Agentic data science with the Data Agent Kit
cloud.google.com·7h ago
Data Science
Simon Willison's Blog·Aug 9·5 min read
Quoting Claude Opus 5 system prompt
TL;DR
Claude Opus 5, released alongside Claude Fable 5 and Claude Mythos 5, accurately acknowledges a temporary suspension of access due to U.S. export controls. Following the lifting of these controls, access was restored, and Claude provides factual updates without personal opinions.
✦ Why It Matters
Check Anthropic's site for the latest updates on model access and export controls.
Key Takeaways
- Monitor updates on AI model access from Anthropic.
- Understand the implications of export controls on AI deployment.
- Ensure compliance with U.S. regulations when using AI models.
- Utilize Claude's capabilities for accurate information on current events.
Full Summary
Claude Fable 5 and Claude Mythos 5, released on June 9, 2026, are AI models developed by Anthropic. Just three days later, access to these models was suspended to comply with U.S.
Department of Commerce export controls. After the controls were lifted on June 30, access was restored on July 1.
Claude, the AI behind these models, acknowledges the suspension and provides accurate information about it without personal opinions. It treats the export controls as a current political topic, offering a fair account and directing users to Anthropic's official statement for more details.
Claude's responses are based on the information available at its training cutoff, and it checks for updates when possible.