Amazon’s security findings are said to have prompted the White House to impose a ban on Anthropic Fable.

According to reports, the recent export control measures that led to Anthropic restricting access to Fable 5 and Mythos 5 were influenced by cybersecurity research from Amazon and discussions between CEO Andy Jassy and the White House. The findings from Amazon indicated that Fable 5 could potentially provide information useful for cyberattacks through specific prompts. Amazon has not yet commented on this situation.

Following Jassy’s briefing of the government on these findings, a decision was made to prevent foreign nationals from using the technology. This situation is further complicated by the fact that many of Anthropic’s researchers are from abroad, effectively barring them from accessing their own work.

In response, Anthropic challenged the government’s portrayal of the situation as a “jailbreak,” asserting that similar vulnerabilities could be identified using other publicly available models, such as GPT 5.5. Some security experts seem to support Anthropic’s stance. Katie Moussouris, founder and CEO of LutaSecurity, stated on BlueSky that “I’ve seen the paper. It’s not a jailbreak.” Former Commerce Department official Kate Koren suggested that the White House’s negative view of Anthropic might have played a role in the decision.

Anthropic has had a contentious relationship with the previous administration due to its refusal to allow its AI to be used for mass surveillance or in lethal autonomous weapons. In February, the former president directed federal agencies to cease using Anthropic’s AI, and shortly after, the Secretary of Defense labeled the company as a supply chain risk.

While there had been some cooperation between the government and Anthropic to broaden access to Mythos, it appears that tensions are rising once again.