The tech giant’s security researchers saw an unidentified group they believe could be tied to DeepSeek use OpenAI’s API to obtain a large amount of data last fall, sources told Bloomberg. (Bloomberg)

Talking point: Companies can use OpenAI’s API, code that lets programs communicate with each other, to power applications with its generative technology. But it also lets users see how its leading models like o1 or GPT-4o respond to particular prompts or queries. Competitors can use those outputs to train or refine their own competing systems, a process called distillation. Investor David Sacks, U.S. President Donald Trump’s AI czar, has accused DeepSeek of using that technique to train its models, which perform on par with leading U.S. ones. Distillation violates OpenAI’s terms of service.