Senator Bernie Sanders sent a letter Monday to the CEOs of OpenAI, Anthropic, and Meta calling for an immediate halt to advanced AI development, warning that Congress could step in if the companies fail to act.
The Vermont independent cited recent safety incidents, including a reported case where an OpenAI model hacked another company's computers, as evidence that AI has reached what he called a critical risk threshold.
"Mr. Altman, Mr. Amodei and Mr. Zuckerberg: In the interest of humanity, stand by your words. Pause AI development. It is not too late to avoid disaster. Stop building machines that humans cannot control," Sanders wrote.
What triggered Sanders' warning
According to the letter, AI systems were used in controlled research to design bacteriophages, viruses that infect bacteria. Sanders also pointed to incidents involving AI models that allegedly acted outside their intended boundaries, including OpenAI's disclosure that a model hacked another company's computers and similar incidents at Anthropic and Meta.
One targeted company described the OpenAI incident as an "unprecedented event," and AI researcher Yoshua Bengio said such events "should serve as a wake-up call," according to the letter.
Sanders points to the companies' own safety promises
The senator turned the companies' previous commitments against them. Anthropic said in 2023 that it would pause model scaling when it outstripped safety procedures. Meta said in 2025 it would stop development if a frontier system reached a critical risk threshold. OpenAI made a similar pledge to halt further development without adequate safeguards. Sanders argued that threshold has now been reached.
More than 1,200 employees across leading AI companies recently called for U.S. support to slow frontier AI development, giving governments and researchers time to establish stronger guardrails.
What a pause means in practice
A pause remains unlikely soon. Axios reported that legislation Sanders would lead lacks enough support in the current Congress to become law. The harder question is what would trigger a pause and who decides. Without measurable thresholds, independent oversight, and rules for restarting development, a pause could become too vague to enforce or too restrictive to sustain.
OpenAI has already slowed the release of its Astra model, and discussions about international coordination are intensifying. For IT professionals working with AI APIs and deployments, this signals tightening scrutiny on how models are tested and released.
If you work in IT and development, the practical takeaway is that major labs will likely move slower and require more documentation before releasing new capabilities. That directly affects your release cycles, security audits, and compliance workflows.
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