Gradium AI Releases New Default TTS Model: 81.0% Hard-Case Pass Rate at 216 ms Time-to-First-Audio
MarkTechPost Michal Sutter
Gradium AI released a new default text-to-speech model across its API and Studio. It reported an 81.0% human-rated pass rate on a 500-sentence hard-case set and a 216 ms P50 time-to-first-audio. The default model switch went live on August 31, 2026 with no migration and existing (including custom) voices continuing to work unchanged.
Why it matters
Speed and accuracy usually pull against each other in text-to-speech. Gradium AI's new default model reports both: an 81.0% human-rated pass rate on 500 hard sentences across five languages, at 216 ms P50 time-to-first-audio on Coval. The evaluation set is open on Hugging Face under CC BY 4.0. The post Gradium AI Releases New Default TTS Model: 81.0% Hard-Case Pass Rate at 216 ms Time-to-First-Audio appeared first on MarkTechPost.