Kimi K1.5

Kimi K1.5 was released by Moonshot AI on Monday, Jan 20 2025.

Kimi K1.5 was built by Moonshot AI. Chinese AI company building the Kimi family of models. Founded in 2023, known for long-context and efficient MoE architectures.

Kimi K1.5 has a context window of 128k. That is the maximum amount of input plus output the model can hold in a single request.

No. Kimi K1.5 is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

Moonshot AI's previous tracked release was Kimi Chat on Oct 9 2023, 469 days earlier. It was followed by Kimi-VL on Apr 10 2025.