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OpenAI DevDay 2026 is Tuesday, Sept 29, and the leaks are stacking up 👀 Ultrafast mode is a new speed tier for OpenAI's API, sitting above Standard and Fast. OpenAI already previewed it at up to 750 tokens per second for a few customers, and it just showed up in the Playground code. Faster AI means agents that don't make you sit there waiting. Aeon (maybe launching as "o") is a rumored always-on agent. It's supposedly OpenAI's answer to Grok Bot, built to keep working on your tasks in the cloud for hours or even days. Add a possible Codex usage reset and maybe a new model. None of this is official yet, so we find out Tuesday. [your take: the one you actually care about and why] Which one are you most hyped for? OpenAI DevDay, OpenAI DevDay 2026, DevDay leaks, OpenAI Ultrafast, Ultrafast API, OpenAI Aeon, OpenAI o agent, always-on AI agent, Grok Bot competitor, Codex usage reset, Codex limits, GPT-6, OpenAI new model, AI agents, AI news