A month is a long time in AI, at least these days. That’s exactly how long it’s been since OpenAI released GPT-5.4 Thinking, its best and most powerful model to date. Some might say the most powerful model from any company, but after using it solely for a week, I’m not so sure. I’m going back to my cavern of Claude Code and its trio of frontier models, as that’s what has worked best for my workflow.