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Models overview

Four capabilities, seven models. Pick one and go.
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One API key, one base URL, four things you can do with speech and language.

Text to Speech

Stream natural speech with Lightning at 44.1 kHz and 200 ms to first byte.

Lightning v3.1 ProLightning v3.1
Speech to Text

Transcribe live or recorded audio with Pulse, 21 streaming languages.

Pulse 2.0PulsePulse Pro
Speech to Speech

Talk to Hydra over one WebSocket, audio in and audio out.

Hydra
LLM

Run Electron, an OpenAI-compatible model built for voice agents.

Electron

The models

Text to speech

Lightning v3.1 Pro

Premium voices, 31 languages.

Lightning v3.1

217 voices, cloning, 12 languages.

Speech to text

Pulse 2.0

English streaming, built-in turn detection, emotion, and gender.

Pulse

Streaming and batch, 21 streaming languages.

Pulse Pro

English batch, leaderboard accuracy.

Speech to speech

Hydra

Full-duplex speech to speech.

LLM

Electron

Chat completions, 70 languages.

Numbers side by side: Compare models.

Start building

Getting started

Create a key and make your first call in a minute.

API reference

Every endpoint with schemas and copyable snippets.

Plans and per-model rates are on the pricing page.