Anthropic wins approval to restore Claude Fable 5 after Trump ban

Key takeaway

• Anthropic has won government approval to restore its Claude Fable 5 and Mythos 5 AI models after a June ban over jailbreak risks.

• The company will relaunch Fable 5 globally while Mythos 5 rolls out to pre-approved organizations first, matching restrictions the Trump administration placed on OpenAI's GPT-5.6.

• Anthropic has installed new safety measures that block the flagged jailbreak technique in over 99% of cases and committed to closer government coordination on future model releases.

3 Key Points

FAQ

When will Fable 5 be available again?

Anthropic will begin restoring access to Fable 5 tomorrow on Claude platforms globally. Access on AWS, Google Cloud, and Microsoft Foundry will be re-enabled soon, but the company has not set a specific timeline.

Why was Fable 5 banned in the first place?

The Trump administration issued an export control directive in early June citing concerns over potential jailbreaks of the technology. Amazon researchers had flagged a specific jailbreak technique that was largely responsible for triggering the directive, which initially barred any foreign national—including non-U.S. members of enterprise client companies and many of Anthropic's own employees—from accessing either Mythos 5 or Fable 5.

What safeguards has Anthropic put in place?

Anthropic has trained an improved safety classifier that blocks the specific jailbreak technique described in the Amazon report in over 99% of cases. The company has also created a new team to provide 24/7 monitoring of key jailbreak submission channels and will debut a HackerOne program for researchers to submit potential jailbreaks.