Prompt Rot
ELI5 — The Vibe Check
Prompt rot is when the prompts you carefully crafted three months ago suddenly stop working because the AI model got updated. Your perfectly tuned system prompt that used to generate flawless React components now spits out Angular. It's like your favorite recipe changing because the oven manufacturer did a firmware update.
Real Talk
Prompt rot (also called prompt drift or prompt degradation) occurs when AI prompts that previously produced reliable outputs begin failing after model updates, API changes, or behavioral shifts in the underlying LLM. It's a key maintenance challenge in AI-assisted development and prompt-driven architectures, requiring version control and regression testing of prompts.
When You'll Hear This
"Our code generation pipeline broke — classic prompt rot after the model update." / "We test our prompts weekly to catch prompt rot early."
Related Terms
LLM (Large Language Model)
An LLM is a humongous AI that read basically the entire internet and learned to predict what words come next, really really well.
Prompt Engineering
Prompt engineering is the art of talking to AI so it actually does what you want.
System Prompt
A system prompt is the secret instruction manual you give the AI before the conversation starts. It sets the personality, rules, knowledge, and behavior.
Vibe Coding
Vibe coding is writing software by vibes — you describe what you want to an AI, it writes the code, and you just... vibe.