single prompt.
- Moonshot cites an estimated $4.6 million training cost reported to CNBC, raising commercial and geopolitical questions as independent verification and security reviews remain pending.