Kimi

Kimi is the model family from Moonshot AI, released as open weights and built especially for agent work. It's a very large mixture-of-experts model that has climbed to the top of the open-weight rankings, competing with the closed frontier on coding and reasoning.

The design leans toward tool use and long, multi-step tasks, which is why it comes up so often in agent conversations. You can use it at kimi.com or pull the weights from Hugging Face to run yourself. It's one of the clearest signs of how close open-weight models have gotten to the closed frontier.

It fits when you're building agents or tackling long, multi-step work and want an open-weight model tuned for exactly that. Its strength at tool use and coding makes it a real alternative to closed models for developer-heavy tasks.

The same open-Chinese-model notes apply: check the license for your use, and think about data governance if you go through the hosted version instead of self-hosting.