LAMAR-Bench: Evaluating Long-Form and Multi-Audio Understanding and Reasoning

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Audio-language models increasingly process long recordings and multiple audio inputs, requiring fine-grained acoustic understanding, cross-audio reasoning, and decisions under goals and constraints. Existing benchmarks cover these requirements unevenly, while answer accuracy can obscure failures in evidence localization and decision reliability. We introduce LAMAR-Bench, a diagnostic benchmark with 1,597 questions across three capability families: fine-grained understanding, cross-audio relation reasoning, and decisions under goals and constraints. A shared-fact pipeline derives tasks with traceable supervision from podcast recordings. Across the dataset, input counts range from 1 to 19 audio clips per question, with total input duration reaching 59.9 minutes. The evaluation combines task-level metrics, textual reference baselines, and paired diagnostics of answer format, presentation order, and requested goals. Experiments with 14 audio-language and omni-modal systems reveal persistent limitations: the highest paralinguistic-analysis and acoustic-localization accuracies are only 51.09% and 54.38%, respectively, while audio difference analysis remains challenging. A matched answer-format diagnostic reveals substantial gaps between answer recognition and direct evidence localization. Among four hosted systems evaluated on paired goals, the best both-goal accuracy is 63.64%, indicating that correct selections do not consistently extend across different requirements for the same candidates. These findings highlight the need for more precise evidence grounding and reliable goal-conditioned audio reasoning.