Claude Opus 5 system prompt documentation confirms that the model acknowledges the June 2026 suspension of access to Claude Fable 5 and Claude Mythos 5 under U.S. Department of Commerce export controls. The text notes these models were restored on 1 July 2026 after the controls were lifted. Because this knowledge comes from a notice added after the training data cutoff, the model treats the event as a current political topic rather than personal history. It directs users to Anthropic’s official statement for further details and checks for newer information if search capabilities are available.
This instruction highlights how LLMs handle time-sensitive regulatory events without hallucinating opinions or denying known facts. The system prompt explicitly prevents the model from sharing personal views on the suspension while maintaining accuracy about dates and status. It also ensures the AI suggests verifying information on the provider’s website when real-time data might have changed since the last update.
- Access suspended on 12 June 2026
- Restored on 1 July 2026
- Training cutoff occurred before these events
