The move follows a White House order issued two weeks ago directing another AI company, Anthropic, to block foreign nationals from accessing its Fable 5 and Mythos 5 models over national security concerns.

After Anthropic, US now limits OpenAI's latest powerful AI model to domestic users

Anthopic’s Mythos model is particularly adept at detecting software vulnerabilities, some of which remained undiscovered for decades. It has been used by US authorities and select companies to plug security gaps. The US believes such AI could become a dangerous cyberweapon in the wrong hands.

US restricts access of Anthropic’s Mythos and Fable to Americans only. Is globalisation dead in the age of AI?

Anthropic has launched Claude Fable 5, bringing Mythos-class AI to the public with strict safety guardrails. The model delivers advanced coding, reasoning and analysis capabilities while limiting access to high-risk areas such as cybersecurity and biology.


‘Despite safety concerns’: Why is Anthropic’s ‘dangerous’ Mythos AI now available to the public through Claude Fable 5?

Claude Mythos and Fable 5 are Anthropic's most powerful models ever, but classifier-based CBRN guardrails ensure they cannot provide nuclear or chemical weapons uplift. Here's how the system works.

Can Claude Mythos build a nuclear bomb? Inside Anthropic's hard chemistry guardrails

Anthropic's Claude Fable 5, the public version of its powerful Mythos-class AI model, is now live with 80.3% SWE-Bench Pro score, safety guardrails, and pricing at $10/million input tokens.

From Mythos to reality: Anthropic launches Claude Fable 5, its most powerful public AI model

Anthropic launches Claude Fable 5, bringing advanced AI capabilities from Mythos to wider users with built-in safety controls. The model excels in coding, analysis and automation, but higher costs and strict limits highlight growing focus on responsible AI use.

Anthropic launches Claude Fable 5: How it could change the way people work

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After Anthropic, US now limits OpenAI's latest powerful AI model to domestic users

US restricts access of Anthropic’s Mythos and Fable. Is globalisation dead?

Claude Fable 5 vs Mythos: What's changed and why it matters

Can Claude Mythos help build a nuclear bomb? Here's the answer

Anthropic's Mythos-class Claude Fable 5 is now public

Anthropic launches Claude Fable 5: How it could change the way people work