Almost 200 Silicon Valley companies, including Proton and Y Combinator, are urging the Trump administration not to cut off access to Chinese open-weight artificial intelligence models or risk crippling the next generation of U.S. startups.

On Wednesday, the sent letters to President Donald Trump, Commerce Secretary Howard Lutnick and others in the administration with its appeal, marking the first coordinated effort by Silicon Valley’s wider influential startup community to weigh in on one of the Trump administration’s most closely watched AI debates. At issue: whether Washington should restrict access to increasingly powerful open-weight — meaning, AI models whose weights are publicly available — AI models released by Chinese companies such as Moonshot AI and Alibaba.

“American leadership requires two things: world-leading American open-weight models and continued access for U.S. builders to open models already available worldwide,” the startup founders wrote in , also sent to Office of Science and Technology Policy Director Michael Kratsios. Instead of broad prohibitions, they argue the government should adopt targeted safeguards…