Gemini 3.1 Flash TTS Preview

Audio output

Website

Low-latency speech generation with steerable prompts and expressive audio tags

Context: 33K
Released: 6mo ago
Input / 1M tokens: $1.00
Output / 1M tokens: $20.00

Sources:models.devOpenRouter

Benchmarks

DeepSWE is the primary coding benchmark where an exact model evaluation exists. Other sourced evaluations appear below; missing scores are not zero.

Not evaluated in DeepSWE 1.1 as of 2026-09-22. Results are only shown for exact model versions in the official dataset. Official leaderboard.

No benchmark results have been matched to this model yet.

Specifications

Developer: Google DeepMind
Model family: Gemini
Type: Language model
Predecessor: —
Successor: —
Released: April 15, 2026
Model ID: google/gemini-3.1-flash-tts-preview
Openness: Closed
License: —
Input modalities: text
Output modalities: speech
Modality: text->speech
Tokenizer: Gemini
Max output tokens: 16K
Knowledge cutoff: 2025-01
Hugging Face: —
Source freshness: Metadata synced Oct 8, 2026, 10:17 PM UTC

Additional source evidence

Source model: google/gemini-3.1-flash-tts-preview
Source family: gemini-flash
Last updated: 2026-04-15
Knowledge cutoff: 2025-01
Model context: 8K
Model output limit: 16K
Open weights: No
File attachments: No
Reasoning: No
Tool calling: No
Temperature control: Yes

Complete source record (JSON)

{
  "id": "google/gemini-3.1-flash-tts-preview",
  "name": "Gemini 3.1 Flash TTS Preview",
  "description": "Low-latency speech generation with steerable prompts and expressive audio tags",
  "family": "gemini-flash",
  "last_updated": "2026-04-15",
  "knowledge": "2025-01",
  "attachment": false,
  "reasoning": false,
  "tool_call": false,
  "temperature": true,
  "modalities": {
    "input": [
      "text"
    ],
    "output": [
      "audio"
    ]
  },
  "limit": {
    "context": 8192,
    "output": 16384
  },
  "release_date": "2026-04-15",
  "open_weights": false
}

Infrastructure

Provider availability

All providers

Provider	Endpoint	Context	Input /M tokens	Output /M tokens	Cached input /M tokens	Cache write /M tokens	Uptime 1d	Data handling
Google	google-vertex/us-central1	33K	$1.00	$20.00	—	—	100.00%	ZDR: Yes Training: Unknown Prompt logging: Unknown Retention: Unknown ZDR source Privacy policy Checked 2026-10-15

Provider data:OpenRouter

Text provenance

Gemini app/web

Google SynthID text watermarking

Google DeepMind says text generated in the Gemini app and web experience is watermarked with SynthID by adjusting token probabilities.

Official explanation