OpenAI Realtime API
Open-Source & Dev FrameworksOpenAI's API for low-latency speech-to-speech conversations.
- Price
- gpt-realtime-2.1-mini: audio $10 in / $20 out per 1M tokens
- Best for
- Developers building speech-to-speech voice agents directly on OpenAI models
Last verified against the vendor’s own page · How we verify
OpenAI Realtime API pricing breakdown
Per token (audio, text, image); some per-minute products
- gpt-realtime-2.1: audio $32 in ($0.40 cached) / $64 out per 1M tokens; text $4 in / $24 out
- gpt-realtime-2.1-mini: audio $10 in ($0.30 cached) / $20 out per 1M tokens; text $0.60 in / $2.40 out
- GPT-Live 1 sessions: $0.05/min, billed per second (backend model and tools extra)
- Live transcription (gpt-realtime-whisper): $0.017/min; live translation: $0.034/min
Key features
- Model works directly with audio, keeps conversation state and calls tools
- WebRTC in the browser or WebSocket on the server
- Barge-in, turn detection and tool use in one session
- Realtime API not priced separately; billed at model token rates