Author

Wei-Ning Zhang

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Preprint Aug 2026

UpgradeBench: A Decision-Centric Benchmark for Upgrading Fine-Tuned LLM Specialists

This work presents UpgradeBench, a decision-driven longitudinal benchmark covering four consecutive Qwen releases, one continuation checkpoint, six tasks, and two model sizes, augmented by OLMo checkpoints with known training lineage, and disentangles three core questions: whether a new checkpoint improves fixed-recipe retrained specialist performance, whether specialization assets transfer across versions, and what recovery resources are usable.

Yefei Chen, Wei-Ning Zhang · 0 citations

Review Aug 2026

No Judgment Without a Reason: Counterfactual Receipts for Versioned AI Evaluators

This work formalizes evaluator reasoning accountability via three core sources: grounds, norms, and authority, and defines judgment receipts as minimal source replacement sets that reproduce revised verdicts to explain judgment transitions.

Yefei Chen, Wei-Ning Zhang · 0 citations