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(4.5)
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PromptFoo is a prompt testing and evaluation framework built for developers working with large language models like OpenAI, Claude, Cohere, or local LLMs. It allows users to define test cases in YAML, run batch evaluations, compare outputs across models, and score results using metrics like latency, cost, token usage, and semantic relevance. Available via both CLI and browser UI, PromptFoo brings software engineering practices like testing, versioning, and regression checks into prompt workflows�making it essential for teams shipping AI-powered apps.
Yes, PromptFoo is fully free and open source. You can self-host it or run it locally via CLI or browser-based UI. There are no paid tiers at the time of writing.
No, it’s designed for developers familiar with CLI tools, YAML, and LLM pipelines.
PromptFoo supports OpenAI, Anthropic’s Claude, Cohere, Azure OpenAI, and local LLMs via API.
Yes, its CLI and YAML config make it ideal for test automation and model evaluation in dev environments.
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