OpenAI GPT-Realtime-2: Complete Voice API Developer Guide (2026)

Short summary

OpenAI released GPT-Realtime-2 (May 2026) with GPT-5-class reasoning, enabling complex voice agent workflows with reliable tool chaining, parallel calls, and 128K context windows. Companion models handle live translation across 70+ languages and streaming transcription. Production code patterns and reasoning-effort cost optimization included.

• •GPT-Realtime-2 adds GPT-5-class reasoning with 128K context for complex, long-duration voice sessions without context stitching
• •Parallel tool calling and audible progress signals solve earlier limitations in agentic voice workflows
• •New models for translation and streaming transcription complete the voice pipeline with production-ready code

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