Skip to main content
Text to Speech

OpenAI GPT-4o mini Text-to-Speech

Generate high-quality speech from text using GPT-4o mini TTS model. Control voice, tone, accent, emotion, and speed with natural instructions. Supports 13 built-in voices (recommended: marin, cedar). Maximum 4096 characters per request.

View details
Try it in Ampere

Inputs

Loading input fields...
Execution Steps

Loading workflow structure...

Loading curated examples...

Overview

OpenAI GPT-4o mini Text-to-Speech turns up to 4,096 characters of text into speech audio with a built-in OpenAI voice, speed control, output format, and natural-language voice instructions. Use it for voiceover drafts, narration, product-demo scripts, and ad reads when instructions for tone, accent, emotion, or delivery style matter.

Use cases

  • Generate a spoken product-demo, ad, explainer, or podcast script from text.
  • Test voice direction with instructions such as cheerful, calm, whispered, or accented delivery.
  • Produce MP3, WAV, FLAC, AAC, Opus, or PCM output for different handoff needs.
  • Compare built-in voices before committing to an audio direction.

Input tips

  • Keep input under 4,096 characters.
  • Choose one built-in voice; marin and cedar are recommended in the workflow.
  • Use instructions for tone, accent, emotion, pacing, or delivery style.
  • Set speed from 0.25-4.0 only when pacing needs to change.
  • Choose response_format when a specific audio format matters; mp3 is the default.

Expected output

The AI Tool returns one generated speech audio file with a downloadable URL, content type, file size, and cost metadata. The output view renders an audio player and shows the OpenAI GPT-4o mini TTS provider label, format, and file size.

Caveats

  • Generated speech should be reviewed for pronunciation, pacing, tone, and brand fit.
  • Natural-language instructions guide delivery but may not produce exact accents, emotion, or performance.
  • This AI Tool returns audio only; it does not return timing JSON, transcripts, or voice IDs.
  • Very long scripts need to be split into separate runs because input is capped at 4,096 characters.
  • Built-in voices are fixed options; use another TTS AI Tool when custom or cloned voices are needed.

Related AI Tools