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Sponsored Design Multi-Agent AI Systems Using MCP and A2A: Engineer your own Pyt Design Multi-Agent AI Systems Using MCP and A2A: Engineer your own Pyt

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Jiang-li Sheng

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Preprint Aug 2026

No Universal Signal Predicts Sample-Level LLM Regression under Version Updates

It is found that signal effectiveness is task-dependent: confidence is strongest on MCQ and simpler math, while likelihood/KL signals give the most frequent gains on harder math and code; no signal is universally best across model updates either, and some cross-version signals stay informative even when confidence fails, including without labels.

Jiang-li Sheng, Yiwei Lu · 0 citations

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