OpenAI

Catch ChatGPT and GPT-5 announcements the moment they drop

OpenAI's official channel carries model launches, DevDay keynotes, and researcher interviews. Engineers watch in real time — the demand is immediate post-stream summarization.

Once YouTube finalises captions (usually ~10 minutes after the stream ends), SumTube can summarize. Skim the recap first, watch only the part you care about.