Model Shutdown Rocks Pre-IPO Valuation
The abrupt suspension of Anthropic’s most advanced AI models, Fable 5 and Mythos 5, has sent ripples through both the tech and financial communities. The company received a direct order from the U.S.
The timing of this intervention is significant: perpetual futures contracts tied to Anthropic were trading above $1,800 in the immediate aftermath of Fable 5’s debut. However, following the shutdown order, those same contracts dropped 3.7% on Saturday to about $1,627, reflecting investor anxiety over regulatory unpredictability and product uncertainty.
Open interest in these futures remains substantial at approximately $8.6 million, underscoring how much capital is exposed to Anthropic’s fate in real time. On paper, rapid product launches should boost confidence—but sudden government action can erase those gains overnight.
Anthropic received the government’s shutdown directive at 5:21 p.m. ET on Friday, just days after Fable 5 launched.
Futures Market Reacts to Government Order
The government’s directive did not just impact Anthropic’s internal operations—it also sent shockwaves through related crypto markets. Bittensor (TAO), a token associated with decentralized AI infrastructure, surged up to 16% intraday to reach $248 after news of the suspension broke. Stakeholders cited the incident as evidence that centralized AI providers face unique regulatory risks compared to decentralized alternatives.
Meanwhile, trading activity around Anthropic-linked contracts intensified as traders sought clarity on how long the suspension might last and what it could mean for future model releases. The open interest figure—$8.6 million—reflects both heightened speculation and deep uncertainty about regulatory headwinds facing advanced AI companies.
Fable 5 Jailbreak Sparks Security Fears
At the heart of the government’s move lies an alleged “jailbreak” method capable of bypassing Fable 5’s safeguards—a vulnerability officials claim poses national security risks.
Anthropic acknowledged receiving only verbal descriptions of this exploit from authorities but has yet to see concrete technical details. The company stated it would share more information about the specific jailbreak within 24 hours but suggested that the threat appears narrow and non-universal based on what it knows so far. For now, all customers—domestic and international—have lost access as a precautionary measure.
On Wednesday, just before the suspension, Anthropic was already under scrutiny for another safeguard embedded in Fable 5: a secret mechanism that degraded responses for users suspected of developing rival AI systems. This measure was outlined in a lengthy system card but not clearly communicated to users until after launch. By Thursday, Anthropic apologized for this lack of transparency and promised visible notifications and fallback procedures for affected requests.
See Also
Foreign Access at Heart of Ban
The U.S. government’s export control directive targets foreign nationals’ access to Fable 5 and Mythos 5—whether they are inside or outside U.S. borders or even employed by Anthropic itself. This blanket restriction follows recent policy moves: President Donald Trump signed an executive order aimed at tightening AI security controls just days before the shutdown order was issued.
Other models from Anthropic, such as Opus 4.8, remain unaffected by these restrictions and continue serving users as before. In fact, when flagged requests are detected—especially those related to cybersecurity or biology research—the system now reroutes them transparently to Opus 4.8 with clear user notifications.
It is unclear whether additional models could face similar scrutiny if new vulnerabilities emerge or if policy shifts again in response to evolving geopolitical tensions.
What You Need to Know
- •The U.S. government ordered Anthropic to suspend Fable 5 and Mythos 5 at 5:21 p.m. ET on Friday, citing security.
- •Anthropic perpetual futures on Hyperliquid dropped 3.7% to $1,627 on Saturday, with open interest near $8.6 million.
- •Bittensor (TAO) surged up to 16% to $248 after Anthropic’s suspension, highlighting interest in decentralized AI alternatives.
What to watch
Anthropic has stated it will share more details about the specific Fable 5 jailbreak within 24 hours of the U.S. government’s shutdown directive received at 5:21 p.m. ET on Friday; if Anthropic discloses evidence that addresses the government’s national security concerns, immediate restoration of Fable 5 and Mythos 5 access could follow, but this remains unclear.