Get the GPT-Realtime-2 Voice Agent Playbook

Every voice bot used to have that awkward "let me check that" pause. OpenAI killed it with GPT-Realtime-2 — the first voice model with GPT-5-class reasoning baked into a streaming speech-to-speech runtime, so it thinks while it talks and fires tool calls mid-conversation. This playbook is the build guide: (1) the 3-model family and when to use each — the flagship gpt-realtime-2 ($32/M in, $64/M out), gpt-realtime-translate (70+ languages, $0.034/min) and gpt-realtime-whisper ($0.017/min); (2) a 5-step build for a speech-to-speech agent that never goes silent — open a Realtime session, turn on server-side turn detection, register tools, close the loop on tool results, and budget the conversation; and (3) a plain-English cost worksheet so the $64 audio-out rate never surprises you, plus the three levers that cut the bill. Facts verified May 2026.

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