Moonshot publishes Kimi K2 Thinking: 1T parameters, 32B active, modified MIT, native INT4
Moonshot AI released Kimi K2 Thinking on Nov 6 with weights on Hugging Face: a mixture-of-experts model of 1T total parameters activating 32B per token, 384 routed experts with 8 selected plus one shared expert, 61 layers, MLA attention and a 256K context window. It is a native INT4 checkpoint — quantization-aware training applied to the MoE components in post-training — for roughly 2x generation speed and a smaller disk and VRAM footprint, and it runs on vLLM, SGLang and KTransformers behind an OpenAI and Anthropic-compatible API. The license is modified MIT: unrestricted commercial use except that products above 100M monthly active users or $20M monthly revenue must display Kimi K2 in the UI.
The self-reported numbers put an open download next to closed frontier models: 44.9% on Humanity's Last Exam with tools against GPT-5's 41.7%, 60.2% on BrowseComp against 54.9%, and 71.3% on SWE-bench Verified, with Moonshot claiming stable tool use across 200-300 sequential calls where earlier models drift after 30-50. CNBC reported the training bill at $4.6M from a source familiar with the matter, which it could not independently verify; Moonshot's CEO later said on Reddit that the figure is not official.

WHY IT MATTERS
Long-horizon agent traces are the expensive part of your bill — hundreds of tool calls, each carrying a growing context — and this is the first openly downloadable model sized for exactly that workload, with INT4 weights so the memory maths is survivable on hardware you own. The practical effect: you can put a frontier-adjacent agent loop behind an OpenAI-compatible endpoint, self-host or buy at open-model prices, and treat closed-API token pricing as a comparison rather than a constraint. The license clause bites only at hyperscale, so white-label use below 100M MAU is unaffected.
