Live, side by side
All models write their answers at the same time, so you can compare while they stream in.
One prompt. Every leading AI model.
AI Model Compare sends your prompt to Claude, GPT, Grok, Kimi, GLM and more at the same time, then shows every answer side by side, with a live word count, the response time and the cost of each one.
Available to SerpCaptain clients in the client area.
Why it helps
Stop guessing which AI writes best
Every model has its own voice, length and speed. Put them next to each other on the same brief and the right choice becomes obvious.
A word count for every answer
See at a glance which model keeps it short and which one runs long, with a chart of every answer’s length.
Speed and cost per model
Response time, tokens and cost are shown for every answer, so you can weigh quality against price.
Any combination of models
Compare two models or all of them at once. Your selection is remembered for next time.
Control when you need it
Add a system prompt, choose the reasoning effort or cap the answer length for more precise tests.
Save, share and export
Every comparison is saved to your history. Share one with your team through a private link, or download it as Markdown.
Models
The latest models, ready to compare
The line-up is kept up to date as new models are released.
Anthropic
- Claude Opus 5.5
- Claude Opus 5
- Claude Opus 4.8
- Claude Opus 4.7
- Claude Opus 4.6
- Claude Fable 5.1
- Claude Fable 5
OpenAI
- GPT-6 Astra
- GPT-6 Astra Pro
- GPT-4.1
xAI
- Grok 4.7
Moonshot AI
- Kimi K3
Z.ai
- GLM 5.3
How it works
Three steps to a better answer
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1
Log in to the client area
Open AI Model Compare with your SerpCaptain client account.
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2
Write a prompt, pick the models
Any brief works: a meta description, a product text, an outline or a question.
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3
Compare and choose
Read the answers side by side, check words, speed and cost, and copy the best one.
Ideas
Made for everyday SEO work
Meta titles and descriptions
Blog outlines and headings
Product and category texts
FAQ answers
Content briefs
Rewrites and translations
FAQ
Questions and answers
Who can use AI Model Compare?
It is part of the SerpCaptain client area. Log in with your client account to use it.
Do I need my own AI or OpenRouter account?
No. The models are already connected, so you can start comparing straight away.
Are my comparisons saved?
Yes. Every comparison is saved to your private history in the client area, so you can open it again later. Only you can see it, unless you share a link, and you can delete it at any time. Prompts are sent to the AI providers only to generate the answers.
Can I share a comparison with my team?
Yes. Create a share link for any comparison and send it to your co-workers. They can see the prompt and every answer without an account. You can turn the link off at any time.
Is there a limit?
A fair-use limit keeps the tool fast for everyone: up to 25 comparisons per day. The tool shows how many you have left.
Which models are included?
Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Fable 5.1, Claude Fable 5, GPT-6 Astra, GPT-6 Astra Pro, GPT-4.1, Grok 4.7, Kimi K3, GLM 5.3.
Ready to find your best AI model?
Log in to your SerpCaptain client area and run your first comparison.
Log in to use it