Gemini 3.8 Flash TTS
Summary
Gemini 3.8 Flash TTS is a proprietary speech model from Google DeepMind, released on 22 Sept 2026. It accepts text and generates audio, with a 8K-token context window and up to 16K output tokens per response. As of 21 Oct 2026, the lowest listed API price is $0.50 per million input tokens and $9 per million output tokens (Vercel AI Gateway), across 1 provider we track.
Flagship text-to-speech model for expressive, studio-grade voices and long-form multi-speaker audio
Last verified 21 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Google DeepMind |
|---|---|
| Release date | 22 Sept 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 8K (8,192 tokens) [models.dev] |
| Max output | 16K tokens [models.dev] |
| Input | Text [models.dev] |
| Output | Audio [models.dev] |
| Reasoning mode | No [models.dev] |
| Tool calling | No [models.dev] |
Gemini 3.8 Flash TTS API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| Vercel AI Gateway google/gemini-3.8-flash-tts | $0.50 | $9 | – | 8K | models.dev, 21 Oct 2026 |
Frequently asked questions
What is the context window of Gemini 3.8 Flash TTS?
Gemini 3.8 Flash TTS has a context window of 8,192 tokens (8K) and can generate up to 16,384 tokens in a single response, according to models.dev.
How much does the Gemini 3.8 Flash TTS API cost?
Gemini 3.8 Flash TTS is listed from $0.50 per million input tokens and $9 per million output tokens (Vercel AI Gateway). Prices last verified 21 Oct 2026.
Is Gemini 3.8 Flash TTS open source?
No. Gemini 3.8 Flash TTS is a proprietary model; Google DeepMind has not released its weights. It is available through APIs including Vercel AI Gateway.
When was Gemini 3.8 Flash TTS released?
Google DeepMind released Gemini 3.8 Flash TTS on 22 Sept 2026, according to models.dev.
Change history
- Context window changed from none to 8K
- Max output changed from none to 16K
- Added to the directory
- Now listed on Vercel AI Gateway