Anthropic’s long-sidelined Fable 5 is greenlit to return

What happened

The company also published a blog post on Tuesday evening detailing the lead-up to the events in question, its revised safeguards, new AI industry processes it’s working on, and new ways it plans to share information with the government, as well as prerelease testing for upcoming models.

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The initial export control directive by the Trump administration came at an inopportune time for Anthropic, as it’s preparing for an IPO and has been feuding with the government for months over a supply chain risk designation.

” So it said it partnered with Amazon, Microsoft, Google, and other enterprises that are part of its Project Glasswing program in order to draft a widely-agreed-upon framework for assessing AI jailbreaks, with four proposed categories: capability gain for the attacker, breadth of capability gain for the attacker, ease of weaponization more broadly, and discoverability (or how easy it may be for someone else to repeat it).

Anthropic said it had also created a new team to “provide 24/7 monitoring of key jailbreak submission channels” and would also soon debut a HackerOne program for researchers to submit potential jailbreaks they have flagged for Fable 5.

Why it matters

In early June, Anthropic sidelined Fable 5 — its consumer-facing model built from the same underlying technology as Anthropic’s Mythos 5, but with more safeguards — after a Friday evening ultimatum from the Trump administration. , both the models that Anthropic had spent the last week hyping.

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The Trump administration recently green-lit the return of Mythos 5, but to a pre-approved list of organizations only. Non-US members of those organizations, as well as Anthropic’s own foreign national employees, were allowed to regain access the model. 6, which the Trump administration only allowed to debut under similar rules: a staggered rollout, initially to only a pre-approved list of organizations and government departments.

On Tuesday, Anthropic wrote that the company will “continue to coordinate with the government to expand access to the broader set of domestic and international partners” for Mythos 5.

The company also included an entire section in its blog post on its new plan for working closely with the Trump administration — highlighting its many attempts to get back in the government’s good graces after months of public drama, lawsuits, and presidential action.

The company wrote that it plans to offer “pre‑release government access and evaluation,” particularly for models relevant to national security capabilities, so that government partners can run independent evaluations about the models’ capabilities and test guardrails before broader release. ”

What to watch

Anthropic also included a disclaimer in its blog post, writing that “it is probably impossible to make any AI model fully robust (that is, impervious) to jailbreaks. ”

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