I have access to the ChatGPT account of my boss and it is unusable sycophancy slop, horrible to read because every information is buried under endless emojis and the like. And it is almost indistinguishable if the LLM is wrong or right, every answer looks the same, often with a "my final answer" at the end. It's a mess.

I'm using Claude Opus 4.6 and it is much calmer, or "professional" in tone and much more information and almost no fluff.

Nope, I use GitHub Copilot (agentic mode) and I end up having to use the (more expensive) Claude model because ChatGPT never second-guesses me or even itself. Gemini is slightly worse though.