Cursor AI may be in material breach of contract with their new Composer model, which is generating buzz online for reportedly reaching Opus-level performance. It’s alleged that the new model is a fine-tuned checkpoint of Moonshot’s Kimi K2.5. If true, the original model is licensed under a modified MIT license containing a clause restricting commercial use by products with over 100 million monthly active users or more than $20 million (or equivalent) in monthly revenue. The requirement for triggering that clause is simply to prominently credit “Kimi K2.5” in the product or service’s UI. Cursor could now face serious PR and legal issues simply because they couldn’t be bothered to cite the underlying team’s work. This is open-source 101.... Talk about being hoisted by your own petard.
