ElevenLabs TTS API

2026년 10월 19일 업데이트

What is ElevenLabs TTS?

ElevenLabs TTS turns text into natural-sounding speech, with four model variants on the same endpoint. Send the text and a voice ID and the call works; everything else is optional. The four models trade latency, language coverage, and character cap: Flash v2.5 returns first audio in roughly 75 ms across 32 languages, Turbo v2.5 sits at about 250 ms with stronger quality, Multilingual v2 covers 29 languages at the highest quality with a 10,000-character cap, and V3 reaches 70+ languages with the most dramatic delivery. Output formats span compressed MP3 and Opus, full-rate WAV, raw PCM, and 8 kHz μ-law and a-law for telephony. That coverage is what makes the same endpoint usable for both consumer-facing playback and IVR pipelines.

Key features of ElevenLabs TTS

Five features cover the surface area you'll touch in a real production pipeline.

What ElevenLabs is best for

• Real-time voice agents and IVR

  Flash v2.5 keeps end-to-end latency low and the ulaw_8000 / alaw_8000 outputs drop straight onto Twilio and other 8 kHz voice circuits.

• Audiobooks and long-form narration

  Multilingual v2 plus a locked seed produces consistent voice across chapters; the 10,000-character cap fits a typical chapter in a single call.

• Localized release work

  Multilingual v2 covers 29 languages, V3 reaches 70+. Mix variants per locale to balance quality and language coverage in one pipeline.

• Game and app character lines

  Pass the same seed and voice settings per character and lines stay consistent across retakes during patch cycles.

• Assistive playback for UI strings

  Lock voice and settings per locale and TTS becomes a deterministic component of an accessible product.

• Trailer narration and explainer voiceover

  V3 with style turned up adds the dramatic delivery promo content needs without manual ADR.

ElevenLabs variants

Four model variants share one endpoint. Pick by the latency, quality, and language coverage you need.

Flash v2.5

First audio in ~75 ms, 32 languages, 40,000 characters per call. Use it for live voice agents, IVR, and any pipeline where end-to-end latency is the headline constraint.

Turbo v2.5

First audio in ~250 ms, 32 languages, 40,000 characters per call. Same broad language coverage as Flash with stronger quality. Good when you can wait through a quarter-second of extra latency and want a richer voice on the other end.

Multilingual v2

29 languages, 10,000 characters per call. The default for long-form narration. Pair it with a locked seed and you get consistent voice across chapters, episodes, and series, with no drift between calls.

V3

70+ languages, 5,000 characters per call. The most expressive of the four, with the biggest dynamic range and the most dramatic delivery. Use it for trailer narration, promo VO, and any cut where the voice has to carry the video.

How does ElevenLabs TTS sound? Flash v2.5 vs V3 on the same line

The quickest way to answer an "elevenlabs tts" search is to play it. Both clips below are real outputs from this endpoint, generated on October 19, 2026 through the UnificAlly MCP with the same 210-character text and the same voice (TX3LPaxmHKxFdv7VOQHJ, the premade voice Liam), default voice_settings, output_format mp3_44100_128. Only model_id changed.

Flash v2.5 (eleven_flash_v2_5, 11.4 s of audio, billed at $0.024/1000 characters):

Eleven V3 (eleven_v3, 10.4 s of audio, billed at $0.048/1000 characters):

The text: "Welcome back. Your order shipped this morning and should arrive by Thursday. If you need to change the delivery address, reply to this message or call us any time. Thanks for choosing us, and have a great week." At 210 characters each render cost a fraction of a cent; the per-1,000-character rates above are what scale.

V3 reads the same line about a second shorter, which is the pacing difference you hear between a transactional voice and the more expressive model. For an IVR or a notification, Flash v2.5 at half the rate is the right default. For narration where delivery carries the content, V3 earns its rate.

ElevenLabs TTS vs Eleven v4 vs Grok TTS

The two text-to-speech routes most often searched next to this one, on the same key. Rates are UnificAlly's per 1,000 characters.

Choose this endpoint for the lowest latency and the widest format list, Eleven v4 when expressiveness and tags matter more than rate, and Grok TTS when you want the cheapest clean read in one of its 20 languages.

ElevenLabs use cases

Wire a real-time voice agent to Twilio in a day: call the TTS endpoint with output_format set to ulaw_8000, hand the buffer to your media stream, and Flash v2.5's first-audio latency keeps conversation natural. Produce a localized audiobook by writing one chapter generator that loops over locales and swaps between Multilingual v2 (29 languages) and V3 (70+) per market. Build deterministic in-game dialogue by binding each NPC to a fixed voice plus a fixed seed and settings profile. Layer accessible UI playback by pre-rendering common strings server-side and caching the resulting audio URLs.

ElevenLabs API examples

Call ElevenLabs TTS from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/audio/elevenlabs/text-to-speech.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "elevenlabs/text-to-speech",
    "input": {
      "text": "Hello world, this is a test.",
      "voice": "TX3LPaxmHKxFdv7VOQHJ",
      "model_id": "eleven_flash_v2_5",
      "output_format": "mp3_44100_128"
    }
  }'

Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished audio URL.

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ElevenLabs API pricing

ElevenLabs API pricing: TTS from $0.024 per 1K characters on UnificAlly, plus sound effects, dialogue and STT costs. Pay per use, no subscription.

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