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AI Research1 min reading time

Quoting Claude Opus 5 system prompt

Simon Willison's WeblogPublished Aug 9, 2026

Anthropic's Claude Fable 5 and Mythos 5 models were briefly suspended in June 2026 due to U.S. export controls, but access was restored after the controls were lifted. Claude's system prompt now includes accurate, neutral information about this event.

#anthropic #claude-fable-5 #claude-mythos-5 #export-controls #large-language-models #u-s-department-of-commerce

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