The big headlines on this release are efficiency, with OpenAI reporting that GPT-5.4 uses far fewer tokens (47% fewer on some tasks) than its predecessors).

I test-drove both. Here’s what I learned. In early March, OpenAI unleashed a one-two punch, dropping two major frontier models just days apart.

OpenAI's Latest AI Models Are Built for Speed

OpenAI's Fidji Simo focuses on profitability, shutting down Sora AI video app due to compute constraints in favor of ChatGPT's growth.