I was about to "correct" you but then read the username - has the best model for agentic coding/sysadmin not just been Claude every single day since Opus 4.5 released last November?
I don't personally see cost as an issue, since I'm using it for a small business with a subsidised consumer subscription (subscription cost is negligible compared to efficiency returns from the last 6 months), but I have found myself going to GPT over Claude for specific niche tasks - namely visual web design and SVG graphics. It does a good job of more things than just pelicans - its N64 controllers are good too!