OpenAI TTS

by OpenAI

OpenAI text-to-speech with low-latency streaming voices for real-time assistants.

Get API Key Read the docs

Capabilities

Text to speech
Streaming

Available models

Pass any of these IDs in the model field.

Model ID	Detail	Price
openai-tts-2	per 1K chars	$0.015 / 1K chars

Pricing starts at

$0.015 / 1K chars

Pay only for what you use. Each response returns the exact amount settled against your balance — no subscriptions, no minimums.

Quickstart

OpenAI TTS · openai-tts-2

cURL

curl -X POST https://capi.ai/api/v1/audio/speech \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai-tts-2","input":"Welcome to CAPI."}' \
  --output out.mp3

More Audio models

View all

Audio

ElevenLabs

ElevenLabs API access for voice synthesis, text-to-speech, sound effects, speech-to-text, and audio isolation.

from $0.040 / 1K charsView

Audio

Fish Audio

Fish Audio API access for expressive multilingual and production-grade text-to-speech with managed MP3 or WAV output.

from $0.0000 / 1K UTF-8 bytesView

Audio

Gemini TTS

Google

Gemini TTS API access for multi-speaker dialogue with configurable voices, accents, delivery styles, and pacing.

from $0.0014 / 1K tokensView