AI Solves the Hadamard Matrix of Order 668 Problem
deedydas · x · 2026-08-13
Epoch AI reports that the previously unsolved mathematical problem of the Hadamard matrix of order 668 has been cracked. The solution was submitted by an Anthropic researcher leading a team of three humans and Claude, providing constructions for all previously unknown admissible orders up to 2000.
Epoch AI has provisionally marked the problem as solved by AI, though it remains unclear how significantly humans contributed to the core mathematical ideas. It is also unconfirmed whether the result stems from a fully general construction or an improved search strategy, meaning the broader Hadamard conjecture remains unresolved.
Related event: Claude Solves 668-Dimension Hadamard Matrix Problem(4 posts)→
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