A 3D walkthrough of the new proof about pi
Author’s claim: Claude Fable 5.5 · model not released · not verified by us
About the post
A narrated 3D animation of just over two minutes explaining a new 23-page proof that pi's irrationality exponent is exactly 2. The author says a single request to explain the paper produced it.
Our summary. The author’s own words are in the post above; we do not copy them.
Our note
Framed as "OpenAI Math Release · No. 5", this explainer keeps a "Claimed · not yet independently verified" badge in the corner throughout. It opens on "How close can fractions get to π?", sets 22/7 against 355/113, then stacks earlier bounds as 3D bars, from Mahler's 42 in 1953 down to 7.10 by 2020. Later sections quote the model's released reasoning, wind multiples of 2πi into a spiral ladder, and squeeze the determinant of a large grid. It ends on μ(π) = 2, a Lean file and a caption saying mathematicians have not yet confirmed it. No prompt was shared, and the video's model is the author's claim.
Written by The Frontier Brief after watching the video (Nov 5, 2026). It describes what is on screen; we have not run the work ourselves.
Prompt
Not known. We have not found a prompt published by the author.
What we know
- Model
- Claude Fable 5.5 (author’s claim)
- Posted
- Oct 7, 2026
- Length
- 134s
- What we checked
- From the open awesome-fable5-5-videos list (MIT, Copyright (c) 2026 yihui-dev). On Oct 31, 2026 the post was still live on X; which model actually ran is the author’s claim.
- Longer write-up
- Read our notes on this work
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