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Modern video foundation models synthesize photorealistic visual dynamics, yet struggle on long-horizon procedural tasks requiring sequential causal execution—such as equipment maintenance, cooking, or laboratory experiments. Current architectures rely on open-loop generation that cannot adapt to intermediate video outputs, resulting in disordered task sequences, hallucinated progress, and premature task termination. Researchers from MBZUAI and the Australian National University introduce WorldGuide (arXiv:2610.12459, repository: github.com/mbzuai-oryx/WorldGuide, site: mbzuai-oryx.github.io/WorldGuide/), formalizing procedural video generation as closed-loop task execution in visual world space. Given solely an initial image and a high-level task goal, WorldGuide iteratively predicts the next atomic action, generates the corresponding visual video clip, and inspects the synthesized state to dynamically route subsequent actions or determine task completion. A hierarchical visual memory maintains state history under bounded token footprints. To bridge supervision gaps, the authors release WorldGuide-Bench comprising approximately 59K step-annotated videos across 245 tasks and 27 procedural categories. WorldGuide achieves 33.33% Task Success on WorldGuide-Bench, outscoring the strong MiniMax-H3 model (29.90%) even when MiniMax-H3 is provided with reference plans, and surges to 47.69% on VideoCraft-Bench compared to 32.73% for MiniMax-H3 under goal-only conditioning.

Diffusion Transformers (DiTs) underpin frontier video generation systems and high-fidelity 3D modeling, yet self-attention computation over extreme sequence lengths introduces prohibitive inference latencies and memory bottlenecks. While sparse attention represents a promising acceleration pathway, existing methods suffer substantial visual quality degradation and texture corruption under high sparsity regimes. Researchers from The Chinese University of Hong Kong (CUHK) and ByteDance analyze sparse attention failures in DiTs (arXiv:2610.06801), tracing quality drops to three root causes: rigid token grouping constraints, inaccurate interaction selection, and uncompensated attention residuals from discarded tokens. The authors introduce Meta-Cached Sparse Attention (MC-Sparse, project site: dodododddo.github.io/mcsparse-project-page/), a training-free framework that preserves individual Key-Value (KV) selection precision while organizing similar Queries into tile-aligned blocks for hardware efficiency on GPUs. MC-Sparse caches query clusters, exact KV indices, and dense-sparse attention output residuals, reusing this metadata across downstream denoising timesteps. On Minimax-H3-Base video models, MC-Sparse delivers a 1.80x denoising speedup, and a 2.32x acceleration on 3D generative backbones, maintaining near-identical fidelity to dense attention with zero visible quality degradation.