Model comparison
Compare Gemini 3.8 Flash TTS and Gemini 3.8 Flash-Lite TTS using the same provider-sourced voice & realtime rubric. No mystery score and no invented benchmark ranking.
Quick take
Google's speech-generation model for expressive narration, character voices and dialogue in 130 languages.
Put delivery instructions in speech_metadata, not the spoken script. Voice replication requires the speaker's consent; regional restrictions apply. Generated audio carries SynthID watermarking.
Google's lower-cost speech-generation model for read-aloud features and high-volume audio in 101 languages.
Put delivery instructions in speech_metadata, not the spoken script. Voice replication requires the speaker's consent; regional restrictions apply. Generated audio carries SynthID watermarking.
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 3.8 Flash TTS | Gemini 3.8 Flash-Lite TTS |
|---|---|---|
| Price basisToken-, character-, or minute-based price for the listed access route. | $0.50 text input · $9 audio output / 1M tokens | $0.50 text input · $6 audio output / 1M tokens |
| Interaction modeSpeech-to-speech, audio-to-audio, or streamed text-to-speech behavior. | Text-to-speech with two-speaker dialogue | Text-to-speech with two-speaker dialogue |
| Published latencyProvider-published measurement with its stated exclusions; not a Cody test. | Not published | Not published |
| LanguagesProvider-documented language coverage or a clear unpublished marker. | 130 languages | 101 languages |
| Tools & controlNative function calling, reasoning, or speech-control features. | Voice design and replication; no function calling | Voice design and replication; no function calling |
| Context or input limitDocumented token or character limit where it is meaningful. | 8,192 input · 16,384 output tokens | 8,192 input · 16,384 output tokens |
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 prompts and responses are not used to improve its products. Unpaid-service content generally may be used, with different treatment for EEA, UK, and Swiss users; check the current terms for your account and region.
Provider and API links
Google says paid Gemini API prompts and responses are not used to improve its products. Unpaid-service content generally may be used, with different treatment for EEA, UK, and Swiss users; check the current terms for your account and region.
Provider and API links
Frequently asked questions
Gemini 3.8 Flash TTS: Google's speech-generation model for expressive narration, character voices and dialogue in 130 languages. Gemini 3.8 Flash-Lite TTS: Google's lower-cost speech-generation model for read-aloud features and high-volume audio in 101 languages.
Consider Gemini 3.8 Flash TTS when your priority is Audiobooks. Consider Gemini 3.8 Flash-Lite TTS when your priority is Read-aloud features. 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.
