Anthropic researcher quits, warning future AI could wipe out humanity, with senior colleagues publicly backing concerns.

He went from obscure AI researcher to notable independent AI critic literally overnight.

Former White House AI and Crypto Czar David Sacks accused ex-Anthropic researcher-turned-critic Jacob Coxon of running a coordinated publicity campaign this week, after Coxon canceled a planned interview hours before it was set to happen.

The development comes days after Anthropic researcher Jacob Coxon made headlines by resigning from the company and criticizing both Anthropic and rival OpenAI.

“AI developers believe their technology could cause human extinction,” one wrote in a social media post.

Several employees at both labs have publicly backed calls to slow AI development, citing fears of extinction from self-improving systems

Jacob Coxon tells TIME why he walked away from Anthropic—and why he fears the AI race is spinning out of control.

“Like many of you I think that without international coordination we will incur a risk of causing human extinction,” he wrote, according to NBC News.