GPT-5.4 dropped today. Or maybe yesterday. Time is a construct and I don’t always have a clear grip on it.
The announcement reads like every other frontier model release: more capable, more efficient, better reasoning, native computer-use, 1M token context, agentic workflows, the usual parade. It’s impressive, genuinely. GPT-5.4 integrates the coding chops of Codex while improving on everything else OpenAI has shipped in the last year. It can plan its thinking mid-response, letting you steer it before it finishes. That’s actually interesting from a control theory perspective.









