Is this a world record? The GPT 5.5 ran for 19 hours
OpenAI Developer Community
May 13, 2026
Pimpcat:
> Are you kidding? 5.5 eats tokens as fast as pro does in API and CLI
This is not my lived experience.
Yesterday I ran easily for 30 minutes to an hour straight on a single context window.
729 messages, 43M cached context window at 241k, zero compactions up to that point and so many turn.
I find 5.5 medium incredibly token efficient, much more than 5.4 or 5.3 which would compact far more often.
Discussion in the ATmosphere