OpenAI API Key
Your key is stored only in your browser and is never sent anywhere except directly to OpenAI's API.
API Key
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platform.openai.com
. The evaluator uses GPT-5.4 Mini for judging (very cheap — typically under $0.01 per eval run).
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Litmiq prompt evaluator — compare OpenAI models side by side
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Litmiq
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System Prompt
Models to Test
Scoring Criteria
Test Cases
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Configure your system prompt, choose models, add test cases, and hit Run Evals. Results appear here with per-metric scores.