Yadnesh Salvi

Story · @simonw

Claude Opus 5 system prompt now covers the Fable export-control situation (@simonw)

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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.

In plain words

  • Anthropic added details about the Fable situation to the instructions that guide Claude Opus 5's answers.
  • Those instructions supply the artificial intelligence system with facts missing from the material used to train it.
  • The change lets people ask Claude about the Fable situation, even though it happened after its original training information ended.

Appeared in

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