Benchmarks
Blog post from Coval
The text discusses the intricacies of evaluating text-to-speech (TTS) systems, emphasizing the significance of Time to First Audio (TTFA) and Word Error Rate (WER) as critical benchmarks for assessing performance. Coval, an independent evaluation platform founded by Brooke Hopkins, applies rigorous testing methodologies to provide standardized TTS benchmarks, enabling fair comparisons across providers. As of May 2026, Gradium leads these benchmarks, demonstrating superior latency and competitive WER, attributed to its innovative audio language models that integrate multiple voice tasks in a single architecture. The platform's open-source benchmarking tools allow developers to conduct their evaluations, offering a more realistic assessment of TTS performance in production environments compared to vendor-reported metrics.
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