Spreading misinformation by trusting ChatGPT

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A long read of using ChatGPT for research, which has wrong information, and then publishing it in a blog which further cements the information even though it links only to ChatGPT output.

The author David Barry attempts to verify where the info came from and mostly debunks it. M

Subtitled, “A case study in o3 hallucination”.

Misinformation on Marginal Revolution

The piece ends by using the GPT-5 to debunk the previous work:

If you’ve seen the recent claim pinning this on Berthold, it appears to trace to a July 31, 2025 blog post that (unhelpfully) linked to ChatGPT as its “source,” not to any primary document. Treat that as a rumor.

David Barry concludes: “It remains bad practice to cite ChatGPT without verifying its output.”