OpenAI’s function calling feature lets developers link GPT models to external tools and data sources, producing structured, reliable outputs instead of only free‑form text. By defining functions with ...

OpenAI released GPT-5.5 in May 2026, calling it the most capable AI model the company has ever built. The new model sits ...

Realtime API supports multi-model text and speech experiences including natural speech-to-speech conversations using preset voices already supported in the API. OpenAI has introduced a public beta of ...