Internal Codex version found the same counterexample in a proof attempt
aaron_lou · x · 2026-07-21
A thread sharing a writeup from an internal version of Codex says the model found essentially the same counterexample that Levent discovered, even without web search.
The post frames this as a useful internal proof attempt: the model produced a clean summary of the strategy, and the author highlights the result as a noteworthy capability signal for Codex-style systems.
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