Chinese open-weight models are gaining steam against leading offerings from American companies. OpenAI and Anthropic did not sign the letter.

Nearly 200 US startups, including Y Combinator and Proton, warn a ban on Chinese open-weight AI would kill hundreds of them and hand the market to Anthropic.

Leading American technology firms have jointly endorsed open-weight artificial intelligence models. They believe this approach is crucial for maintaining United States leadership…

Letter explaining support comes amid rift over AI development philosophies and governance