Anthropic suspends access to Fable 5 and Mythos 5 AI tools: What actually happened

Anthropic has reportedly announced on Friday it is restricting its powerful new AI model, Fable 5 and Mythos 5, to adhere to export regulations after US authorities identified flaws within the system following its public release.

According to a statement published on its website, the company has barred foreign nationals from using Claude Fable 5- a newly introduced action that the company described as “too powerful” for public release.

The company reads: “The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.”

Prominent technology companies and the Trump administration are embroiled in collateral litigation over an order to stop government agencies from using the companies’ AI tools.

Upon receiving the information, Anthropic suddenly deactivated the models for all of its customers in order to ensure compliance but confirmed its other models would not be affected.

Claude Fable 5 is primarily a safeguarded version of Anthropic’s Claude Mythos engine-marking a major move for an AI program rivalling competitors OpenAI’s ChatGPT and Google’s Gemini.

It is worth mentioning that this major move comes just days after Anthropic announced Fable 5 and Mythos 5-two influential figures that the company touted as cutting-edge across multiple industry benchmarks.

This marks the first time that Anthropic has released such an advanced rollout in the wake of new safeguards that block responses in high-risk areas.

The company had initially deployed its restricted growth strategy as part of a cybersecurity initiative called Project Glasswing. Anthropic later analyzed that the government did not provide specific details about its national security concern before ordering the models to be completely disabled.

In this connection, Anthropic said: “As we have stated publicly, we believe the government should have the ability to block unsafe deployments, as part of a statutory process that is transparent, fair, clear, and grounded in technical facts.”

The major announcement marks Anthropic’s latest run-in with the US government following a high-stakes showdown with the Department of Defense revealed earlier this year.

When the negotiations between the two organizations collapsed, the DOD declared Anthropic a supply chain risk.

Additionally, the label has historically been reserved for foreign adversaries and requires defense contractors to validate that they will not use Anthropic’s Claude models in their work with the military.