BREAKING
Anthropic Halts Fable 5, Mythos 5
How the shutdown unfolded
1
Models launch June 9
↓
2
US order June 12
↓
3
All access disabled
↓
4
Talks set Monday
Two models in Mythos-class
Fable 5
general
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Added safeguards
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Blocks bio and cyber risk
Mythos 5
partners
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Less restricted
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Trusted partners only
SWE-Bench Pro coding scores
Fable 5
80.3
Opus 4.8
69.2
GPT-5.5
58.6
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Monday talks to decide next steps
AI NEWS BLITZ
Anthropic has worldwide halted its two newest AI models on a US government order.