Anthropic’s pre-IPO shares fall as US government shuts down Fable, Mythos models

Jun 13, 2026 - 07:45
Anthropic’s pre-IPO shares fall as US government shuts down Fable, Mythos models
The government told Anthropic it had become aware of a method to bypass, or jailbreak, Fable 5. Anthropic reviewed the technique and said what it saw was narrow, not a universal jailbreak, and involved identifying a small number of previously known, minor vulnerabilities. It said other publicly available models, including OpenAI’s GPT-5.5, can find the...

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