Google: Gemini 2.5 Flash TTS

Speech generation model for controllable voice, narration, and audio delivery

Model lab: Google
Model family: gemini-flash

Modalitiestext → audio

Context window32,768

Maximum output16,384

InputUSD 0.4 / 1M tokens

OutputUSD 8 / 1M tokens

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Quickstart

Use your Moduck API Key, set the API base URL to https://api.moduck.ai/v1, and set the model parameter to google/gemini-2.5-flash-tts.

import os
import requests

base_url = "https://api.moduck.ai/v1"
api_key = os.environ["MODUCK_API_KEY"]
model_id = "google/gemini-2.5-flash-tts"

response = requests.post(
    f"{base_url}/chat/completions",
    headers={
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json",
    },
    json={
        "model": model_id,
        "messages": [{"role": "user", "content": "Hello!"}],
        "stream": False,
    },
    timeout=60,
)
response.raise_for_status()
print(response.json())

Use the familiar OpenAI-style chat request format to make model integration easier.

Gemini 2.5 Flash TTS API Pricing

Type	Price information
Input	USD 0.4 / 1M tokens
Output	USD 8 / 1M tokens

Performance

Performance trends

Audio throughput1.6 audio min/minCurrent

Queue wait0.4 sCurrent

Completion time9.3 sCurrent

Audio throughput

Current1.6 audio min/min

Window average1.5 audio min/min

Queue wait

Current0.4 s

Window average0.5 s

Completion time

Current9.3 s

Window average9.0 s

Tail completion time (P99)

Current27.2 s

Window average19.1 s

Retry rate

Current0.9%

Window average1.0%

Error rate

Current0.0%

Window average0.1%

Availability

Uptime100%At least one provider responded

Availability100%Requests actually served

Error rate0%Share of failed requests

Served requests, hour by hour

24 hours agoNow

Gemini 2.5 Flash TTS Compare models

Model	Input price	Output price	Context window	Capabilities
Gemini 2.5 Flash TTSThis page	USD 0.4 / 1M tokens	USD 8 / 1M tokens	32,768	Audio output
Gemini 3.1 Flash TTS Preview	USD 0.8 / 1M tokens	USD 16 / 1M tokens	8,192	Audio output
Gemini 2.5 Pro TTS	USD 0.8 / 1M tokens	USD 16 / 1M tokens	32,768	Audio output
Grok Voice TTS 1.0	USD 12 / 1M characters · Up to 15000 characters per request	Not billed on output	15,000	Audio output
Gemini 3.1 Flash Live Preview	USD 0.6 / 1M tokens	USD 3.6 / 1M tokens	131,072	Audio output · Reasoning · Tool calling

Model specifications

Input: text
Output: audio
Context window: 32,768
Maximum output: 16,384
Release date: 2025-09-30
Attachments: No
Reasoning: No
Tool calling: No
Temperature setting: Yes
Open weights: No

Frequently asked questions

What is Gemini 2.5 Flash TTS for?

Speech generation model for controllable voice, narration, and audio delivery

What inputs and outputs does Gemini 2.5 Flash TTS support?

Recorded inputs: text; outputs: audio.

How is Gemini 2.5 Flash TTS priced?

The pricing table shows the current recorded Moduck price. For example: Input USD 0.4 / 1M tokens; Output USD 8 / 1M tokens. See the pricing table for all units, variants, and conditions.

What specifications are recorded for Gemini 2.5 Flash TTS?

Current model records list Context window 32,768 tokens; Maximum output 16,384 tokens.

What model parameter does the Quickstart use?

The example uses google/gemini-2.5-flash-tts. This value comes from the page identifier and is not confirmed as a callable Moduck public ID.

Can I call this model through the Moduck API now?

This page has no verified Moduck API call for this model. A Quickstart example or reserved ID does not establish access; check the models available to your account.