Definition
Plain language
A Chinese open-weight language model from Moonshot AI.
As stated in the literature
Moonshot AI's open-weight foundation model series, including Kimi-K2-Thinking and Kimi-CLI variants.
Also called: Kimi-K2-Thinking, Kimi-CLI, Kimi-K2.5
Why it matters: It widens the set of credible open-weight options outside the U.S. labs, affecting which models researchers can actually fine-tune and study.
For example, Kimi-K2-Thinking is one of the open-weight backbones researchers compare against Western frontier models on long reasoning tasks.
Heard on the show
“That 77% refusal is one model — Kimi K2 — and they picked it precisely because it's a notorious over-refuser.”Episode 216 — The AI Tutor That Gives Poor Kids a Thinner History