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Developer's experiment reveals 18% AI hallucination rate, builds verification tool

A developer conducted an experiment over a week, logging the accuracy of AI agent outputs. The results showed that nearly 18% of outputs were confidently incorrect, with specific issues including fabricated citations and incorrect tool usage. To address this, the developer built a model-agnostic verification layer that checks outputs for accuracy, code validity, and safety before they reach the codebase, operating in under 100ms. AI

IMPACT Highlights the prevalence of AI hallucinations and offers a practical solution for developers to improve AI agent reliability.

RANK_REASON Developer built a tool to address issues found in AI model outputs.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Developer's experiment reveals 18% AI hallucination rate, builds verification tool

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Jeffrey.Feillp ·

    I Tracked Every AI Hallucination for a Week — The Numbers Were Worse Than I Thought (1790634402396)

    <p>Last week I ran an experiment. Every time my AI agent generated an output, I verified it manually and logged whether it was correct.</p> <p><strong>The results were embarrassing.</strong></p> <p>Out of 200 outputs across Claude, GPT, and DeepSeek:</p> <ul> <li>36 were confiden…