Nov 26, 2025 · 2 min read · Usage Test different versions of system prompts, or entirely different system prompts at the same time! Test different LLMs, or different temperatures at the same time! Prerequisites Install Promptfoo https://www.promptfoo.dev/docs/installatio...
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May 26, 2025 · 4 min read · Ever wonder how Large Language Models (LLMs) like ChatGPT actually "read" and "write"? It's not in words, but in something called tokens. Understanding tokens is crucial for anyone using or building with LLMs – it directly impacts performance, cost, ...
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May 26, 2025 · 4 min read · If you're looking to master prompt engineering, AI model behavior, and build testable, production-grade prompts, this is your field guide. This guide walks through everything from basic prompting anatomy to evaluations (Evals) and parameter tuning. ...
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Feb 15, 2024 · 7 min read · "Untested software is broken software." As developers writing code for production environments, we deeply embrace this principle, and it holds particularly true in the context of working with large language models (LLMs). In order to develop robust a...
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