Anthropic’s pre-IPO market value dropped after the U.S. government ordered it to stop access to its top AI models, Claude Fable 5 and Claude Mythos 5.
The order came because of national security worries about a reported jailbreak method, leading to an immediate shutdown and a fall in the value of Anthropic-linked trading contracts.
The government’s order bans foreign nationals from using the models and forced Anthropic to turn them off for everyone. Officials think they found a way to get around the models’ safety features.
Anthropic disagreed with how serious the concerns are, saying the weaknesses are limited and that other public AI systems have similar issues. The company warned that using these strict standards everywhere could slow down AI innovation across the industry.
The dispute has caught the attention of policymakers and tech leaders. David Sacks, a senior White House adviser, said Anthropic refused to fix the security issue even after the administration asked.
This controversy comes at an important time for Anthropic, a company known for focusing on AI safety. Investors are watching to see if the government will change its decision or add restrictions to other advanced AI models.
The result could have big effects on AI regulation, national security policy, and how advanced AI systems are developed in the future.
The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees.
The net effect of…
— Anthropic (@AnthropicAI) June 13, 2026
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