The chipmaker and 36 other companies say defenders need AI they can run themselves. Major AI players OpenAI, Anthropic and Google are not among them.

Twenty-five companies signed a letter defending open models days after a Chinese AI helped Hugging Face survive a hack triggered by OpenAI.

Nvidia, Microsoft, Meta and 22 others signed an open letter defending open-weight AI, led by Jensen Huang's first tweet. OpenAI, Anthropic and Google didn't.