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google / gemini-3-8-flash-tts

Commercial use

Google’s flagship creative text-to-speech model for high-fidelity, expressive voice generation. Gemini 3.8 Flash TTS supports natural-language voice design, voice cloning from around 30s of authorized audio, multi-speaker dialogue, and speech generation across 130 languages.

Pricing: $0.50 in · $9.00 out
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google/gemini-3-8-flash-tts USD / 1M tokens

Option / channelInputOutput
Official$0.5$9

Input

2 / 2
Item 1

Must match dialogue turns

Item 2

Must match dialogue turns

5
Item 1

Must exist in Speakers

Free-form delivery for this turn (tone, emotion, pace). Examples: whisper quietly; Warm and neutral delivery with micro-pauses; commanding, rich vocal modulation, dramatic pauses; High energy, elongated vowels; Calm, measured delivery.

Put 3.8 expressions in the line, wrapped in angle brackets. Example: Hello there. <laugh> That works. Tags: <argh>, <breath>, <cackle>, <cheer>, <chuckle>, <chuckles>, <cough>, <cry>, <exhales>, <gasp>, <giggle>, <groan>, <growl>, <grr>, <grunt>, <heavy breath>, <hiss>, <laugh>, <laughter>, <long pause>, <moan>, <pant>, <pff>, <phew>, <scream>, <short pause>, <shout>, <shriek>, <sigh>, <sighs>, <sneeze>, <snicker>, <snort>, <sob>, <throat-clearing>, <tsk>, <whimper>, <whispering>, <whispers>, <yawn>.

Item 2

Must exist in Speakers

Free-form delivery for this turn (tone, emotion, pace). Examples: whisper quietly; Warm and neutral delivery with micro-pauses; commanding, rich vocal modulation, dramatic pauses; High energy, elongated vowels; Calm, measured delivery.

Put 3.8 expressions in the line, wrapped in angle brackets. Example: Hello there. <laugh> That works. Tags: <argh>, <breath>, <cackle>, <cheer>, <chuckle>, <chuckles>, <cough>, <cry>, <exhales>, <gasp>, <giggle>, <groan>, <growl>, <grr>, <grunt>, <heavy breath>, <hiss>, <laugh>, <laughter>, <long pause>, <moan>, <pant>, <pff>, <phew>, <scream>, <short pause>, <shout>, <shriek>, <sigh>, <sighs>, <sneeze>, <snicker>, <snort>, <sob>, <throat-clearing>, <tsk>, <whimper>, <whispering>, <whispers>, <yawn>.

Item 3

Must exist in Speakers

Free-form delivery for this turn (tone, emotion, pace). Examples: whisper quietly; Warm and neutral delivery with micro-pauses; commanding, rich vocal modulation, dramatic pauses; High energy, elongated vowels; Calm, measured delivery.

Put 3.8 expressions in the line, wrapped in angle brackets. Example: Hello there. <laugh> That works. Tags: <argh>, <breath>, <cackle>, <cheer>, <chuckle>, <chuckles>, <cough>, <cry>, <exhales>, <gasp>, <giggle>, <groan>, <growl>, <grr>, <grunt>, <heavy breath>, <hiss>, <laugh>, <laughter>, <long pause>, <moan>, <pant>, <pff>, <phew>, <scream>, <short pause>, <shout>, <shriek>, <sigh>, <sighs>, <sneeze>, <snicker>, <snort>, <sob>, <throat-clearing>, <tsk>, <whimper>, <whispering>, <whispers>, <yawn>.

Item 4

Must exist in Speakers

Free-form delivery for this turn (tone, emotion, pace). Examples: whisper quietly; Warm and neutral delivery with micro-pauses; commanding, rich vocal modulation, dramatic pauses; High energy, elongated vowels; Calm, measured delivery.

Put 3.8 expressions in the line, wrapped in angle brackets. Example: Hello there. <laugh> That works. Tags: <argh>, <breath>, <cackle>, <cheer>, <chuckle>, <chuckles>, <cough>, <cry>, <exhales>, <gasp>, <giggle>, <groan>, <growl>, <grr>, <grunt>, <heavy breath>, <hiss>, <laugh>, <laughter>, <long pause>, <moan>, <pant>, <pff>, <phew>, <scream>, <short pause>, <shout>, <shriek>, <sigh>, <sighs>, <sneeze>, <snicker>, <snort>, <sob>, <throat-clearing>, <tsk>, <whimper>, <whispering>, <whispers>, <yawn>.

Item 5

Must exist in Speakers

Free-form delivery for this turn (tone, emotion, pace). Examples: whisper quietly; Warm and neutral delivery with micro-pauses; commanding, rich vocal modulation, dramatic pauses; High energy, elongated vowels; Calm, measured delivery.

Put 3.8 expressions in the line, wrapped in angle brackets. Example: Hello there. <laugh> That works. Tags: <argh>, <breath>, <cackle>, <cheer>, <chuckle>, <chuckles>, <cough>, <cry>, <exhales>, <gasp>, <giggle>, <groan>, <growl>, <grr>, <grunt>, <heavy breath>, <hiss>, <laugh>, <laughter>, <long pause>, <moan>, <pant>, <pff>, <phew>, <scream>, <short pause>, <shout>, <shriek>, <sigh>, <sighs>, <sneeze>, <snicker>, <snort>, <sob>, <throat-clearing>, <tsk>, <whimper>, <whispering>, <whispers>, <yawn>.

When true, filler words like "hmm" and "ahh," interjections, and natural background sounds will be added to the conversation.

Controls the randomness of the speech output. Higher values produce more creative and varied delivery, while lower values make the output more predictable and focused. Default value: 1

Output

output typeaudioExample output

README

Complete guide to using google/gemini-3-8-flash-tts