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Luu, T.J.

Quoting Claude Opus 5 system prompt

infonewsLLM-Specific

safety

Source: Simon Willison's WeblogAugust 9, 2026

Summary

Claude Opus 5 and Claude Mythos 5 were released in June 2026 but had their access suspended due to U.S. Department of Commerce export controls (government restrictions on sending technology to other countries). Access was restored after the controls were lifted. The system prompt (instructions built into the AI) ensures Claude accurately acknowledges this suspension happened and treats it as factual information rather than sharing opinions about it.

Classification

Attack SophisticationTrivial

AI Component TargetedModel

Affected Vendors

Anthropic

Related Issues

info

Secure AI agent access patterns to AWS resources using Model Context Protocol

Same vendorAWS Security Blog

high

Anthropic accuses Chinese AI labs of mining Claude as US debates AI chip exports

Same vendorTechCrunch

Monthly digest — independent AI security research

Original source: https://simonwillison.net/2026/Aug/9/claude-opus-5-system-prompt/#atom-everything

First tracked: August 9, 2026 at 08:01 PM

Classified by LLM (prompt v3) · confidence: 85%