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Intrinsic Stability Limits of Autoregressive Reasoning: Structural Consequences for Long-Horizon Execution
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Intrinsic Stability Limits of Autoregressive Reasoning: Structural Consequences for Long-Horizon Execution

#LLM #Autoregressive Reasoning #arXiv #Long-horizon tasks #AI stability #Deep Learning #Structural Breakdown

📌 Key Takeaways

  • LLMs face a systematic breakdown in performance during long-duration or 'long-horizon' reasoning tasks.
  • The research suggests that reasoning failure is an intrinsic structural issue rather than just a result of task complexity.
  • Performance deterioration occurs even in linear, non-branching tasks, challenging existing theories of AI failure.
  • Current autoregressive architectures may have mathematical stability limits that prevent reliable long-form execution.

📖 Full Retelling

Researchers specializing in artificial intelligence published a technical paper on the arXiv preprint server on February 11, 2025, revealing that Large Language Models (LLMs) face intrinsic stability limits that cause performance to collapse during long-horizon reasoning tasks. The study, titled 'Intrinsic Stability Limits of Autoregressive Reasoning,' investigates why AI systems demonstrate a systematic breakdown as the length of a task increases, suggesting that the current autoregressive architecture possesses structural flaws that hinder prolonged execution. By identifying these limitations, the authors aim to shift the academic understanding of AI failure away from simple task complexity and toward the fundamental mathematical nature of how these models generate sequences. Historically, the AI community has attributed the degradation of LLM performance in complex scenarios to 'combinatorial search explosion' or the difficulty of assigning credit across long-term dependencies. However, this new research argues that these conventional explanations are incomplete. The authors demonstrate that even in simplified, linear tasks that lack branching paths or complex logic, LLMs eventually encounter a 'stability limit' where their reasoning capabilities sharply decline. This suggests that the error is not necessarily in the logic of the problem itself, but in the structural consequences of the autoregressive process used to produce tokens. The implications of this study are significant for the development of future autonomous agents and AI-driven problem solvers. If reasoning stability is an inherent structural limitation, then scaling up models or providing more training data may not be sufficient to solve the 'long-horizon' problem. Instead, the research points toward a need for a fundamental redesign of how AI architectures handle sequential execution to ensure they remain stable over extended periods of operation. This foundational shift could redefine how developers approach the next generation of generative AI and reasoning engines.

🏷️ Themes

Artificial Intelligence, Computer Science, Machine Learning

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📄 Original Source Content
arXiv:2602.06413v1 Announce Type: new Abstract: Large language models (LLMs) demonstrate remarkable reasoning capabilities, yet their performance often deteriorates sharply in long-horizon tasks, exhibiting systematic breakdown beyond certain scales. Conventional explanations primarily attribute this phenomenon to task complexity, such as combinatorial search explosion or long-term credit assignment challenges. In this work, we argue that these explanations are incomplete: even in linear, unbra

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