Text To Speech Release Notes
Last updated: Jan 21, 2026
- Jan 21, 2026
- Date parsed from source:Jan 21, 2026
- First seen by Releasebot:Jan 21, 2026
- Modified by Releasebot:Mar 31, 2026
January 21, 2026
Text To Speech launches Inworld TTS 1.5, adding new realtime models with faster first-audio latency, more expressive and stable output, and support for Hindi, Arabic, and Hebrew across 15 total languages.
Inworld TTS 1.5
Launched Inworld TTS 1.5, our newest generation of realtime TTS models featuring:
- Two New Models: Our flagship model inworld-tts-1.5-max is ideal for most use cases, with the best balance of quality and speed. For use cases where latency is the top priority, we also offer inworld-tts-1.5-mini.
- Latency Improvements: Our new TTS-1.5 models achieve P90 latency for first audio chunk delivery under 250ms for our Max model and under 130ms for our Mini model, a 4x improvement compared to TTS-1.
- More Expressive and More Stable: TTS-1.5 is 30% more expressive than prior generations and demonstrates a 40% reduction in word error rates.
- Additional Languages: We’ve added support for additional languages, including Hindi, Arabic, and Hebrew, bringing total languages supported to 15.
- Aug 22, 2025
- Date parsed from source:Aug 22, 2025
- First seen by Releasebot:Dec 23, 2025
- Modified by Releasebot:Mar 31, 2026
August 22, 2025
Text To Speech upgrades Inworld TTS with clearer speech, better voice similarity, stronger non-English output, and inline IPA.
Updates to Inworld TTS
Released an upgraded version of the Inworld TTS models with higher overall quality.
- Speech Quality: Clearer, more natural speech with smoother pacing and more accurate pronunciation.
- Voice Similarity: Cloned voices sound closer to the originals, preserving each voice’s unique style.
- Non-English Languages: More consistent, reliable output across supported non-English languages.
- Custom Pronunciation: New support for inline IPA, giving you control over exact word pronunciations. See the Key Features for details.
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