Flash V2.5 | Realistic Voice & TTS API

ElevenLabs — Flash v2.5 Text-to-Speech

ElevenLabs Flash V2.5 text-to-speech model Generates natural-sounding speech from written text. Delivers clear pronunciation, smooth pacing, and expressive tone—ideal for voiceovers, narration, and digital content. We offer a rich, built-in library of multi-lingual voices.

🎧 Key Features

Fast generation with consistent, humanlike intonation and timing
Multilingual capability with strong English number/date reading
Fine control of timbre and delivery via similarity and stability
Speaker Boost for crisper English numerals, times, and measurements
Large built-in voice library; supports your custom voice IDs. See voice list here

💰 Pricing

$0.05 per 1,000 characters
If the input length is less than 1000 characters, it will be counted as 1000 characters to pay.

🚀 How to Use

Enter your script in the text field.
Set voice_id to a built-in or custom voice (for example: Gigi, Callum, Alice). See the full catalog in the voice list above.
Tune delivery with the optional controls • similarity: 0–1 (higher = closer to the base voice’s timbre) • stability: 0–1 (higher = more consistent delivery) • use_speaker_boost: improves English number and unit reading
Click Run to synthesize and preview your audio.

📝 Notes

Output format on the platform is MP3.
Split very long text into smaller paragraphs for more stable prosody.
Punctuation guides rhythm—prefer clear sentences over run-ons.
voice_id must be valid; if you see a voice error, pick one from the official voice list.
For financial, time, or measurement content, keep use_speaker_boost enabled for best readability.

Flash v2.5 API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/elevenlabs/flash-v2.5 with your input as JSON. The endpoint returns a prediction id. Start polling the result endpoint around every 2 seconds, increase the interval for long-running tasks, and stop on any terminal status. On completed, read URLs from data.outputs. Examples for Flash v2.5 below.

HTTP example

# Submit the prediction
curl --fail-with-body --connect-timeout 10 --max-time 60 \
  -X POST "https://api.wavespeed.ai/api/v3/elevenlabs/flash-v2.5" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "voice_id": "Alice",
    "similarity": 1,
    "stability": 0.5,
    "use_speaker_boost": true
}'

# Wait at least 2 seconds, then poll. Safe GET requests may be retried.
curl --fail-with-body --connect-timeout 10 --max-time 30 \
  --retry 4 --retry-all-errors --retry-delay 1 \
  -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# Start at 2 seconds and increase the interval for long-running tasks.
# Stop on completed, failed, cancelled, or timeout.

Node.js example

// npm install wavespeed
const { Client } = require('wavespeed');

const apiKey = process.env.WAVESPEED_API_KEY;
if (!apiKey) throw new Error('Set WAVESPEED_API_KEY');
const client = new Client(apiKey);

try {
  const result = await client.run("elevenlabs/flash-v2.5", {
        "voice_id": "Alice",
        "similarity": 1,
        "stability": 0.5,
        "use_speaker_boost": true
}, {
    timeout: 3600,
    pollInterval: 2.0,
  });
  console.log(result.outputs);
} catch (error) {
  console.error('Generation failed:', error);
  process.exitCode = 1;
}

Python example

# pip install wavespeed
import os
from wavespeed import Client

client = Client(api_key=os.environ["WAVESPEED_API_KEY"])

try:
    output = client.run(
        "elevenlabs/flash-v2.5",
        {
    "voice_id": "Alice",
    "similarity": 1,
    "stability": 0.5,
    "use_speaker_boost": true
},
        timeout=3600.0,
        poll_interval=2.0,
    )
    print(output["outputs"])
except Exception as error:
    raise SystemExit(f"Generation failed: {error}") from error

Flash v2.5 API — Frequently asked questions

What is the Flash v2.5 API?

Flash v2.5 is a ElevenLabs model for audio generation, exposed as a REST API on WaveSpeedAI. ElevenLabs Flash v2.5 is a text-to-speech model on WaveSpeedAI, billed at $0.05 per 1000 characters for generated speech. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Flash v2.5 API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID. Poll the result endpoint starting around every 2 seconds, increase the interval for long-running tasks, and stop on any terminal status. The playground generates production-oriented Python, JavaScript, and cURL examples with timeouts, transient-error handling, and safe GET retries. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/elevenlabs/elevenlabs-flash-v2.5.

How much does Flash v2.5 cost per run?

Flash v2.5 starts at $0.050 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Flash v2.5 accept?

Key inputs: `similarity`, `stability`, `text`, `use_speaker_boost`, `voice_id`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/elevenlabs/elevenlabs-flash-v2.5.

How long does Flash v2.5 take to generate?

Average end-to-end generation time on WaveSpeedAI is around 3 seconds per request — measured across recent runs. Queue time scales with global demand; live status is visible in the prediction record.

Can I use Flash v2.5 outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (ElevenLabs). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

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