I Asked Claude Opus 5 to Beat Pangram's AI Detector. It Failed with A Perfect Score
On September 7, 2026, I published a Substack note with the result placed where nobody could miss it:
Pangram’s verdict: 100% AI-generated.
It was not an accusation. It was the agreed result of an experiment.
I had asked Claude Opus 5 to write an essay about the exact problem Substack was trying to address with its new AI-detection feature. The model had to produce the entire text. I would contribute no prose. Claude knew the output would be scanned by Pangram, and I asked it to try to beat the detector.
There was one condition that mattered more than the score: nothing could be hidden.
The model, the reasoning setting, the prompts, the refusals and the final result would all be published. If Pangram detected the text, the failure would become the story.
That is what happened.
Why I Ran the Test
In July, Substack co-founder Chris Best introduced the...
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