Best OpenAI Realtime API alternatives.
Live source-backed alternatives to OpenAI Realtime API for Voice agents. Alternatives are selected from the same task category and update whenever the best-of index rebuilds.
OpenAI Realtime API
Official OpenAI realtime audio API path for low-latency voice agents, speech-to-speech sessions, transcription, translation, and spoken responses. official_service speech-to-speech voice agent realtime voice live audio conversation api audio text multimodal api hosted webrtc websocket tool calling turn-taking audio input audio output
Gemini Live API
Matched voice agent, realtime voice, real-time voice; 2 source links; official service signal; access model: Paid API
Hume Empathic Voice Interface
Matched voice agent, realtime voice, speech-to-speech; 2 source links; official service signal; access model: Paid API
| # | Alternative | Kind | Access | Fit | Why it appears | Source |
|---|---|---|---|---|---|---|
| 01 | Gemini Live API | service | Paid API | Score100 | Matched voice agent, realtime voice, real-time voice; 2 source links; official service signal; access model: Paid API | ai.google.dev |
| 02 | Hume Empathic Voice Interface | service | Paid API | Score88 | Matched voice agent, realtime voice, speech-to-speech; 2 source links; official service signal; access model: Paid API | dev.hume.ai |
| 03 | LiveKit Agents | service | Paid API | Score88 | Matched voice agent, realtime voice, telephony agent; 2 source links; official service signal; access model: Paid API | docs.livekit.io |
| 04 | Deepgram Speech AI | service | Paid API | Score79 | Matched voice agent, voice agents, realtime voice; 2 source links; official service signal; access model: Paid API | deepgram.com |
| 05 | Gemini Live Translation | service | Paid API | Score75 | Matched live audio, speech-to-speech, speech to speech; 1 source link; official service signal; access model: Paid API | ai.google.dev |
| 06 | Google Gemini API | service | Paid API | Score74 | Matched voice agent, live audio; 2 source links; official service signal; access model: Paid API | ai.google.dev |
| 07 | Cartesia Voice API | service | Paid API | Score73 | Matched voice agent, realtime voice; 2 source links; official service signal; access model: Paid API | docs.cartesia.ai |
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