The heads of OpenAI, Anthropic, Google DeepMind, and Microsoft AI signed a joint open letter to US Congress on June 5, 2026, calling for mandatory screening requirements on synthetic DNA providers.

According to a report, the letter warns that advances in AI are eroding the technical barriers previously needed to weaponize biological material. The signatories argue that synthetic DNA and RNA can currently be ordered online, and that AI now lowers the expertise threshold for their misuse.

What The Letter Says

The letter asks Congress to require biosecurity screening of all synthetic DNA providers operating in the United States. Existing voluntary frameworks cover some providers but leave gaps. The signatories say AI models capable of providing step-by-step guidance lower the barrier for bad actors.

They argue that the combination of accessible synthetic biology tools and powerful AI instruction creates a new risk class. The letter does not name a specific bill or propose draft legislative language. It positions the request as an urgent national security matter. Signing companies collectively develop the largest publicly available AI models in the world.

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The Broader Safety Context

The letter arrives the same week Anthropic published a separate safety paper proposing a coordinated global pause mechanism for AI development. Anthropic disclosed in that document that Claude wrote more than 80% of the code merged into its own production systems. That figure has circulated widely as an illustration of how fast AI capabilities are compounding.

OpenAI separately told CNBC it would comply with President Donald Trump's executive order requiring voluntary pre-release model reviews. Trump's order asks frontier AI developers to submit models for a 30-day federal safety check before release.

OpenAI's Head of Countries, George Osborne, confirmed compliance at SXSW London. The bioweapons letter and the compliance announcement both arrive in the same 24-hour window. The overlap makes June 5, 2026 an unusually active day for AI safety policy.

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Background

AI lab executives rarely issue joint statements. The last notable cross-company AI safety letter was the 2023 Future of Life Institute open letter calling for a pause in large-model training. That letter attracted hundreds of signatures but no legislative response. This week's letter is narrower in scope and targets a specific legislative gap rather than a general moratorium.

The Wall Street Journal reported earlier this week that corporate security chiefs were broadly unconcerned by the Trump executive order's voluntary structure. That indifference may have sharpened the labs' decision to send a more pointed request on biosecurity specifically.

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What Comes Next

The letter is a lobbying document, not legislation. Congress would need to introduce and pass a bill for any mandatory screening regime to take effect. The current Senate and House AI-focused caucuses have not responded publicly.

Anthropic's simultaneous push for a broader AI pause may complicate messaging. Critics have already called the pause proposal anticompetitive. The bioweapons letter is harder to dismiss on those grounds. It addresses a specific threat with a specific policy ask. Whether that distinction gives it more traction on Capitol Hill remains to be seen.

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