Claude vs ChatGPT

It depends on the question. Ask both in one chat and see where they split.

mumo is currently available in the US and Canada.mumo is currently available in the US and Canada (outside of Quebec).
Free to start · no account needed

Which answer do people prefer?

GPT-6 Luna is ahead on most things.

Too close to call on hard questions, coding web apps and math.

  • Chat overallGPT-6 Luna Slightly ahead+16 pts
  • Creative writingGPT-6 Luna Ahead+49 pts
  • Long questionsGPT-6 Luna Ahead+27 pts
  • Hard questionsToo close to call
  • Coding web appsToo close to call
  • MathToo close to call

Updated 28 Oct 2026. Head-to-head from Arena (LMArena), CC BY 4.0, updated weekly. Each bar grows toward the model with the higher Arena score. Arena rates each model at the reasoning setting it tested, which can differ from mumo's. See every setting on Arena →

Both free on mumo.

FAQ: Claude or ChatGPT?

It depends on what you ask. Claude is Anthropic’s model and GPT is OpenAI’s. They’re trained differently, and the gap shows up on specific questions, not across the board. The quickest way to find out which is better for yours is to ask both.

Both. Claude Haiku 5.5 and GPT-6 Luna are the models this page seats, and both are free to start on mumo, with no account needed.

Yes. That’s what this page is for: ask Claude and ChatGPT together, in one conversation. You ask once, Claude and GPT both answer, and you see where they agree and where they split. The thread keeps going with both of them in it, so there’s nothing to copy between tabs.

Both are on mumo too. Claude Opus 5.5 is on Premium. GPT-6 Astra is on Premium. This page starts you on the Everyday models, which need no account, and you can change the panel from the chip under the box.

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