By Quad Chat · Published · Last updated
How to Compare AI Models Side by Side
To compare AI models fairly, send the same complete prompt to two or three models at once, decide what a good answer looks like before you read them, and judge the differences against that checklist. In Quad Chat the comparison is built into the composer: you pick up to three models, send once, and the answers appear next to each other in the same conversation.
Direct answer: Open the Compare control in the Quad composer, choose 1, 2 or 3 models, write one prompt and send it. Read the answers side by side, note where they disagree, verify the claims that matter, then continue with the model or answer you trust. You need a free Quad account, and comparison is not available in incognito chats.
Why compare at all
Public benchmarks describe models in general. They do not tell you which model handles your contracts, your codebase or your tone of voice. Running your own prompt through several models is the quickest way to find out, and the disagreements are the useful part: where two strong models differ, you have found the claim that needs checking.
Comparison is not always worth it. A routine rewrite rarely needs three answers, and each answer is its own generation that uses part of your plan's allowance. Save it for decisions, unfamiliar technical work, high-stakes writing and research summaries.
How comparison works in Quad Chat
- Open Compare. In the composer, open the Compare models control.
- Choose how many. Pick 1, 2 or 3 models. Each numbered slot has its own model selector, so you can mix providers, for example GPT-6, Claude Sonnet 5.5 and Gemini 3.1.
- Send one prompt. The same message, attached files and conversation history go to every selected model.
- Read the answers together. On a desktop-width screen the answers sit in two or three columns. On a phone each answer is a card you swipe between.
- Keep going. Each answer has its own actions, including copy, retry and branching the conversation from that model's reply.
A few details are worth knowing:
- Picking the same model in two slots counts as one model, so you always compare distinct models.
- Which models appear depends on your plan. The model directory shows the lowest plan that opens each one.
- Comparison needs a signed-in account. Guests and incognito chats get a single model, and one-off temporary file analysis, which does not save the file, cannot be combined with comparison.
- The model picker shows a credit estimate, so you can see the cost before you send. Three answers use more of your allowance than one, which the credits guide explains.
- If you would rather not choose, smart routing picks a model for you.
Choose models that differ on purpose
Three near-identical models teach you little. Pick models that differ along a dimension you care about:
| Dimension | Example pairing | What you learn |
|---|---|---|
| Provider | One GPT, one Claude, one Gemini model | Whether the answer depends on a lab's habits |
| Tier | A flagship model next to a lightweight one from the same family | Whether the premium buys anything for this task |
| Cost | A budget model next to a premium model | Where you can safely use the cheaper one |
| Context | A long-context model on a large document | Whether details survive a long input |
The per-token pricing guide shows how wide the cost gap between tiers can be, which is a good reason to test the tier question first.
A repeatable method
1. Write one complete prompt
Include the goal, the audience, the format and any source material. If one model gets more context than another, you are testing your prompt, not the models.
2. Decide your criteria first
Write down three to five things a good answer must do before you read anything. That keeps the first answer you read from setting the standard.
| Task | Criteria worth writing down |
|---|---|
| Decision memo | Assumptions stated, risks named, a clear recommendation |
| Code review | Correct fixes, edge cases, no invented APIs |
| Research summary | Claims tied to sources, uncertainty flagged |
| Marketing draft | Specific claims, on-brand voice, nothing unsupported |
| File analysis | Quotes and numbers match the document |
| Study explanation | Clear steps, correct examples |
3. Read for disagreement, not for a winner
Mark where the answers differ in facts, recommendations or assumptions. Agreement between independent models raises confidence a little. Disagreement tells you where to spend your verification time.
4. Verify what matters
A model can be fluent and wrong. Check important numbers, quotations and citations against primary sources, and ask for sources when you search the web.
5. Decide and record
Pick the answer to use, or ask one model to merge the strongest parts while resolving the disagreements you found. Then note which model suited this task type, so next time you can use it directly instead of comparing again.
Common mistakes
- Changing the prompt between runs. Send once to all models.
- Judging on style alone. Confident prose is not the same as correct content.
- Comparing everything. Comparison has a cost in attention and credits. Use it where uncertainty is expensive.
- Treating one test as proof. One prompt is a data point. Repeat with two or three representative tasks before you change your default model.
Comparing other tools
Side-by-side tools exist outside Quad, and some are built only for comparison. If that is the only feature you need, see how Quad compares with ChatHub. For a walkthrough aimed at three specific model families, read how to compare ChatGPT, Claude and Gemini side by side.
Summary
Comparing models is a decision step. Send one prompt, write your criteria before reading, choose models that differ for a reason, focus on disagreements and verify what matters. Quad puts up to three models in one composer and one conversation, so the comparison and the follow-up work stay together.
Compare behavior in this guide was checked against Quad's current product on October 5, 2026. Features and plan access can change.
See also: Compare ChatGPT, Claude and Gemini side by side | Use ChatGPT and Claude together | All AI app comparisons