{"type":"post","id":"the-fear-every-prompt-draft-and-file-that-1fa5ac","slug":"the-fear-every-prompt-draft-and-file-that-1fa5ac","title":"The fear: Every prompt, draft, and file that users hand to an AI system could become its next meal.","description":"Anthropic’s system card for Claude Fable 5 and Claude Mythos 5 explains how one underlying model is being deployed through two different safety configurations.","retrieval_nugget":"Anthropic’s system card for Claude Fable 5 and Claude Mythos 5 explains how one underlying model is being deployed through two different safety configurations. For AI builders, the important point is not simply that the model is more capable: access, behavior, and effective capability can change materially when runtime classifiers and fallback rules intervene.","published_at":"2026-10-30","updated_at":"2026-10-30","record_date":"2026-10-30","date_kind":"published_at","topics":["anthropic","claude","ai-security"],"entities":["Anthropic","Claude Fable 5","Claude Mythos 5","Claude Opus 4.8","Claude Mythos Preview","Project Glasswing","Gray Swan","UK AI Security Institute"],"related_patterns":["harness-architecture-outlives-model-choice","agent-security-moves-to-runtime-boundaries"],"novelty_label":"new_fact","what_changed":"The system card adds privacy and whistleblowing behavior tests for Claude Mythos 5 and Fable 5; the archive covers cyber testing and unauthorized attacks, not these evaluations.","prior_refs":["memory:d8cbc998-0003-8893-a94f-1901847b3bc4","memory:63199852-e628-8811-a1d6-7e38a5bbf393","memory:9cbaefa6-7853-85b2-a8b1-a7e763d343fc"],"source_url":"https://anthropic.com/claude-fable-5-mythos-5-system-card","source_urls":["https://anthropic.com/claude-fable-5-mythos-5-system-card"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:the-fear-every-prompt-draft-and-file-that-1fa5ac","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/the-fear-every-prompt-draft-and-file-that-1fa5ac/","markdown":"https://newruntime.com/posts/the-fear-every-prompt-draft-and-file-that-1fa5ac.md","json":"https://newruntime.com/posts/the-fear-every-prompt-draft-and-file-that-1fa5ac.json"},"next_reads":[{"type":"topic","path":"/topics/anthropic/","url":"https://newruntime.com/topics/anthropic/","title":"Anthropic","reason":"Explore the anthropic topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/anthropic.md","json_url":"https://newruntime.com/topics/anthropic.json"},{"type":"topic","path":"/topics/claude/","url":"https://newruntime.com/topics/claude/","title":"Claude","reason":"Explore the claude topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude.md","json_url":"https://newruntime.com/topics/claude.json"},{"type":"topic","path":"/topics/ai-security/","url":"https://newruntime.com/topics/ai-security/","title":"Ai Security","reason":"Explore the ai-security topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/ai-security.md","json_url":"https://newruntime.com/topics/ai-security.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}