Six of the world’s biggest AI companies signed a voluntary safety agreement at the White House on September 29, promising to let outside auditors check their AI safety controls.

The “Joint Commitment on Frontier Responsibilities” was signed by Google’s Sundar Pichai, Anthropic’s Dario Amodei, Meta’s Mark Zuckerberg, Nvidia’s Jensen Huang, OpenAI president Greg Brockman and Elon Musk for xAI.

The one-page pact calls for four layers of protection: internal controls while training models, an internal team to check those controls, an independent external auditor, and a board committee to oversee fixes and receive reports.

President Trump called the deal “morally binding,” but it carries no legal penalties if a company falls short. A photo of the signed document even misspelled the “United States” as the “Unites States,” right under the president’s signature.

Notably absent from the signing were Microsoft, Amazon and Apple. Critics say their absence makes the accord a self-selected club rather than an industry-wide standard, since two of the three largest cloud providers sit outside the pledge.