Polly Long-form

amazon/polly-long-form

Polly engine for long passages such as articles and training material, launched November 2023; six voices (four US English, two Castilian Spanish), us-east-1 only, with speech marks. No voices have been added since November 2024.

Get API Key Read the Docs

curl "$AUDIOLAB_API_URL/v1/audio/speech" \
  -H "Authorization: Bearer $AUDIOLAB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "amazon/polly-long-form",
  "input": "Make every word count.",
  "voice": "auto",
  "response_format": "mp3"
}' --output speech.mp3

Input Price: $85.00 / 1M characters
Output Price: —
Input: Text
Output: Audio

Capabilities

Explore what Polly Long-form supports, then use the API section for a request tailored to this model.

BatchStreamVoicesSsmlSpeech marks

Languages

EnglishSpanish

Model Information

Provider: Amazon Web Services
Product: Text-to-Speech
Release Date: Nov 16, 2023
Data Policy: No training
Region: US
Input: Text
Output: Audio

Provider Documentation

Playground

Try Polly Long-form by Amazon Web Services. Requests use the selected workspace’s credits and API pricing.

Polly Long-form

Providers

Compare available endpoints, pricing, and context limits for Polly Long-form.

Provider	Context	Output	Input Price	Output Price	Endpoint
Amazon Web Services	Not specified	Audio	$85.00 / 1M characters	—	`amazon/polly-long-form:amazon`

Prices are catalog rates. Your workspace’s estimate and endpoint pricing determine the final charge.

Input and Output Limits

Formats and limits AudioLab enforces on each request.

Limit	Value
Max chars	3000
Max total chars	6000
Formats	mp3, ogg, opus, pcm, ulaw, alaw, json

Provider Notes

One-shot requests stream Polly's response body and support MP3, Ogg Opus, Ogg Vorbis, raw PCM, μ-law, A-law, SSML, lexicons, and JSON speech marks where the selected engine allows them. Speech marks replace audio and are unavailable on the generative engine. The generative model also supports AudioLab's bidirectional WebSocket in Polly's supported streaming regions. Long-form is limited to us-east-1; generative and neural availability are region-specific.

Performance

Uptime100%

Time to First AudioMedianP90754 ms

Throughput—

Performance

Status

Current catalog availability. Your workspace’s access is checked separately before a request runs.

Checking availability…

A live availability check is not available right now.

Getting Started

Use your workspace API key and the exact model identifier below. Set the API URL to the endpoint shown in your workspace and keep credentials on your server.

curl "$AUDIOLAB_API_URL/v1/audio/speech" \
  -H "Authorization: Bearer $AUDIOLAB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "amazon/polly-long-form",
  "input": "Make every word count.",
  "voice": "auto",
  "response_format": "mp3"
}' --output speech.mp3

Read the Endpoint Reference

Request Parameters

Available parameters depend on the provider and request format. The endpoint reference explains accepted values and required fields.

Parameter	Details
`model`	`amazon/polly-long-form` — Required model identifier.
`language_code`	View Accepted Values
`lexicon_names`	View Accepted Values
`sample_rate`	View Accepted Values
`speech_mark_types`	View Accepted Values
`text_type`	View Accepted Values

Input and Output Limits

Formats and limits AudioLab enforces on each request.

Limit	Value
Max chars	3000
Max total chars	6000
Formats	mp3, ogg, opus, pcm, ulaw, alaw, json

Similar Models

Explore more text-to-speech and compare their capabilities.

Model	Context	Input Price	Output Price
Polly GenerativeAmazon Web Services	Not specified	$25.50 / 1M characters	—
Polly NeuralAmazon Web Services	Not specified	$13.60 / 1M characters	—
Polly StandardAmazon Web Services	Not specified	$3.40 / 1M characters	—
Sonic 3.6Cartesia	Not specified	$38.25 / 1M characters	—
Sonic 3.6 (2026-08-27)Cartesia	Not specified	$38.25 / 1M characters	—
tts-rt-v2Soniox	Not specified	$11.985 / 1M characters	—

View All Text-to-Speech