What does "expressiveness" in voice AI actually mean? A deep dive with Inworld's TTS-2

SIGKITTEN · x · 2026-09-03

"Expressiveness" is voice AI's current buzzword—this video unpacks what it actually means, using material from Inworld's new TTS-2 model. It covers the Blizzard Challenge history, naturalness vs expressiveness, human evals and speech arenas, AI-as-judge, deterministic proxies, Goodhart's law, text markers and alignment post-training for expressive models, and why expressiveness isn't always the goal.

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