Compare AI models side by side
Send one prompt to GPT, Claude, and Gemini at the same time. Read their answers next to each other, then merge the strongest parts into a single response.
How it works
- Pick the models you want to hear from.
- Send your prompt once. MultiLens fans it out to every model in parallel.
- Compare the replies side by side, then synthesize one answer that takes the best from each.
Models you can compare
MultiLens connects GPT (OpenAI), Claude (Anthropic), and Gemini (Google), with more available through OpenRouter. You choose which ones answer each prompt, and you can change the lineup mid-conversation.
Why compare instead of trusting one model
No single model is best at everything. One writes cleaner code, another reasons more carefully through a tricky question, a third has fresher information. Seeing the answers together shows where the models agree, which is usually a good sign, and where they diverge, which is worth a second look. You stop guessing which model to ask.
One synthesized answer when you want it
Reading three replies isn't always what you want. MultiLens can synthesize them into a single response, reconciling the differences for you. Quorum mode returns as soon as a majority of the models have answered, so a slow model doesn't hold up the result.
Frequently asked questions
Which AI models can I compare?
GPT from OpenAI, Claude from Anthropic, and Gemini from Google, plus more models through OpenRouter. You can mix them in a single conversation.
How many models can I run at once?
It depends on your plan. The free tier runs several models per prompt, and paid plans raise that limit. See the pricing page for the current numbers.
What does synthesis do?
Synthesis reads every model's reply and merges them into one combined answer, reconciling where they disagree so you don't have to read each response in full.
Is comparing models free?
There's a free tier to get started. Pro and Ultra plans add more models per prompt and higher monthly usage.
Can I compare models on my phone?
Yes. MultiLens runs in the browser and as native iOS and Android apps, with the same side-by-side comparison.