Kimi K2 used a janky modified MIT license that required large commercial entities to prominently display 'Kimi K2' in their user interface.

The K2 release in January used a modified MIT license whose only addition required prominent UI attribution for companies above 100M MAU or $20M monthly revenue. ✦ AI generated

Author · Simon Willison's Weblog · 2026-07-27 · original ↗

Kimi introduced their own janky modified version of the MIT license with K2 back in January. That license just added this paragraph requiring attribution beyond a certain size of commercial entity: Our only modification part is that, if the Software (or any derivative works thereof) is used for any of your commercial products or services that have more than 100 million monthly active users, or more than 20 million US dollars (or equivalent in other currencies) in monthly revenue, you shall prominently display 'Kimi K2' on the user interface of such product or service.

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