While you can't easily set ChatGPT Search as a default search engine in most browsers (which you maybe shouldn't do, anyway), you can still create shortcuts to quickly and easily search anything ...

ChatGPT 4o mini was handling the search. You can't currently set ChatGPT Search as your default search engine on mobile. You can use ChatGPT Search inside the mobile app if you need to.

Replace Google With ChatGPT Search In Chrome OpenAI makes it easy to replace Google as the default search engine in Chrome, because it’s released a browser extension that does just that.

But you can also set ChatGPT as the default search engine in your browser, so you receive ChatGPT's response to your query instead of Google search results.

Click Manage search engines, find your preferred engine, click the three dots, and choose Make default. If it’s missing, add it manually using the correct search URL.