Audio Gen · Model Guide · 4 min read
OpenAI Audio (TTS & Speech APIs)
Simple, high-quality speech generation and transcription through the OpenAI API ecosystem.
| Developer | OpenAI |
|---|---|
| Availability | Cloud only |
| Commercial license | Commercial use of generated audio is permitted under OpenAI's usage terms; you may not use the service to impersonate real people without consent. Enterprise agreements add compliance terms — check them for call-center style deployments. |
Basic Information
OpenAI's audio APIs cover text-to-speech (multiple natural voices, streaming), speech-to-text (Whisper-lineage transcription), and realtime voice agents — all behind the same familiar OpenAI SDK you use for text. The appeal is integration: if your product already speaks to OpenAI models, adding lifelike narration or a voice interface is a few lines of code.
Quality sits in the very-good tier — below ElevenLabs' best voices for expressiveness, but extremely reliable, fast, and priced per character/minute with no minimum commitment.
Best use cases
- Reading assistants and IVR/phone systems needing dependable TTS
- Narration pipelines inside apps already built on OpenAI models
- Realtime voice agents (support, concierge) with the realtime API
- Batch audiobook production with simple per-character pricing
Computational Requirements
None — API-only, metered per character (TTS) or per minute (transcription).
- Fully offline alternative: Kokoro TTS for speech (Apache 2.0) or Whisper running locally via Ollama-adjacent tools for transcription.
Commercial license
Commercial use of generated audio is permitted under OpenAI's usage terms; you may not use the service to impersonate real people without consent. Enterprise agreements add compliance terms — check them for call-center style deployments.
Compare the cost of using it
Curious how a hosted model’s bills add up against local hardware? The Local vs Cloud panel does the math for your workload.
More guides: back to Audio Gen · visit the blog