Story · @simonw
Claude Opus 5 system prompt now covers the Fable export-control situation (@simonw)
X post · Story page
Simon Willison noticed the Claude Opus 5 system prompt includes details of the Fable export-control situation, so the model can field questions about events outside its knowledge cutoff. He links Anthropic's system-prompt release notes.
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Aug 10, 2026 · from X
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