Is ChatGPT or Claude better?
Neither ChatGPT nor Claude is reliably better across the board. They trade the lead depending on the task, and more importantly, they fail in different ways. For casual use, pick whichever you like. For anything that matters, the question is the wrong one: the reliable move is not to crown a winner but to use both, ask them the same thing independently, and see where they agree and where they diverge. Their differences are the useful part, because a blind spot in one is often caught by the other.
Why there is no permanent winner
Both models are excellent and both are updated constantly, so any ranking is stale within months. On a given day one may write better, the other may reason better, and on your specific question either could be the one that hallucinates. Judging them by their confident tone tells you nothing, because they both sound certain whether they are right or wrong.
The better question
Instead of "which is better," ask "how do I know this answer is right." For low stakes, one model, either one, is fine. For anything with a cost, use both. Ask them the identical question in separate chats, then look at where they line up and where they split. Agreement on the same evidence is a good sign. A fork between them marks the exact claim that needs a source or your judgment. This is how to compare their answers properly.
Use the difference, do not pick a side
Two strong models that fail differently are more valuable together than either is alone. That is the whole premise of the Council Method: you do not need the single best model, you need more than one and the discipline to make them check each other.
The full method is in Let the AI Be Smart.
Go deeper: this site's hub page on the Council Method is the full definition. Related questions: How do I compare answers from ChatGPT, Claude, Gemini, and Grok?, Should I use more than one AI model?, What is the Council Method?.