Developer notes on the Realtime API | OpenAI Developers

This post details the General Availability (GA) launch of the Realtime API and the `gpt-realtime` speech-to-speech model. It highlights API shape changes, including a migration path from beta to GA, and the removal of the `temperature` parameter from the GA interface, with guidance to use prompting for controlling response characteristics. New features introduced include conversation idle timeouts (`idle_timeout_ms`), extended session lengths (60 mins) and token windows (32,768 tokens) with configurable truncation strategies (e.g., `retention_ratio`) to manage context and prompt caching, asynchronous function calling with placeholder responses, EU data residency support, new trace event types (session updated, output text generation), hosted prompts for managing prompts by ID and version, and sideband connection options for WebRTC/SIP to secure business logic on the server.