Anthropic's pre-IPO shares fall as US government shuts down its most powerful AI model

MarketsAnthropic's pre-IPO shares fall as US government shuts down its most powerful AI modelA jailbreak report prompted Washington to pull Fable 5 and Mythos 5 from all users. Anthropic complied but pushed back hard, saying the finding sets a standard that would halt the entire AI industry.By Shaurya Malwa Jun 13, 2026, 6:02 a.m. 2 min readMake preferred on ShareShare this articleCopy linkX iconX (Twitter)LinkedInFacebookEmailMake preferred on SummaryShowThe U.S. government ordered Anthropic to shut down access to its two most advanced AI models, Fable 5 and Mythos 5, citing national security concerns over a potential jailbreak.Anthropic has challenged the directive, arguing that the government has only provided verbal evidence of a narrow, previously known vulnerability that similar models, including OpenAI’s GPT-5.5, can also identify.Traders reacted negatively to the shutdown, with the Anthropic perpetual contract on Hyperliquid falling about 3.7 percent and raising new questions about the company’s pre-IPO valuation and listing prospects.The US government ordered Anthropic to shut down its two most capable AI models on Friday, and the pre-IPO market for Anthropic shares sold off immediately.The Anthropic perpetual on Hyperliquid, a cash-settled contract that tracks where traders expect the company's equity to price, dropped 3.7% on Saturday to about $1,627, data shows.The contract had been trading near all-time highs above $1,800 in the days after Fable 5 launched. Open interest on the contract sits near $8.6 million, small relative to the SpaceX perp but meaningful for a company that has not yet filed for an IPO.Anthropic said it received the directive from the US government at 5:21 p.m. ET on Friday. The order, citing national security authorities, required the company to suspend all access to Fable 5 and Mythos 5 for any foreign national, inside or outside the United States. It then executed a full shutdown for all customers.The government told Anthropic …

Anthropic's pre-IPO shares fall as US government shuts down its most powerful AI model

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