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PHRBench

PHRBench: A Behavioral Evaluation of Post-Hallucination Reasoning in LLMs

A controlled benchmark with 4820 instances across 4 domains evaluating how LLMs behaviorally resolve hallucinated premises via compliance, avoidance, or correction.

How to run

ltb · phrbench
$ npm i -g lettokenburn-cli
$ ltb bench info phrbench

External harness. No Harbor adapter has been generated for this benchmark yet. `ltb bench info` prints the known links.

Runs happen on your machine with your own subscription; only the score summary is pushed. CLI docs

Scores

12 sourced entries
HarnessSourceConfidenceLink
GPT-5.2-chat91.0N/AIndependentmediumOct 7, 2026arxiv.org
GPT-4o-mini89.3N/AIndependentmediumOct 7, 2026arxiv.org
Gemini 2.5 Pro87.9N/AIndependentmediumOct 7, 2026arxiv.org
Claude Sonnet 4 (2025-05-14)87.7N/AIndependentmediumOct 7, 2026arxiv.org
Gemini 2.0 Flash Experimental84.6N/AIndependentmediumOct 7, 2026arxiv.org
Qwen2.5-72B-Instruct75.7N/AIndependentmediumOct 7, 2026arxiv.org
GPT-4o72.1N/AIndependentmediumOct 7, 2026arxiv.org
Qwen3-32B70.2N/AIndependentmediumOct 7, 2026arxiv.org
Qwen2.5 32B Instruct67.9N/AIndependentmediumOct 7, 2026arxiv.org
Qwen3 8B66.5N/AIndependentmediumOct 7, 2026arxiv.org
Qwen2.5-7B-Instruct64.5N/AIndependentmediumOct 7, 2026arxiv.org
Qwen2.5-1.5B-Instruct35.7N/AIndependentmediumOct 7, 2026arxiv.org

Every number links to where it was published. Low-confidence rows are muted and need per-cell verification.

Reproduced by the community

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About

PHRBench contains 4820 controlled instances spanning Chemistry, Biomedicine, Physics, and Code Generation. It evaluates 18 LLMs by characterizing reasoning trajectories independently of final-answer correctness.

Scoring classifies behaviors as Hallucination Compliance, Avoidance, or Heuristic Correction. Key findings reveal successful recovery is rare, associated with belief updates, and predictable from prompt features (AUROC 0.847).