Beyond Final Answers: CRYSTAL Benchmark for Transparent Multimodal Reasoning Evaluation
We introduce CRYSTAL (Clear Reasoning via Yielded Steps, Traceability, and Logic), a diagnostic benchmark with 6,372 instances that evaluates multimodal reasoning through verifiable intermediate steps. We propose two complementary metrics: Match F1, which scores step-level precision and recall via semantic similarity matching, and Ordered Match F1, which further penalizes disordered reasoning chains. References are constructed through a Delphi-inspired pipeline in which four independent MLLMs generate trajectories, which are then aggregated via semantic clustering and validated through human quality gates. Evaluation of 20 MLLMs, including commercial frontier systems not used during bench...
| Authors | Wayner Barrios, SouYoung Jin |
|---|---|
| Primary category | cs.AI |
| Published | 13 March 2026 |
| Last updated at source | 18 September 2026 |
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