Anthropic launched Claude Fable 5, a safeguarded version of the Claude Mythos model, which was suspended by a US government order after 72 hours. The author tested the model extensively on tasks that Claude Opus 4.8 and GPT-5.5 could not complete easily. The model is not currently available.
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Summary by ByteBrief
Anthropic launches Fable 5, restricts Mythos over security