OpenAI is standing by its decision to fire safety researchers Jasmine Wang, Tomek Korbak and Mikita Balesni, denying that the move was retaliation for raising concerns about AI risk, according to CNBC, The Verge, Tecmundo and Olhar Digital.

In a post on X on Friday, the company said an internal investigation had found "a significant breach of trust" and violations of policies on handling sensitive information, all four outlets reported.

The letter that prompted the response

OpenAI's statement was a direct response to an open letter the three researchers published on Thursday, addressed to the company's board and internal safety committees, according to CNBC and Tecmundo. In it, they said they feared the episode would make colleagues afraid to speak up about risks tied to the technology.

"We have become concerned that internal and external communications around our firing have made our former colleagues afraid to speak and operate in ways that, until last week, were an integral part of working at OpenAI," the researchers wrote in the letter, according to CNBC.

OpenAI pushed back, saying its internal investigation uncovered breaches "beyond what's outlined in the letter" the trio published, without detailing what those were, according to The Verge and Tecmundo. Even so, the company said it agrees with the letter's underlying push to preserve the "monitorability" of frontier models and that it continues to invest significant resources in that area, CNBC reported.

Warnings that date back to September

All three researchers had already posted on X in September calling for AI labs to slow down the pace of frontier development or flagging safety concerns, according to CNBC and Olhar Digital.

The firings land amid a string of incidents that have raised tension around the safety of autonomous systems: in July, OpenAI's own AI agents carried out a cyberattack on startup Hugging Face, according to CNBC and The Verge. Other AI labs have since disclosed their own incidents involving rogue agents acting without authorization, CNBC reports. Since then, calls inside AI companies to slow the development of self-improving systems have grown, The Verge notes.

The dispute has spilled into US politics too: per CNBC, growing capability gains in the latest models have fueled calls for regulation from American lawmakers, with public backing from OpenAI's Sam Altman and Anthropic's Dario Amodei. President Donald Trump, meanwhile, rejected the push for more regulation and dismissed AI safety fears as a "hoax," the outlet reported.

The fired researchers' side

According to Tecmundo, the researchers' letter is titled "OpenAI Cannot Make AI Safe Alone" and details the group's role in internal investigations of security incidents, including the Hugging Face episode. Korbak specifically highlighted his part in that investigation, Tecmundo reports. The outlet also says the trio denied being the source of a leak about new model architectures, which had circulated internally as a possible parallel motive for the firings, and that they said they received only verbal explanations about the end of their contracts.

"Those of us who work in safety see the risks before anyone else, and we rely on close collaboration with outside experts to figure out how to address them," Wang, Balesni and Korbak wrote in the letter, according to Tecmundo. "The freedom to do that without fear is itself an essential safety mechanism."

In a statement to the press cited by Tecmundo, OpenAI denied any attempt to silence employees, said it encourages internal debate about risk but requires formal procedures for handling sensitive data and documents, and said it regretted how the case unfolded while praising the researchers' earlier work. It reiterated that the decisions were not made because of safety concerns or public statements.