Source: https://ailoot.ai/models/en/gemini-3-8-flash-tts/ Canonical: https://ailoot.ai/models/en/gemini-3-8-flash-tts/ Language: en # Gemini 3.8 Flash Tts [Markdown](https://ailoot.ai/models/en/gemini-3-8-flash-tts/index.md) · [JSON](https://ailoot.ai/models/en/gemini-3-8-flash-tts/facts.json) ## [Gemini 3.8 Flash Tts](https://ailoot.ai/models/en/gemini-3-8-flash-tts/) A Google speech model for expressive narration, audiobooks and dialogues with voice control and support for 130 languages. - [**Ailoot · Text to speech** `POST /v1/audio/speech` `gemini-3.8-flash-tts`](https://ailoot.ai/models/en/gemini-3-8-flash-tts/#method-0) About the model This description covers the model’s capabilities. Available in Ailoot inputs, outputs and options are listed for the selected method below. Gemini 3.8 Flash TTS is intended for expressive narration and long-form storytelling. Google highlights audiobooks, multi-speaker dialogues and voice consistency over extended passages. Speech control covers emotional delivery, rhythm and pronunciation, including regional accents and dialects. #### Voices and languages The model is described as supporting **130 languages**, including Russian. **30 preset voices**, an expanded library, creation of a voice identity from a description and reproduction of a voice from a sample are available. These capabilities allow timbre and performance character to be selected for particular material. Dialogue lines are associated with speakers. One multi-speaker request can use no more than two preset voices. For voices created from a description or sample, lines are synthesized separately; having such a voice does not make it another preset voice within a multi-voice request. #### Text and delivery control Input is **text**, and output **audio**. Limits are **8192 input tokens** and **16,384 output tokens**. Text is treated as a spoken line; style description and the selected speaker are specified separately. This separates the words to be spoken from instructions about how to read them. Style covers emotion, pace, volume and prosody. Brief events such as laughter, sighs and pauses are specified with special audio tags within the line. These tags control the performance rather than serving as ordinary words to be read aloud. #### Audio formats and capabilities Ordinary generation returns **WAV** by default. Streaming uses **headerless PCM** by default. Original parameters are **24 kHz, one channel and 16 bits**. PCM, mu-law and A-law are also provided. Context caching and batch processing are supported. The specific file format and available settings depend on the selected speech method. The model specializes in speech creation. Function calling, code execution, file search, search grounding, Google Maps, image generation, structured text responses, Thinking and URL contents are not supported. Consistent voice and controllable expressiveness are the model's stated aims, not a promise of perfect pronunciation in every line. **Ailoot · Text to speech** `POST /v1/audio/speech` `gemini-3.8-flash-tts` [`gemini-3.8-flash-tts`](https://ailoot.ai/models/en/#m=gemini-3.8-flash-tts&route=Core&caller=gemini-3.8-flash-tts&fmt=speech) Google /`gemini-3.8-flash-tts` ### Overview A Google speech model for expressive narration, audiobooks and dialogues with voice control and support for 130 languages. Accepted inputs Text Results Audio ### Available in Ailoot · inputs & methods **Ailoot · Text to speech** `POST /v1/audio/speech` Input types `text` Output types `audio` Context 8,192 tokens Maximum output 16,384 tokens Output format native audio bytes or JSON asset links | Field | Type | Requirement | Values & limits | Default | | --- | --- | --- | --- | --- | | Field`model` | Type`string` | RequirementRequired | Values & limits gemini-3.8-flash-tts | Default— | | Field`input` | Type`string` | RequirementRequired | Values & limits Minimum length: 1 | Default— | | Field`voice` | Type`string` | RequirementOptional | Values & limits Achernar, Achird, Algenib, Algieba, Alnilam, Aoede, Arlo, Autonoe, Bodi, Brio, Callirrhoe, Charon, Cleo, Cruz, Daro, Despina, Elio, Enceladus, Enya, Enzo, Erinome, Fenrir, Finn, Fola, Gacrux, Gero, Hali, Iapetus, Jett, Jori, Kira, Knox, Koda, Kore, Laomedeia, Leda, Lora, Ludo, Lumi, Mako, Milo, Neno, Nika, Nyla, Olin, Orus, Puck, Pulcherrima, Rami, Rasalgethi, Riko, Rina, Sadachbia, Sadaltager, Sami, Schedar, Sola, Sulafat, Tari, Tavi, Tova, Umbriel, Varo, Veda, Vindemiatrix, Zali, Zeno, Zephyr, Zubenelgenubi, Zuri | DefaultKore | | Field`response_format` | Type`string` | RequirementOptional | Values & limits , wav, json | Default | | Field`stream_format` | Type`string` | RequirementOptional | Values & limits audio | Default— | Input material combinations **text\_to\_speech** · Required: input Method parameters and lifecycle | Parameter | Contract | | --- | --- | | Parameter`material_types` | Contracttext | | Parameter`required` | Contractnull | | Parameter`optional_controls` | Contractnull | Lifecycle: `synchronous_result_then_owned_library` `GET /v1/media/tasks/{task_id}` · actual returned task\_id or media library record `GET /v1/media/assets/{asset_id}/content` `GET /v1/media/assets` `GET /v1/media/assets/{asset_id}` Method shapes and IDs are exact; supplier capability is separate from admission. ### Pricing #### Ailoot method rates Input $0.0005 */ 1K* Output $0.009 */ 1K* Cache read $0.000125 */ 1K* Ailoot reserves an estimated amount before a request. After the result, it settles the final charge from measured usage. Streaming settlement uses the final usage record. [How reservation and settlement work →](https://ailoot.ai/docs/en/billing/reserve/) ### Example requests #### Ailoot · Text to speech Speech example ```bash set -eu : "${AILOOT_API_KEY:?Set your Ailoot API key}" : "${AILOOT_TEXT_FILE:?Set your actual UTF-8 narration script}" export AILOOT_TEXT_FILE python3 - <<'PY_REQUEST' import json,os from pathlib import Path p=json.loads('{"model": "gemini-3.8-flash-tts", "input": ""}') f=Path(os.environ["AILOOT_TEXT_FILE"]) if not f.is_file():raise SystemExit("Choose your actual UTF-8 source material") text=f.read_text(encoding="utf-8") if not text.strip():raise SystemExit("Source material must contain text") p["input"]=text Path("request.json").write_text(json.dumps(p,ensure_ascii=False)) PY_REQUEST curl --fail-with-body --silent --show-error https://api.ailoot.ai/v1/audio/speech \ -H "Authorization: Bearer $AILOOT_API_KEY" -H 'Content-Type: application/json' \ --data-binary @request.json -D response-headers.txt -o speech.wav ``` ### Receive and save results #### Ailoot · Text to speech native audio bytes or JSON asset links - `GET /v1/media/tasks/{task_id}` - `GET /v1/media/assets/{asset_id}/content` - `GET /v1/media/assets` - `GET /v1/media/assets/{asset_id}` ##### Keep all completed results Keep every complete returned response, file and content part. A single output defaults to native audio bytes with actualContent-Type; response\_format=json or multiple outputs returns all owned links. No requested MP3/Opus/AAC/FLAC/PCM conversion or SSE. ##### If the original response needs checking Retain original operation\_id/X-Client-Request-ID for reconciliation without resubmission; no dedicated audio poll route. Response fields | Field | Type | | --- | --- | | Field`binary native audio` | Typebytes | | Field`model` | Typestring | | Field`response_id` | Typestring | | Field`actual_count` | Typeinteger | | Field`data[]` | Typeowned audio asset link | Errors and next steps | Response | Condition | Next step | | --- | --- | --- | | Response400 · `invalid_request_error` | ConditionInvalid required fields, material representation or parameter value | Next stepCorrect the indicated fields before a new creation request. | | Response`server_error` | ConditionThe returned response says the operation or result requires a check | Next stepKeep the original returned operation/task ID, request headers and response; continue supported reads of that original operation. Do not resubmit the creation request. | ### Aliases #### Model aliases **Ailoot** [`gemini-3.8-flash-tts`](https://ailoot.ai/models/en/#m=gemini-3.8-flash-tts&route=Core&caller=gemini-3.8-flash-tts&fmt=speech) #### Method path aliases Use the method paths shown above. #### Related caller IDs [`gemini-3.8-flash-tts`](https://ailoot.ai/models/en/#m=gemini-3.8-flash-tts&route=Core&caller=gemini-3.8-flash-tts&fmt=speech) FAQ · Gemini 3.8 Flash Tts What inputs and results are available? `POST /v1/audio/speech` · `gemini-3.8-flash-tts`: `text` → `audio` Which fields does the request use? `POST /v1/audio/speech` · `gemini-3.8-flash-tts`: `model`, `input`, `voice`, `response_format`, `stream_format` What limits apply? `POST /v1/audio/speech` · `gemini-3.8-flash-tts`: `ctx`: `8192`; `max_out`: `16384` Connect Ailoot to Claude Code, OpenCode, Hermes or your own app. ## The company and its project portfolio The company and its project portfolio: millions of customers; monthly sales in the billions. ## Buy tokens at a discount. 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