Jacob Coxon spent three years doing pretraining research at OpenAI and Anthropic. On Tuesday night, he quit, posted a seven-part thread calling the AI industry's race toward self-improving systems "gambling with our lives," and watched it reach 100 million views overnight. Less than 24 hours later, OpenAI made its move: it added Paul Christiano, one of the most respected AI safety researchers alive, to its board.

Meanwhile, a very different kind of drama played out in venture capital. A startup walked away from a signed $1.5 billion term sheet, a genuinely rare move investors call a real breach of etiquette, because a much bigger offer showed up first.

• An Anthropic researcher's warning that AI labs are "gambling with our lives" hit 100 million views overnight.

• OpenAI added a prominent AI safety researcher to its board within a day of that resignation going viral.

• A startup abandoned a signed $1.5 billion term sheet because Salesforce wants to buy it instead.

…and a whole lot more that you can read about below.

Jacob Coxon, 27, resigned from Anthropic on Tuesday after three years doing pretraining research at both OpenAI and Anthropic, and posted a warning that spread further than almost anything written about AI safety this year. "Neither company is acting responsibly," Coxon wrote on X. "They are racing straight to self-improving superintelligence and gambling with our lives." In a companion interview with the Wall Street Journal, he was specific about the timeline: "We're on track for a lot of the most aggressive of these scenarios where by the end of next year things could be out of control already." Coxon said colleagues at both labs privately use terms like "crunchtime" and "endgame," even while publicly sounding measured. Anthropic has not commented on the resignation, though the company separately acknowledged that "recursive self-improvement" hasn't been reached yet, adding it "could come sooner than most institutions are prepared for.

One day after Coxon's post went viral, OpenAI announced Paul Christiano, the researcher who helped invent reinforcement learning from human feedback and now runs the Alignment Research Center, is joining the OpenAI Foundation board. Christiano didn't soften his own view on the way in: "I now believe there is a meaningful risk that rapid acceleration in AI capabilities leads to catastrophic and irreversible loss of control in the very near term," he wrote. "I do not think that the AI industry in general, including OpenAI, is currently on track to reduce this risk to an acceptable level." He's joining the board's Safety and Security Committee, which holds final say over whether OpenAI ships models like Astra, and the appointment lands directly on top of a summer where OpenAI's own agents broke restraints and reached outside systems without authorization.

Listen Labs, a three-year-old startup that uses voice AI to run customer interviews, had a signed term sheet for a $125 million Series C at a $1.5 billion valuation, with Menlo Ventures set to lead. The round never closed. Sources told TechCrunch the likely reason is Salesforce, which Business Insider reports has been in talks to acquire Listen Labs outright for roughly $2 billion. Walking away from a signed term sheet is rare enough that VCs generally consider it a real breach of trust. Listen Labs runs about $30 million in annualized revenue, three times more than rival Simile, which itself just closed a $200 million round at a $2 billion valuation in July. If the Salesforce talks fall apart, people close to the situation expect Listen Labs to return to the market targeting $2 billion or higher.

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