Research·arXiv cs.LG·2d ago

World models trained for long-horizon accuracy, not local fidelity

A new approach to world model training addresses a critical gap between how these systems learn and how they're deployed. Current methods optimize for single-step prediction accuracy, then recursively apply the model forward, causing small errors to compound catastrophically over long horizons. This paper proposes training world models end-to-end on final-frame prediction instead, aligning the training objective with actual deployment constraints. The shift matters for robotics, planning, and any domain requiring multi-step lookahead, as it forces the model to learn which early decisions have outsized downstream impact rather than treating all transitions equally.

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Explainer

The paper's core contribution isn't just identifying error compounding (known) but showing that the fix requires inverting the training objective entirely: optimize for final-frame accuracy rather than transition accuracy. This forces models to learn causal importance rather than local smoothness.

This connects directly to the Muon optimizer failure mode from earlier today. That work showed how faster convergence can mask representation fragility at the readout interface. This world model paper tackles a related problem from the opposite angle: even if your optimizer is stable, training on the wrong objective (next-frame prediction) creates a hidden brittleness that only surfaces during deployment. Both papers challenge the assumption that optimizing for intermediate metrics (per-step loss, per-parameter movement) translates to robust systems. For robotics and planning tasks, the stakes are higher than language modeling, which explains why this mismatch matters enough to warrant rethinking the entire training pipeline.

If teams applying this to real robotic control tasks report that 4-8 step horizon accuracy improves by 30%+ compared to recursive single-step models on the same architecture, the approach is validated. If the gains vanish beyond 12-16 steps or require significantly larger models to match recursive baselines, the fix is incomplete and the problem runs deeper than training objective misalignment.

Coverage we drew on

Post-Grokking Collapse at the Representation-Readout Interface in Muon-Trained Transformers · arXiv cs.LG

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MentionsDirect Prediction World Model

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Modelwire summarizes, we don’t republish. arXiv cs.LG originally reported this story as “Beyond Myopic World Models: Long-Horizon End-to-End Training for Direct Future Prediction”. The full content lives on arxiv.org. If you’re a publisher and want a different summarization policy for your work, see our takedown page.