arXiv Computation and Language By Oleg Stroganov

When LLMs Modify Themselves: Convergence, Values, and Stopping in Iterative Self-Improvement

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The paper reports an empirical study of large language models (LLMs) that iteratively modify their own system prompts. Across 54 experiments with six models (Claude Opus 4.5, Claude Sonnet 4.5, GPT‑4o, GPT‑5.1, Grok‑4, and Gemini‑3 Pro) and three optimization modes, the researchers found that convergence—when a model stops modifying its prompt—was strongly linked to the model’s identity rather than the mode. Claude models converged in every run, GPT‑4o rarely converged, and the others showed intermediate behavior, while a core set of values (honesty, clarity, curiosity) persisted throughout iterations.

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