Anthropic confirmed tonight that it has disabled access to Claude Fable 5 and Claude Mythos 5 to all customers, following an export control directive from the US government. Here are the details.

A bit of context

Earlier this week, Anthropic launched Claude Mythos 5 and Claude Fable 5.

Both models stemmed from Claude Mythos Preview, a highly advanced model intended for security research, which was capable of finding security bugs and flaws.

Access to Mythos Preview was initially limited to a small group of companies and research partners through Project Glasswing. In the weeks that followed, participants reported identifying and fixing numerous security issues with the model’s help. Mozilla alone said it resolved hundreds of vulnerabilities as a direct result of using Mythos Preview.