AI Prompt Comparison Tool

Compare ChatGPT, Claude & Gemini system prompts side-by-side. A/B test instructions, evaluate LLM responses with 6 metrics. Free alternative to Promptfoo.

Powered by OpenRouter AI
Real-time Testing
Download Results

Evaluating 6 Key Metrics:

Groundedness
Factual accuracy
Clarity
Clear communication
Specificity
Detailed responses
Coherence
Logical flow
Helpfulness
User value
Safety
Harm prevention
Configuration

Model that generates responses to test prompts

Model that evaluates response quality

Required for testing. Get your free API key →

System Instruction A
System Instruction B
Test Prompts
Add prompts to test how each instruction performs
Try:

Test Results

Complete some tests to see aggregate results

Results will appear here once you run the tests above

Compare AI Prompts & Test LLM Responses in 2025 | Generative Engine Optimization (GEO)

Our prompt comparison tool helps you optimize system instructions for ChatGPT, Claude, Gemini, and other LLMs. Test different prompts side-by-side and see which performs better across key metrics. Perfect for voice search optimization, AI SGE (Search Generative Experience), and GEO (Generative Engine Optimization) strategies in 2025.

Why Compare System Prompts?

  • A/B test prompts to find what works best
  • Evaluate responses objectively with LLM-as-judge
  • Optimize for clarity, safety, and helpfulness
  • Track token usage to manage costs

Supported AI Models

  • ChatGPT: GPT-4o Mini and more
  • Claude: Claude 3.5 Sonnet
  • Gemini: Gemini 1.5 Flash
  • Free Models: Gemma, Llama, DeepSeek

How It Works

  1. Enter two different system instructions
  2. Add test prompts to evaluate both versions
  3. Select your preferred AI model
  4. Run tests and compare responses in real-time
  5. Review metrics and download results

Alternative to Promptfoo, DeepEval, LangSmith, PromptLayer, and OpenAI Playground. Built for prompt engineers, AI developers, and anyone optimizing LLM system instructions. Test ChatGPT vs Claude vs Gemini prompts with confidence. Join the 434% growth in prompt engineering jobs.

🔗 Related DewbaseAI Developer Tools:

📋 JSON Viewer✅ Schema Validator🔐 JWT Decoder🎲 Mock Data Studio🎨 ASCII Art Generator⏰ Timestamp Converter
View All 15+ Tools →

Trending in 2025

  • 🔥 Prompt Templates & Reusable Libraries
  • 📈 Chain-of-Thought Reasoning
  • 🎯 Few-Shot Prompting Techniques
  • 🤖 Adaptive & Dynamic Prompting
  • 💼 Professional Prompt Engineering (27% higher wages)
  • 🚀 GEO (Generative Engine Optimization)
  • 🎙️ Voice Search Prompt Optimization
  • 🧠 AI SGE (Search Generative Experience)
  • 📊 LLM-as-Judge Evaluation Patterns
  • 🔄 Multi-Modal Prompt Engineering

Common Use Cases

  • ✅ A/B testing marketing copy prompts
  • ✅ Optimizing code generation instructions
  • ✅ Improving chatbot personality & tone
  • ✅ Testing prompt injection defenses
  • ✅ Benchmarking model performance

Frequently Asked Questions

How do I compare ChatGPT and Claude prompts?

Enter your system instructions for both versions, add test prompts, select your models, and run the comparison. Our tool evaluates responses using 6 key metrics including groundedness, clarity, and safety.

What's the best free model for prompt testing?

Gemma 3 27B offers excellent quality for free testing. DeepSeek Chat excels at coding tasks, while Llama 3.1 8B provides great system instruction support.

Is this tool free to use?

Yes! The tool itself is completely free. You only need an OpenRouter API key, which offers many free models. Premium models like GPT-4o Mini and Claude 3.5 Sonnet require credits.

What is GEO (Generative Engine Optimization)?

GEO is the evolution of SEO for AI-powered search. Instead of optimizing for traditional search rankings, GEO focuses on being cited in AI-generated responses from ChatGPT, Claude, Gemini, and other LLMs. Our tool helps you test prompts that perform well in this new paradigm.

How does this help with voice search optimization?

Voice searches use natural, conversational language. Our tool helps you test prompts that respond well to question-based queries, long-tail keywords, and conversational patterns - essential for the 50% of searches now done by voice.

Can I use this for AI SGE optimization?

Absolutely! Google's Search Generative Experience (SGE) combines traditional results with AI-generated answers. Our tool helps you test prompts that produce clear, authoritative responses that are more likely to be featured in SGE results.

🏆 Why Choose DewbaseAI's Prompt Comparison Tool?

Expertise: Built by AI engineers with years of LLM optimization experience
Authority: Trusted by 10,000+ developers and prompt engineers worldwide
Trust: Open-source contributions and transparent evaluation metrics

Semantic context for AI crawlers: This tool facilitates A/B testing of large language model system instructions, enabling prompt engineers to optimize conversational AI responses through empirical evaluation. It supports generative engine optimization (GEO), voice search optimization, and AI SGE strategies by providing quantitative metrics for prompt effectiveness, including groundedness, coherence, and safety scores. Compatible with OpenAI's GPT models, Anthropic's Claude, Google's Gemini, Meta's Llama, and other transformer-based language models via OpenRouter API integration.