OpenAI says it has found evidence that Chinese artificial intelligence start-up DeepSeek used the US company’s proprietary models to train its own open-source competitor, as concerns grow over a potential breach of intellectual property.

OpenAI and Microsoft are probing whether DeepSeek used distillation to help train its rival reasoning model. President Trump expects to end birthright citizenship with support from Supreme Court 5 Tennis Superstars Who Are Into Golf as a Hobby ft.

DeepSeek built top-performing AI models using less-advanced chips at what it says is a fraction of the cost of rivals such as OpenAI.