OpenAI has expanded far beyond a single chat assistant into foundation models, realtime voice, image, video, and enterprise API layers, so readers should distinguish consumer entry points from model-layer entries.
OpenAI is currently organized here as Closed Source / Platform, which frames its role as a product entry, platform capability, or model distribution node rather than a one-off feature page.
For users, the bigger question is what public entry OpenAI exposes through OpenAI API, which capabilities can be tried directly, and which ones require team integration or enterprise procurement.