Audience
Voice AI developers building realtime agents, characters, tutors, support systems, and companions that need emotionally aware, multilingual, humanlike speech
About Realtime TTS-2
Realtime TTS-2 from Inworld AI is a new generation of voice model built for real-time conversation: a voice model that feels as human as it sounds. It hears the full audio of an exchange, picks up the user’s tone, pacing, and emotional state, then takes voice direction in plain English, the way developers prompt an LLM. Instead of generating speech in isolation, it listens to prior turns of the exchange, so tone and pacing carry forward, and the same line can land differently after a joke than after bad news. Voice Direction lets developers steer delivery like a director would steer a voice actor, using natural-language descriptions rather than fixed emotion presets or sliders. Inline nonverbals like [sigh], [breathe], and [laugh] can be placed inside the text, and the model renders them as audio events. Realtime TTS-2 preserves one voice identity across more than 100 languages, including mid-utterance language switches.
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Eleven v4
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Gemini 3.8 Flash TTS
Gemini 3.8 Flash TTS is Google’s expressive text-to-speech model for creating custom voices, directed performances, and multilingual audio experiences. The model can generate original voices from natural-language prompts by specifying characteristics such as role, accent, tone, pacing, and vocal style across more than 100 languages and dialects. Users can also replicate an authorized voice from a short audio sample, with consent verification, SynthID watermarking, and C2PA credentials supporting responsible voice creation. Gemini 3.8 Flash TTS provides line-by-line performance control, long-form speech generation, two-speaker scene staging, and support for nonverbal cues such as laughs, sighs, gasps, and conversational backchanneling. It is suited to use cases including games, audiobooks, podcasts, dubbing, interactive voice agents, branded audio, and media localization.
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Pricing
Starting Price:
$25 per month
Free Version:
Free Version available.
Company Information
Inworld
Founded: 2021
United States
inworld.ai/blog/realtime-tts-2
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Product Details
Platforms Supported
Cloud
Training
Documentation
Live Online
Support
Online
Realtime TTS-2 Frequently Asked Questions
Q: What kinds of users and organization types does Realtime TTS-2 work with?
Realtime TTS-2 works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does Realtime TTS-2 support in their product?
Realtime TTS-2 supports these languages: English.
Q: What kind of support options does Realtime TTS-2 offer?
Realtime TTS-2 offers support via online.
Q: What other applications or services does Realtime TTS-2 integrate with?
Realtime TTS-2 integrates with: ChatGPT, Claude Duet, Claude for Legal, Claude, Gemini, Grok, and Perplexity.
Q: Does Realtime TTS-2 have an API?
Yes, Realtime TTS-2 has an API.
Q: What type of training does Realtime TTS-2 provide?
Realtime TTS-2 provides training in the form of documentation and live online.
Q: How much does Realtime TTS-2 cost?
Pricing for Realtime TTS-2 starts at $25 per month.
