Claude Opus 5 given special instructions on US export controls

The revealed system prompt of Claude Opus 5 contains specific instructions for accurately responding to questions about events related to US Department of Commerce export controls. Claude Fable 5 and Mythos 5 models were launched on June 9, suspended on June 12 for regulatory compliance, with access restored on July 1 after controls were lifted on June 30. Claude was instructed to confirm these events factually and not deny them, treating the issue as a typical current political topic.