Model comparison
Compare Gemini 3.1 Flash Live Preview and Inworld Realtime TTS-2 using the same provider-sourced voice & realtime rubric. No mystery score and no invented benchmark ranking.
Quick take
Google's preview audio-to-audio model for low-latency dialogue with multimodal awareness, thinking, search grounding, and function calling.
The model is preview, and paid versus unpaid projects have different data-use terms. Confirm both before capturing sensitive conversations.
Inworld's newest expressive realtime text-to-speech model, designed to remember conversational delivery and speak in more than 100 languages.
This is the speech layer, not a complete agent. Inworld's current zero-data-retention page does not explicitly list TTS-2, so confirm coverage before sending sensitive text or voice data.
Compare the published facts
Values use each provider's own published units and limits. A blank means the provider did not publish a directly comparable value in the sources reviewed.
| Voice & realtime | Gemini 3.1 Flash Live Preview | Inworld Realtime TTS-2 |
|---|---|---|
| Price basisToken-, character-, or minute-based price for the listed access route. | Audio $0.005/min in · $0.018/min out | $25 / 1M chars on demand; volume discounts |
| Interaction modeSpeech-to-speech, audio-to-audio, or streamed text-to-speech behavior. | Realtime audio-to-audio, multimodal input | Steerable realtime TTS with prior-audio context |
| Published latencyProvider-published measurement with its stated exclusions; not a Cody test. | Not published | Under 200ms median TTFA |
| LanguagesProvider-documented language coverage or a clear unpublished marker. | Multilingual; verify current Live API support | 100+ with mid-utterance switching |
| Tools & controlNative function calling, reasoning, or speech-control features. | Function calling and search grounding | Voice direction, design, cloning, non-verbals |
| Context or input limitDocumented token or character limit where it is meaningful. | 131,072 input · 65,536 output | Not published |
How to choose
Start with the job you need to complete, then validate cost, access, and policy details on your exact provider route.
Google says paid Gemini API content is not used to improve its products; unpaid service data generally can be. Confirm billing status and current terms before sending sensitive conversations.
Provider and API links
Inworld advertises zero data retention as an enterprise add-on, but its currently published ZDR support page names only TTS-1.5 Mini and Max. Confirm TTS-2 coverage directly before sending regulated or confidential text.
Frequently asked questions
Gemini 3.1 Flash Live Preview: Google's preview audio-to-audio model for low-latency dialogue with multimodal awareness, thinking, search grounding, and function calling. Inworld Realtime TTS-2: Inworld's newest expressive realtime text-to-speech model, designed to remember conversational delivery and speak in more than 100 languages.
Consider Gemini 3.1 Flash Live Preview when your priority is Multimodal voice assistants. Consider Inworld Realtime TTS-2 when your priority is Realtime companions and support voices. Test both with your own data and provider route before committing.
No. This comparison aligns provider-published facts for the Voice & realtime category. It does not claim a universal winner or combine incompatible third-party benchmark scores.
