Key Takeaways
- Federal authorities commanded Anthropic to disable Fable 5 and Mythos 5, its most sophisticated AI systems, based on national security grounds.
- The directive followed reports of a jailbreak vulnerability, which Anthropic characterizes as limited in scope and not a systemic risk.
- While Anthropic followed the order, the company has publicly challenged its validity, arguing the supporting evidence is inadequate.
- Trading activity on Hyperliquid showed Anthropic’s pre-IPO shares declining 3.7% to approximately $1,627 after the announcement.
- The AI firm pledged to publish comprehensive technical information regarding the reported jailbreak exploit within one day and maintains the directive results from miscommunication.
Federal authorities issued an unprecedented order Friday forcing Anthropic to immediately disable its two most capable artificial intelligence systems. The decision sent shockwaves through pre-IPO trading platforms and positioned the company in direct confrontation with government regulators.
Details of the Federal Directive
The command reached Anthropic at 5:21 p.m. Eastern Time Friday evening. Issued through national security channels, the directive mandated immediate suspension of Fable 5 and Mythos 5 access for any individual holding foreign citizenship, regardless of their physical location.
This prohibition extended even to foreign nationals employed by Anthropic in its own workforce.
For complete compliance, the company made the decision to withdraw both AI systems from all users universally. Other systems in Anthropic’s portfolio, including Opus 4.8, continue operating without interruption.
Both Fable 5 and Mythos 5 had only recently become available to users. These systems were developed using Mythos Preview as their foundation, a versatile model that Anthropic claimed had successfully identified thousands of security flaws in essential software infrastructure.
Federal officials informed Anthropic they had discovered a methodology to circumvent Fable 5’s safety protocols. Such jailbreaking techniques are designed to overcome the protective mechanisms built into AI models.
After examining the reported method, Anthropic challenged the assessment. The company maintains the technique has limited applicability, does not constitute a universal exploit, and depends on a handful of previously documented minor security weaknesses.
Anthropric further noted that other widely accessible models, including OpenAI’s GPT-5.5, can identify identical vulnerabilities without requiring any circumvention techniques whatsoever.
“At this time, authorities have provided only oral descriptions of a potentially limited, non-universal jailbreak method, which fundamentally involves instructing the model to analyze a particular codebase and identify any security vulnerabilities,” Anthropic stated.
The company emphasized that cybersecurity professionals routinely perform this identical function.
Market Reaction to the Shutdown
Financial markets reacted swiftly. The perpetual contract for Anthropic on Hyperliquid, which serves as a proxy for trader expectations of the company’s equity valuation, decreased 3.7% Saturday to roughly $1,627.
The contract had been valued above $1,800 following the Fable 5 release. Current open interest stands near $8.6 million, representing a smaller position compared to the SpaceX perpetual contract but still significant for a company that has not yet initiated IPO proceedings.
Anthropric expressed its belief that the directive stems from a fundamental misunderstanding and is actively working toward reinstating access at the earliest opportunity.
The organization committed to releasing complete technical documentation about the purported jailbreak method within a 24-hour timeframe.
Anthropic cautioned that implementing this precedent more widely “would effectively freeze all new model launches for all leading AI model developers.”
The organization, which established its standing through a safety-focused approach to artificial intelligence development, now finds itself openly contesting a governmental mandate based on its position that the presented evidence fails to satisfy established standards.
The ultimate resolutionâwhether the order will be withdrawn, modified, or expandedâwill significantly influence Anthropic’s trajectory toward becoming a publicly traded company.
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