Test Multiple AI ModelsSide-by-Side
Stop wasting hours manually testing AI models. Compare GPT-4, Claude, Gemini, and 342+ models simultaneously with live previews, cost tracking, and instant results.
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Everything You Need to Find the Perfect AI Model
Built for developers, content creators, and AI enthusiasts
Parallel Testing
Test unlimited models simultaneously. No more copy-paste between different interfaces.
Live Previews
Preview outputs in Raw, Markdown, HTML, or JSON format. See exactly what you'll get.
Cost Tracking
Track token usage and costs per model. Make informed decisions based on your budget.
Side-by-Side Comparison
Compare outputs from multiple models in a clean, organized interface.
Test History
Save your test results with full history. Revisit and compare past runs anytime.
No Sign-up Required
Just bring your OpenRouter API key and start testing. No account required.
Perfect For Every Use Case
From content creation to code generation
Developers
Compare code completion models, find the best for debugging, or test API integrations before committing.
- Test GPT-4 vs Claude for code generation
- Compare costs for production API calls
- Validate JSON responses before integration
Content Creators
Find the perfect model for blog posts, social media, or marketing copy by testing multiple options.
- Compare writing styles across models
- Preview markdown content before publishing
- Test SEO meta descriptions at scale
Researchers
Evaluate model performance, compare reasoning capabilities, and document your findings.
- Test reasoning across multiple models
- Save and compare historical results
- Export data for analysis
SEO Specialists
Test AI models for content optimization, meta descriptions, and keyword-rich articles.
- Compare SEO-optimized content quality
- Test meta descriptions for CTR
- Find best models for long-form content
Start Testing in 3 Simple Steps
Add Your OpenRouter API Key
Get your free API key from OpenRouter.ai and paste it in the tool. It's stored securely in your browser.
Select Your Models & Enter Prompt
Choose any models you want to test (GPT-4, Claude, Gemini, etc.) and enter your prompt. Enable JSON mode if needed.
Compare Results Instantly
View all responses side-by-side with costs, preview in different formats, and copy the best results.
Frequently Asked Questions
Do I need to create an account?
No! Just bring your OpenRouter API key and start testing immediately. Everything is stored in your browser.
How much does it cost?
The tool is completely free. You only pay for the API calls to OpenRouter based on their pricing. We show you the exact cost for each test.
Which AI models can I test?
Any model available on OpenRouter! Including GPT-4, GPT-4 Turbo, Claude 3 (Opus, Sonnet, Haiku), Gemini Pro, Llama 3, Mixtral, and 100+ more.
Can I save my test results?
Yes! All your test history is automatically saved in your browser. You can view past tests, compare them, and clear history anytime.
Is my API key secure?
Yes! Your API key is stored only in your browser's localStorage and never sent to our servers. All API calls go directly from your browser to OpenRouter.
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