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Developer finds 18% of AI outputs are confidently wrong

A developer conducted an experiment tracking AI hallucinations over a week, finding that nearly 18% of outputs from models like Claude, GPT, and DeepSeek were confidently incorrect. The study revealed that LLMs prioritize sounding convincing over factual accuracy, leading to fabricated citations and flawed tool usage. To combat this, the developer created a free, model-agnostic verification layer that checks outputs for accuracy, syntax, and prompt leaks before they reach the codebase. AI

IMPACT Highlights the persistent issue of AI hallucinations, underscoring the need for verification layers in AI agent development.

RANK_REASON This is a personal experiment and tool release, not a major industry event or frontier model release. [lever_c_demoted from research: ic=1 ai=1.0]

Read on dev.to — LLM tag →

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

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 (1779876020708)

    <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…