OpenAI claims to have found evidence that Chinese AI startup DeepSeek secretly used data produced by OpenAI’s technology to improve their own AI models, according to the Financial Times. If true, DeepSeek would be in violation of OpenAI’s terms of service. In a statement, the company said it is actively investigating.

OpenAI believes DeepSeek used a process called “distillation,” which helps make smaller AI models perform better by learning from larger ones.

Chinese artificial intelligence company DeepSeek disrupted Silicon Valley with the release of cheaply developed AI models that compete with flagship offerings from OpenAI — but the ChatGPT maker suspects they were built upon OpenAI data.