I think a lot of us are making one small mistake with AI.
We find one tool we like, maybe ChatGPT or Claude, and then slowly start using it for everything. Writing, research, coding, planning, files, images, business work, random questions. Everything goes into the same box.
That worked when these were mostly chatbots.
It does not work nearly as well anymore.
September alone gave us GPT-6 Astra, Claude Opus 5.5, Claude Sonnet 5.5, and GPT-6.1 Sol. These models can search, use tools, work through huge amounts of context, write code, handle files, and stay on a job much longer than the AI we were using even a year ago.
The funny part is that as Claude and ChatGPT become more powerful, I find myself using them more differently, not less.
And once this difference clicks, choosing between them becomes much easier.
One simple rule changed this for me
Here is the easiest way I can explain it.
I use Claude when I want to go deeper into one piece of work.
Give it a long document, a serious writing brief, a messy problem, a big codebase, a pile of research, or something that needs ten instructions to stay together. Claude is very good at staying inside that job.
I use ChatGPT when the work starts moving in different directions.
Research something. Search the web. Read a file. Make a table. Create an image. Turn it into a presentation. Use an app. Work in a browser. Move into Codex. Come back and explain the result.
That is where ChatGPT feels incredibly useful.
So my rule is:
Claude goes deeper. ChatGPT goes wider.
Not every time. Not for every person.
But if someone asked me today which one to open before starting a task, this is where I would begin.
And the useful part is learning how to set them up for those jobs.
Below, you’ll find exactly when to use Claude, when to use ChatGPT, and how to get the best from both.
Do not start with the biggest model
This is the first thing I would change.
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