STORY · MODELLER_
Quotes from Claude Opus 5 system prompt revealed
Simon Willison has published quotes from Claude Opus 5 model's system prompt. The prompt contains instructions on how Claude should handle questions about export controls that temporarily blocked Claude Fable 5 and Claude Mythos 5 from June to July 2026.
WHY IT MATTERS
System prompts are normally not public, so insight into how Anthropic instructs its models to handle sensitive political events and potential inaccuracies is relevant for understanding model behavior.
SOURCES
MACHINE-GENERATED SUMMARY This summary is written by machine from the sources below. We sort and explain — but we are a way into the field, not the final word. Check the source when something matters to you.