Before a decision that matters — or whenever an AI sounds a little too sure of itself — it pays to ask more than one model. ChatGPT, Claude and Gemini have different strengths and different blind spots, and putting their answers side by side is the fastest way to catch what one of them missed.
Here are three ways to do it, and when each one makes sense.
Questions worth asking more than one AI
You don't need to compare everything. It's worth it when there's no single right answer and coverage matters:
- Reviewing a contract, a proposal or a plan for gaps.
- Technical design choices and their trade-offs.
- Wording options for an important email, pitch or headline.
- Fact checks — when one AI states something confidently, see whether the others agree.
1. The manual way
Copy your question, open each AI in its own tab, paste, send. For two assistants that's fine.
For three or four it gets tedious, and the answers end up scattered across tabs, so reading them against each other takes effort too.
One rule that matters: keep the question word-for-word identical. If the wording changes, you can't tell whether a difference comes from the model or from how you asked.
2. A side-by-side model playground
Sites like LMArena have a side-by-side mode that sends one prompt to two models and shows both replies. It's a good way to get a feel for how models differ.
The trade-off: it's a separate place from your own ChatGPT, Claude or Gemini accounts, so those conversations don't land in your usual history, and you're not using the same settings and context you normally work with.
3. Send once to your own AIs, then read the answers side by side
Qarta, a Chrome extension I build (full disclosure), can send one prompt to several AIs at once: pick the sites, send, and each one opens in its own tab with exactly the same text. Because it uses your normal accounts, every conversation also stays in that AI's own history.
When the answers are in, Qarta's chat library lines them up on one screen, so you can see at a glance which reply is strongest. It works across ChatGPT, Claude, Gemini, Copilot (personal), Perplexity and Grok.
Sending to several AIs at once and the side-by-side view are part of Pro ($10/month). On the free plan, every chat on all six AIs is still saved automatically, and the last 30 days are searchable in one place.
Summary
- Two AIs, once in a while → do it by hand, with an identical question.
- Exploring how models differ → a side-by-side playground.
- Comparing your own AIs regularly → send once and read side by side with a tool like Qarta.
Feedback welcome — I read every message: repech.com/qarta.
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