State World Models: Execute the Rules, Generate the Pixels

One-line takeaway

Tsinghua's Stateful Harness separates world evolution from rendering: it maintains a rule-governed world state, renders events with a frozen video model, and updates state from each clip, so world models obey persistent, invisible rules.

清华的 Stateful Harness 把世界演化和视频渲染分开：按规则维护世界状态，用冻结的视频模型渲染每个事件，再以生成片段更新状态，让交互式世界模型遵守看不见的持久规则。