I'd suggest that the GPT-4 models are reaching their peak, and that OpenAI is pushing into the o1 reasoning in an attempt to differentiate and regain the mindshare they're losing.
Claude is regarded as better at many things, Gemini at some others, Gemini has massive context windows, Flash runs faster and cheaper, Bedrock runs cheaper, Gemma and Llama are open source and doing pretty well for many use-cases.
If it weren't for mindshare, I'm not sure OpenAI's models would be thought of as anything special at this point. Now it does sound like o1 is a step up, but it also takes a long time and costs a lot, making it quite niche. It's not something you drop in and get better results from.