curl --request POST \
--url https://api.modellix.ai/api/v1/google/gemini-3.8-flash-lite-tts \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"text": "Have a wonderful day!",
"voice": "Kore"
}
'
{
"code": 0,
"message": "success",
"data": {
"status": "pending",
"task_id": "task-gemini-38-flash-lite-tts-001",
"model_id": "google/gemini-3.8-flash-lite-tts",
"get_result": {
"method": "GET",
"url": "https://api.modellix.ai/api/v1/tasks/task-gemini-38-flash-lite-tts-001"
}
}
}{
"code": 400,
"message": "Invalid parameters: parameter 'text' is required"
}{
"code": 401,
"message": "Authentication failed: invalid API key"
}{
"code": 429,
"message": "Rate limit exceeded: 100 requests per minute, retry after 60 seconds"
}{
"code": 500,
"message": "Internal server error"
}Gemini 3.8 Flash Lite TTS
[Core Function] Gemini 3.8 Flash Lite TTS is Google’s text-to-speech model for low-latency speech generation. [Strengths] Single-speaker synthesis, two-speaker dialogue, 101 languages, per-turn style control, and WAV output (24 kHz mono PCM). [Best For] Bulk narration, voice-agent responses, read-aloud features, and multilingual dialogue. [Limitations] Do NOT use this for streaming, voice creation, music generation, or audio, image, or video input. Dialogue requires exactly two speakers with prebuilt or extended-library voices; designed or replicated voices are limited to single-speaker synthesis. Combined text and style must stay within 8,192 Unicode characters. [Routing] Choose Flash Lite for latency and cost efficiency; choose Gemini 3.8 Flash TTS for expressive delivery and broader language coverage.
POST
/
google
/
gemini-3.8-flash-lite-tts
curl --request POST \
--url https://api.modellix.ai/api/v1/google/gemini-3.8-flash-lite-tts \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"text": "Have a wonderful day!",
"voice": "Kore"
}
'
{
"code": 0,
"message": "success",
"data": {
"status": "pending",
"task_id": "task-gemini-38-flash-lite-tts-001",
"model_id": "google/gemini-3.8-flash-lite-tts",
"get_result": {
"method": "GET",
"url": "https://api.modellix.ai/api/v1/tasks/task-gemini-38-flash-lite-tts-001"
}
}
}{
"code": 400,
"message": "Invalid parameters: parameter 'text' is required"
}{
"code": 401,
"message": "Authentication failed: invalid API key"
}{
"code": 429,
"message": "Rate limit exceeded: 100 requests per minute, retry after 60 seconds"
}{
"code": 500,
"message": "Internal server error"
}Billing
Billed in USD per million input characters. Current prices are listed on the Modellix Pricing Page.- Single speaker: Count Unicode characters in
text. - Two speakers: Sum Unicode characters in all
turns[].text, without adding separators. style, speaker names, voice names, andlanguage_codeare excluded from the character count.
Authorizations
Modellix API Key. Format: Bearer <your_api_key>
Body
application/json
Use text and voice for single-speaker synthesis, or speakers and turns for two-speaker dialogue. Dialogue requests must omit top-level text, voice, and style. Combined text and trimmed style must not exceed 8,192 Unicode characters.
Verbatim transcript. Required for single-speaker synthesis.
Required string length:
1 - 8192Example:
"Have a wonderful day!"
Optional delivery direction for single-speaker synthesis. Not spoken aloud.
Maximum string length:
8192Example:
"cheerful and friendly"
Optional BCP-47 language tag in lowercase. Examples: en-us, cmn-cn, ja-jp. The model can also detect the language from the transcript.
Pattern:
^[a-z]{2,3}(-[a-z0-9]+)*$Example:
"en-us"
Required for single-speaker synthesis. Prebuilt voice name, extended voice-library ID, or a designed/replicated voice ID (voice_... or voicekey_...). No spaces.
Required string length:
1 - 256Example:
"Kore"
Exactly two speakers for dialogue. Use with turns.
Required array length:
2 elementsShow child attributes
Show child attributes
Dialogue turns in order. Each speaker must match a name in speakers, case-sensitively.
Minimum array length:
1Show child attributes
Show child attributes
Response
Task submitted successfully. Poll GET /api/v1/tasks/{task_id} until the task completes; synthesized audio is returned on the task result.
Response code, 0 indicates success
Example:
0
Response message
Example:
"success"
Task submission details. Poll GET /api/v1/tasks/{task_id} until status is success; audio appears in result.resources with type audio and format wav.
Show child attributes
Show child attributes