{"data":{"id":"81aaa891-bef0-4ced-9132-b6ed9b7f0df5","title":"Quoting Claude Opus 5 system prompt","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.","solution":"N/A -- no mitigation discussed in source.","labels":["safety"],"sourceUrl":"https://simonwillison.net/2026/Aug/9/claude-opus-5-system-prompt/#atom-everything","publishedAt":"2026-08-09T23:31:39.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Claude Opus 5","Claude Fable 5","Claude Mythos 5"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"patchAvailable":null,"disclosureDate":"2026-08-09T23:31:39.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"trivial","impactType":null,"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.85,"researchCategory":null,"atlasIds":null}}