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OpenAI Realtime API vs Vapi AI
This comparison was retrieved by database IDs selected from the catalog.
OpenAI Realtime API
OpenAI
Vapi AI
Vapi
Pay-as-you-go. Audio input $0.06/min, audio output $0.24/min (as of 2025). Text within realtime sessions at standard GPT-4o rates. No free tier.
Free plan with $10 credits. Pay-as-you-go from $0.05/minute. Volume discounts available. Enterprise custom.
Review OpenAI's data handling policy. Audio streams processed on OpenAI's infrastructure. Review Enterprise data handling terms for sensitive audio applications.
Review Vapi's data handling policy. Call audio, transcripts, and user data processed on Vapi's infrastructure.
Audio data processed on OpenAI's servers. By default, audio is not used for training. Review OpenAI's API data handling policy for sensitive voice applications.
Review Vapi's privacy policy. Call audio is processed in real-time on Vapi's infrastructure. Call recordings and transcripts may be stored per configuration. Review implications for call recording consent laws.
- Native audio processing preserves emotional cues and prosody lost in STT-text-TTS pipelines
- Sub-second latency enables natural conversational AI experiences matching human conversation speed
- Same technology powering ChatGPT Advanced Voice Mode provides validated quality benchmark
- Function calling in voice enables voice AI agents that complete tasks rather than only answering questions
- Sub-1-second latency voice pipeline enables natural conversational AI phone experience
- Model-agnostic design allows optimising LLM and TTS provider for specific use case requirements
- $0.05/minute pay-as-you-go with $10 free credit makes evaluation accessible
- Concurrent call scaling handles production voice agent workloads without infrastructure management
- $0.24/min audio output pricing accumulates quickly for high-volume voice applications
- WebSocket architecture requires different implementation approach than standard REST API calls
- Limited to GPT-4o — no model flexibility for latency vs cost trade-offs
- Call recording consent laws vary by jurisdiction — review before deploying in regulatory contexts
- Voice AI user experience is highly sensitive to latency — evaluate in the target deployment environment
- $0.05/minute costs can scale significantly for high-volume outbound calling programmes
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