Features
- Converts text to expressive human-like speech with gpt-4o-mini-tts
- Offers multiple voices to choose from
- Controls delivery style such as tone, enthusiasm, formality or calmness
- Shows the matching API code for each tested voice setting
- Supports streaming for voice chat and real-time interactive apps
- Converts large amounts of text to audio files automatically via the API
Pricing Details
The OpenAI.fm platform itself is completely free and dedicated to demonstration and experimentation, offering unlimited interactive experiences via the website, with the ability to test all available voices and expression styles, and view ready-made code examples at no cost. Actual use within commercial applications and products is done through an OpenAI API account with a pay-as-you-go system. Prices include the tts-1 model at approximately $15 per million characters, the tts-1-hd model with higher sound quality at approximately $30 per million characters, and the gpt-4o-mini-tts model, which offers a practical balance between low price and advanced control over tone and vocal expression.