OpenAI Realtime API (gpt-realtime) alternatives

Evaluating alternatives to OpenAI Realtime API (gpt-realtime)? These realtime voice agent apis are ranked by the same transparent, cited data-readiness score, with the reasons to consider each shown. No reviews, no paid placement.

Rankedby a transparent data-readiness score computed from each API's published, sourced fields. No reviews, no paid placement. How we rank.

ElevenLabs Conversational AI (ElevenAgents)
"Deploy human-like Conversational AI in minutes. ElevenLabs delivers low latency interactions in dozens of languages with enterprise-grade security."
Why consider it: transparent public pricing · a free tier · self-serve signup.
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Telnyx Voice AI Agents
"Carrier-grade Voice AI from Telnyx. Sub-200ms latency, 80+ languages, A-level STIR/SHAKEN attestation, and one platform that replaces 5 vendors."
Why consider it: transparent public pricing · self-serve signup · SOC 2 Type II.
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Twilio ConversationRelay
"Twilio's Conversation Relay empowers you to build powerful AI voice experiences for your customers. Let Twilio handle the heavy lifting of speech recognition, text-to-speech, and voice synthesis."
Why consider it: transparent public pricing · self-serve signup · SOC 2 Type II.
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Vapi
"Build and deploy voice agents that deliver the outcomes you want at the scale your customers need."
Why consider it: transparent public pricing · a free tier · self-serve signup.
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Cartesia Line
"Turn any text agent into a world-class conversational agent, deployed anywhere."
Why consider it: transparent public pricing · a free tier · self-serve signup.
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Pipecat Cloud (Daily)
"The fastest path to production voice AI" - a managed hosting platform for deploying and scaling Pipecat agents in production with built-in infrastructure.
Why consider it: transparent public pricing · self-serve signup · SOC 2 Type II.
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LiveKit Agents
"LiveKit is a developer platform for voice, video, and physical AI. Build agents with our open source SDKs, deploy them across a global network of data centers, and monitor them in production with realtime observability."
Why consider it: transparent public pricing · a free tier · self-serve signup.
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Bland AI
"Voice AI for regulated industries. Built for high-stakes phone calls where security and trust actually matter."
Why consider it: transparent public pricing · self-serve signup · SOC 2 Type II.
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Deepgram Voice Agent API
"A single, unified conversational AI API for building enterprise-ready, cost-effective voice AI agents."
Why consider it: transparent public pricing · self-serve signup · SOC 2 Type II.
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Retell AI
"#1 AI Voice Agent Platform for Automating Calls"
Why consider it: transparent public pricing · self-serve signup · SOC 2 Type II.
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Synthflow AI
"Enterprise-Ready Voice AI Agents for Automated Phone Calls"
Why consider it: transparent public pricing · self-serve signup · HIPAA.
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Ultravox
"Real-time, speech native voice AI"
Why consider it: transparent public pricing · self-serve signup · webhooks.
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