Convergence Without Understanding: When Language Models Agree on Representations but Disagree on Reasoning
New research challenges a foundational assumption about LLM convergence. While models across different scales and training regimes develop similar internal representations, they reason differently on identical problems, especially on tasks they collectively struggle with. This dissociation matters because it suggests that architectural diversity may mask deeper fragmentation in how models solve problems, complicating efforts to build unified interpretability frameworks and raising questions about whether representational alignment translates to behavioral reliability.
Modelwire context
ExplainerThe paper's sharpest finding is not that models differ, but that they differ most on problems they all find hard, which is precisely where practitioners most need consistency. Representational convergence, measured here via Centered Kernel Alignment, turns out to be a poor proxy for whether models will agree when it counts.
This connects directly to the 'Metacognition as Reward' paper covered the same week, which tries to improve reasoning quality by treating the model's own process as a reward signal. That work assumes reasoning can be guided toward coherence; the convergence paper complicates that assumption by showing reasoning divergence may be structural rather than a training artifact. It also echoes the temporal failure modes piece on statutory QA, where GPT, Claude, and DeepSeek produced divergent outputs on identical legal questions despite presumably similar training regimes. Both stories point to the same underlying problem: surface-level capability alignment does not guarantee behavioral reliability in deployment.
Watch whether interpretability teams at major labs begin publishing CKA-style audits alongside behavioral benchmarks. If representational similarity scores start appearing in model evaluation cards within the next two release cycles, it signals the field has accepted this dissociation as a real measurement problem rather than a theoretical curiosity.
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MentionsPlatonic Representation Hypothesis · Centered Kernel Alignment
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