Anthropic block puts OpenAI, Google and Meta on alert

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U.S. Anthropic block

Highlights

The U.S. ordered Anthropic to restrict foreign access to Fable 5 and Mythos 5.
The move followed concerns that model safeguards could be bypassed.
The case sets a possible precedent for OpenAI, Google, and Meta.
Zhipu shares jumped 33% as investors bet on Chinese AI alternatives.

According to Bloomberg, Anthropic disabled access to Claude Fable 5 and Claude Mythos 5 after receiving a U.S. government directive citing national security concerns and restricting foreign use of the models. The models had been released only days earlier, and Anthropic said the restrictions forced it to suspend access broadly rather than manage user-by-user limits.

Export controls reach AI models

The immediate concern was whether the models’ safeguards could be bypassed. Reports said U.S. officials were alarmed by evidence that Fable 5 could be manipulated to reveal software vulnerabilities, while Anthropic argued the response was disproportionate and that similar risks exist across advanced AI systems.

The order marks a sharp escalation in Washington’s approach. Earlier this month, the White House issued an executive order built around cooperation with frontier AI developers and cybersecurity agencies, including a voluntary framework for engagement before broader model releases. The Anthropic case suggests that voluntary cooperation can quickly give way to mandatory controls when officials believe a model creates a security risk.

Anthropic has sent senior technical staff to Washington to discuss the restrictions with government officials. The company is trying to resolve the specific concerns while avoiding a precedent that could slow future model launches across the industry.

Silicon Valley faces a new rulebook

The dispute comes at a sensitive moment for AI companies. Anthropic, OpenAI, Google, and Meta are racing to build more capable systems, while governments are struggling to decide how much control they should exert over models that can write code, find vulnerabilities, and support scientific research.

The concern is not only access to a chatbot. U.S. officials are increasingly focused on model weights, the underlying files that give advanced systems their capabilities. If those weights are stolen or copied by foreign adversaries, policymakers fear that rivals could replicate powerful AI systems without bearing the cost of developing them.

The case also plays into the U.S.-China AI race. Chinese AI company Zhipu surged 33% as Wall Street analysts raised bets that tighter U.S. controls could increase demand for domestic Chinese models. JPMorgan maintained an overweight rating and raised its target price on Zhipu from HK$950 to HK$1,400, citing the company’s model transparency and pricing position in a competitive market.

AI policy becomes market policy

The Anthropic block matters because it blurs the line between regulation, national security, and capital markets. The company is valued at more than $900 billion and is among the AI startups expected to pursue a public listing, making regulatory risk central to investor confidence.

For Silicon Valley, the message is clear: frontier AI companies may no longer control the timing, geography, or commercial rollout of their most capable models. If the U.S. applies similar controls to other developers, investors will have to price in a new risk that looks less like ordinary tech regulation and more like export control policy for chips or weapons systems.

We also reported that Anthropic warns of the risks of self-improving AI.

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