Gradium AI Releases New Default TTS Model: 81.0% Hard-Case Pass Rate at 216 ms Time-to-First-Audio

Gradium AI has launched a new default text-to-speech model achieving an 81.0% human-rated pass rate on a challenging multilingual test set, outperforming competitors. The model also delivers a median time to first audio of 216 ms, improving responsiveness by 170 ms over its predecessor. This update was deployed across Gradium's API and Studio on August 31, 2026, with existing voices unaffected.