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AssemblyAI: TTS 1

Source description (English)

AssemblyAI TTS 1 is a text-to-speech model from AssemblyAI. It is suited for voice agents, narration, and multilingual applications, and draws on a public library of several thousand voices across...

View source on OpenRouter
Overview

Model specifications

Context
Not provided
Maximum output
Not provided
Architecture
text->speech
Tokenizer
Other
Knowledge cutoff
Not provided
Moderated
No
OPENROUTER

Complete pricing

Synchronized OpenRouter rates. Token prices are shown per one million tokens.

Characters
$15
per million characters
API

Model configuration

Supported voices

aai-janeaai-albaaai-annaaai-charlesaai-eveaai-georgeaai-jeanaai-maryaai-michaelaai-paulaai-vera
API

Quick start

Set OPENROUTER_API_KEY locally. Python requires requests; JavaScript runs in Node.js. Keep the key on the server.

Choose a supported voice. Replace YOUR_VOICE_ID if no voice is listed.

API documentation

curl --fail-with-body https://openrouter.ai/api/v1/audio/speech \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"assemblyai/assemblyai-tts-1","input":"Hello!","voice":"aai-jane","response_format":"mp3"}' \
  --output speech.mp3
Capabilities

Input → Output

Input
text
Output
speech
API

Supported API parameters

Available providers

2 providers

Checked: October 29, 2026

Live providers on OpenRouter

Provider availability, latency, throughput and routing can change continuously. Open the source page for current operational data.

OpenRouter

AssemblyAI

Not provided
Context
Not provided
Maximum output
Not provided

AssemblyAI

Not provided
Context
Not provided
Maximum output
Not provided
assemblyai

2 models

All models
assemblyai logoassemblyai

AssemblyAI: Universal-3.6 Pro

Universal-3.6 Pro is AssemblyAI's speech-to-text model and the successor to Universal-3.5 Pro, served here through AssemblyAI's Sync API. Compared with Universal-3.5 Pro, AssemblyAI reports 30% fewer errors on short conversational...

Context
Not provided
Input
audio
Output
transcription
Audio seconds: $0.000083 per secondAudio Seconds (Prompted): $0.000097 per second
View model details →
assemblyai logoassemblyai

AssemblyAI: Universal-3.5 Pro

Universal-3.5 Pro is AssemblyAI's speech-to-text model served through its Sync API, returning a complete transcript with word-level timestamps in a single synchronous response for audio up to 20 minutes. It...

Context
Not provided
Input
audio
Output
transcription
Audio seconds: $0.000083 per secondAudio Seconds (Prompted): $0.000097 per second
View model details →