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#2 in Voice & Audio

OpenAI Realtime API

Low-latency speech-to-speech API.

paid Usage-based API pricing (per audio token)

Best for: Building real-time voice agents

Visit OpenAI Realtime API ↗ https://developers.openai.com/api/docs/guides/realtime

Pricing verified Oct 22, 2026 against the official source.

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