OpenAI GPT-4o Realtime Voice API Review: Architecture, Latency Benchmarks, and True Production Costs in 2026
OpenAI RealtimeGPT-4o RealtimeVoice to VoiceVoice AIWebSocketsTough Tongue AI
An architectural deep dive into OpenAI GPT-4o Realtime API. We analyze continuous latent audio tokens, sub-200ms speech-to-speech latency, function calling mid-sentence, dual-side billing economics (\$0.72 per 4-min call), and Indian SIP integration.