CAM\~OES: A Comprehensive Automatic Speech Recognition Benchmark for European Portuguese

Carlos Carvalho; Francisco Teixeira; Catarina Botelho; Anna Pompili; Rubén Solera-Ureña; Sérgio Paulo; Mariana Julião; Thomas Rolland; John Mendonça; Diogo Pereira; Isabel Trancoso; Alberto Abad

arXiv · 2508.19721

CAM\~OES: A Comprehensive Automatic Speech Recognition Benchmark for European Portuguese

Carlos Carvalho·Francisco Teixeira·Catarina Botelho·Anna Pompili·Rubén Solera-Ureña·Sérgio Paulo·Mariana Julião·Thomas Rolland·John Mendonça·Diogo Pereira·Isabel Trancoso·Alberto Abad

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Abstract

Existing resources for Automatic Speech Recognition in Portuguese are mostly focused on Brazilian Portuguese, leaving European Portuguese (EP) and other varieties under-explored. To bridge this gap, we introduce CAM\~OES, the first open framework for EP and other Portuguese varieties. It consists of (1) a comprehensive evaluation benchmark, including 46h of EP test data spanning multiple domains; and (2) a collection of state-of-the-art models. For the latter, we consider multiple foundation models, evaluating their zero-shot and fine-tuned performances, as well as E-Branchformer models trained from scratch. A curated set of 425h of EP was used for both fine-tuning and training. Our results show comparable performance for EP between fine-tuned foundation models and the E-Branchformer. Furthermore, the best-performing models achieve relative improvements above 35% WER, compared to the strongest zero-shot foundation model, establishing a new state-of-the-art for EP and other varieties.

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Carlos Carvalho, Francisco Teixeira, Catarina Botelho, Anna Pompili, Rubén Solera-Ureña, Sérgio Paulo, Mariana Julião, Thomas Rolland, John Mendonça, Diogo Pereira, Isabel Trancoso, Alberto Abad. 2025-08-27. CAM\~OES: A Comprehensive Automatic Speech Recognition Benchmark for European Portuguese. https://arxiv.org/abs/2508.19721

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