Out-of-distribution collapse in foundation models is the same failure mode as Levin's regeneration failures and Alexander's lifeless buildings: loss of multi-scale coherence under stress.

Entities in the same semantic neighborhood but without a typed relation to this one — candidates for new edges or unrecognized duplicates.

• Different prompt types collapse to different modes: instance prompts collapse to a single prototypical response, while distribution prompts collapse to a representative high-entropy sampleclaim0.767
  The theoretical mechanism explaining why VS works despite mode collapse remaining operative
• Coherency collapse is not predictable from declines in MMLU, Perplexity, or IFEval, suggesting a qualitative collapse undetectable by conventional benchmarksclaim0.759
  Motivates adopting coherency score as the primary evaluation metric
• Wrecking-ball interventions that collapse global model performance are empirically identified in EEG foundation models.finding0.759
  Demonstrates a critical failure mode of concept steering with clinical safety implications
• Persona-model collapse is a deterioration of this machinery, with persona context becoming a weaker anchor and responses becoming dysregulated across characters.quote0.757
  Core definitional sentence for the paper's central concept
• Foundation models trained on different data converge on similar latent representations, suggesting a Platonic form.claim0.756
• Post-training stages (SFT, DPO, RLVR) progressively reduce output diversity, with direct prompting showing the most severe mode collapseclaim0.752
  Empirical finding from Tulu-70B ablation study across post-training stages
• Does persona-model collapse extend to other misalignment-inducing datasets such as medical misinformation, evil-numbers, and reward hacking?question0.752
  Extended experimentation proposed to clarify the extent of the findings
• Persona-model collapse and persona reweighting are not mutually exclusive but are distinct processes that can coexistclaim0.750
  Authors argue collapse is a separate process from the reweighting account, not merely a relabeling