GPT Realtime 2

You can try GPT Realtime 2 without creating an account. Its browser playground turns typed text into speech using AI voices such as Alloy, Echo and Shimmer, so you can hear the output before writing any code.

Pricing is not something to plan around here, since no figures are given for the API.

GPT Realtime 2 is a text-to-speech API and playground that generates natural-sounding audio from text for developers and anyone prototyping voice features.

The API route runs through OpenRouter and uses the openai/gpt-audio model, which gives you a production-oriented path once the playground has convinced you.

Responses can be streamed, so audio can start playing before the whole clip is finished.

You also get transcript feedback and a choice of output formats.

The pairing is the useful part.

A developer can audition voices in the playground, then move the same setup into an app, voice-over workflow or other voice-enabled product through the API.

GPT Realtime 2 suits quick tests and builds that need speech from text.