Google: Gemini 3.8 Flash TTS

google/gemini-3.8-flash-tts

Last Observed: 2026-10-15 06:03:54.724938 UTC

Gemini 3.8 Flash TTS is a text-to-speech model from Google and the successor to [Gemini 3.1 Flash TTS Preview](https://openrouter.ai/google/gemini-3.1-flash-tts-preview). It is the creative tier of the 3.8 TTS family, suited...

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Architecture And Modalities · 3

Architecture · Instruct Type API Details /architecture/instruct_type Explicit Null	Explicit Null
Architecture · Modality API Details /architecture/modality text->speech	text->speech
Architecture · Tokenizer API Details /architecture/tokenizer Gemini	Gemini

Catalog Identity And Metadata · 10

Canonical Slug API Details /canonical_slug google/gemini-3.8-flash-tts-20260922	google/gemini-3.8-flash-tts-20260922
Context Tokens API Details /context_length 32768	32,768
Created API Details /created 1790200266	2026-09-23 21:51:06 UTC
Description API Details /description Gemini 3.8 Flash TTS is a text-to-speech model from Google and the successor to [Gemini 3.1 Flash TTS Preview](https://openrouter.ai/google/gemini-3.1-flash-tts-preview). It is the creative tier of the 3.8 TTS family, suited...	Gemini 3.8 Flash TTS is a text-to-speech model from Google and the successor to [Gemini 3.1 Flash TTS Preview](https://openrouter.ai/google/gemini-3.1-flash-tts-preview). It is the creative tier of the 3.8 TTS family, suited...
Expiration Date API Details /expiration_date Explicit Null	Explicit Null
Hugging Face Id API Details /hugging_face_id Explicit Null	Explicit Null
Id API Details /id google/gemini-3.8-flash-tts	google/gemini-3.8-flash-tts
Knowledge Cutoff API Details /knowledge_cutoff Explicit Null	Explicit Null
Links · Details API Details /links/details /api/v1/models/google/gemini-3.8-flash-tts-20260922/endpoints	/api/v1/models/google/gemini-3.8-flash-tts-20260922/endpoints
Name API Details /name Google: Gemini 3.8 Flash TTS	Google: Gemini 3.8 Flash TTS

Request Limits · 1

Per Request Limits API Details /per_request_limits Explicit Null	Explicit Null

Pricing · 2

Output Price · USD/Token API Details /pricing/completion 0.000009	0.000009
Input Price · USD/Token API Details /pricing/prompt 0.0000005	0.0000005

Provider Limits · 3

Top Provider · Context Length API Details /top_provider/context_length 32768	32,768
Top Provider · Is Moderated API Details /top_provider/is_moderated False	False
Top Provider · Max Completion Tokens API Details /top_provider/max_completion_tokens 16384	16,384

API Structure And Container Types

Architecture API Details /architecture Object · See Fields	Object · See Fields
Architecture · Input Modalities API Details /architecture/input_modalities Array · See Items	Array · See Items
Architecture · Output Modalities API Details /architecture/output_modalities Array · See Items	Array · See Items
Benchmarks API Details /benchmarks Object · See Fields	Object · See Fields
Benchmarks · Design Arena API Details /benchmarks/design_arena Array · See Items	Array · See Items
Default Parameters API Details /default_parameters Object · See Fields	Object · See Fields
Links API Details /links Object · See Fields	Object · See Fields
Pricing API Details /pricing Object · See Fields	Object · See Fields
Supported Parameters API Details /supported_parameters Array · See Items	Array · See Items
Supported Voices API Details /supported_voices Array · See Items	Array · See Items
Top Provider API Details /top_provider Object · See Fields	Object · See Fields

Architecture · Input Modalities

1 items · source order preserved

text

API Details

Item	/architecture/input_modalities/*
1	text

Architecture · Output Modalities

1 items · source order preserved

speech

API Details

Item	/architecture/output_modalities/*
1	speech

Supported Parameters

0 items · source order preserved

Empty list

Benchmarks · Design Arena

2 items · source order preserved

Item	Arena	Category	Elo	Rank	Win Rate
1	models	audiorealism	1070	3	46.7
2	models	text-to-speech	1457	1	77.1

API Details

Item	/benchmarks/design_arena/*/arena	/benchmarks/design_arena/*/category	/benchmarks/design_arena/*/elo	/benchmarks/design_arena/*/rank	/benchmarks/design_arena/*/win_rate
1	models	audiorealism	1070	3	46.7
2	models	text-to-speech	1457	1	77.1

Supported Voices

30 items · source order preserved

Zephyr
Puck
Charon
Kore
Fenrir
Leda
Orus
Aoede
Callirrhoe
Autonoe
Enceladus
Iapetus
Umbriel
Algieba
Despina
Erinome
Algenib
Rasalgethi
Laomedeia
Achernar
Alnilam
Schedar
Gacrux
Pulcherrima
Achird
Zubenelgenubi
Vindemiatrix
Sadachbia
Sadaltager
Sulafat

API Details

Item	/supported_voices/*
1	Zephyr
2	Puck
3	Charon
4	Kore
5	Fenrir
6	Leda
7	Orus
8	Aoede
9	Callirrhoe
10	Autonoe
11	Enceladus
12	Iapetus
13	Umbriel
14	Algieba
15	Despina
16	Erinome
17	Algenib
18	Rasalgethi
19	Laomedeia
20	Achernar
21	Alnilam
22	Schedar
23	Gacrux
24	Pulcherrima
25	Achird
26	Zubenelgenubi
27	Vindemiatrix
28	Sadachbia
29	Sadaltager
30	Sulafat

Recorded Value History

Historical API Field

Input Price · USD/Token

5 of 5 records plotted · 0 excluded for missing or invalid coordinates.

Up to 100 recorded versions, spaced by observation order rather than elapsed time. Array fields use the minimum numeric item in each version. Missing values are omitted. Select a point to open its archived snapshot; comparison actions use the current listing. History begins at the first recorded baseline.

Axis Scale

Select a point to open its listing or add it to compare.

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