Auto57%Harbor: pendingMultimodalKnowledge & Reasoning

ChemExplain

ChemExplain: A Multimodal Benchmark for Explanatory Chemical Reasoning

A multimodal benchmark of 1,180 multiple-choice questions evaluating explanatory attribution in chemistry by linking molecular images to observed effects.

How to run

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

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

11 sourced entries
HarnessSourceConfidenceLink
GPT-5.478.6N/AIndependentmediumOct 12, 2026arxiv.org
Claude Sonnet 4.678.2N/AIndependentmediumOct 12, 2026arxiv.org
Gemini 3.1 Pro78.0N/AIndependentmediumOct 12, 2026arxiv.org
GPT-577.4N/AIndependentmediumOct 12, 2026arxiv.org
GPT-4o68.1N/AIndependentmediumOct 12, 2026arxiv.org
Qwen3-VL58.8N/AIndependentmediumOct 12, 2026arxiv.org
Phi-4-reasoning-vision51.3N/AIndependentmediumOct 12, 2026arxiv.org
InternVL3.548.0N/AIndependentmediumOct 12, 2026arxiv.org
Qwen2.5-VL Instruct42.6N/AIndependentmediumOct 12, 2026arxiv.org
ChemVLM34.0N/AIndependentmediumOct 12, 2026arxiv.org
Janus-Pro23.2N/AIndependentmediumOct 12, 2026arxiv.org

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

Reproduced by the community

All runs
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About

ChemExplain comprises 1,180 multiple-choice questions derived from 383 peer-reviewed papers. Each item pairs a molecular or reaction image with an observed effect and four candidate explanations tied to visible structural features.

Constructed via a multi-agent framework with expert validation, it measures explanatory attribution. The strongest model achieved 78.6% accuracy, with attribution failures accounting for the majority of errors.