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OpenAI Text-to-Speech

developers.openai.com

From $0.60/mo API
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Spec score 8.3 #74 of 233 in Text-to-speech tools

Spec sheet

What it does
The GPT-4o Mini TTS model converts text into natural sounding spoken text through the speech generation API endpoint.Read 7 Oct 2026 · developers.openai.com
Platforms
apiRead 20 Sep 2026 · developers.openai.com
Security
OpenAI says API Platform data is encrypted at rest with AES-256 and in transit with TLS 1.2 or higher, and that the API Platform is SOC 2 Type 2 audited.Read 7 Oct 2026 · openai.com
Maker
OpenAI describes itself as an AI research and deployment company.Read 7 Oct 2026 · openai.com
API access
YesRead 20 Sep 2026 · developers.openai.com
API integration
The guide provides examples using OpenAI SDKs for JavaScript, Python, Go, Java, Ruby, and the command line.Read 7 Oct 2026 · developers.openai.com
Commercial use
YesRead 20 Sep 2026 · developers.openai.com
Custom voices
An approved custom voice can be created from a speaker’s consent recording and matching audio sample, subject to eligibility and recording requirements.Read 7 Oct 2026 · developers.openai.com
Data use and retention
OpenAI says API Platform data is not used for model training by default and that API inputs and outputs may be retained for up to 30 days, with zero data retention available for eligible endpoints and qualifying use cases.Read 7 Oct 2026 · openai.com
Export formats
mp3,opus,aac,flac,wav,pcmRead 20 Sep 2026 · developers.openai.com
Languages
57Read 20 Sep 2026 · developers.openai.com
Languages
The TTS model can generate spoken audio in the languages listed in the guide by supplying text in the desired language.Read 7 Oct 2026 · developers.openai.com
Maximum input
4096Read 20 Sep 2026 · developers.openai.com
Model input limit
The model page states a maximum input size of 2,000 tokens.Read 7 Oct 2026 · developers.openai.com
Output formats
The default response format is MP3, and supported formats include Opus, AAC, FLAC, WAV, and PCM.Read 7 Oct 2026 · developers.openai.com
Speech controls
With gpt-4o-mini-tts, instructions can control accent, emotional range, intonation, impressions, speech speed, tone, and whispering.Read 7 Oct 2026 · developers.openai.com
Speech uses
The guide lists narrating written blog posts, producing spoken audio in multiple languages, and realtime audio output using streaming as example uses.Read 7 Oct 2026 · developers.openai.com
Streaming
Speech API chunked audio streaming lets playback begin before the complete file is generated.Read 7 Oct 2026 · developers.openai.com
User disclosure
OpenAI usage policies require clear disclosure to end users that the TTS voice they hear is AI-generated and not a human voice.Read 7 Oct 2026 · developers.openai.com
Voice cloning
YesRead 20 Sep 2026 · developers.openai.com
Voices
The guide lists 13 built-in voices and recommends marin or cedar for best quality; voices are currently optimized for English.Read 7 Oct 2026 · developers.openai.com

Plans and prices

TTS-1 $15 a month Text-to-speech model optimized for speed · Speech generation through the Audio API Read 20 Sep 2026 · developers.openai.com
TTS-1 HD $30 a month Higher-quality text-to-speech model Read 20 Sep 2026 · developers.openai.com
GPT-4o Mini TTS API usage $0.60 a month per 1M text input tokens; audio output billed separately at $12.00 per 1M audio tokens maximum 2,000 input tokens · Free tier not supported Read 7 Oct 2026 · developers.openai.com

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