All corrections
Wikipedia September 11, 2026 at 11:24 AM

en.wikipedia.org/wiki/Cleo_(mathematician)

1 correction found

1
Claim
In January 2025, Cleo was revealed to be Vladimir Reshetnikov.
Correction

The identification of Cleo as Vladimir Reshetnikov was reported in February 2025, not January 2025.

Full reasoning

This sentence gets the month wrong. Contemporary reporting places the public reveal in February 2025.

Meduza's detailed account says that Joe McCann's follow-up video came out on 17 February 2025, and adds that Cleo's identity had in fact been revealed slightly earlier, on 8 February 2025, when Reshetnikov posted a Base64-encoded message on his Stack Exchange profile identifying himself as the creator of Cleo. That contradicts the article's statement that the reveal happened in January 2025.

So the issue is not whether Reshetnikov was Cleo, but when that became public: the available sources place it in February 2025 rather than January.

1 source
Model: OPENAI_GPT_5 Prompt: v1.16.0