GPT-5.4 seems like an improvement in general intelligence. Most benchmarks are not really that important to me anymore, but this model has a beautiful mind. It sees further. Also, a noticeable improvement in prose, it is much better at turning a phrase conversationally. If you want to test its growth, go back to any previous session where you felt like you were working at a high level, use the 'branch in new chat' button, and ask 5.4 to take a look. It will usually see a little further along…