# GPT-5.6 Sol Ultra proves 50-year-old math conjecture in under an hour

> A machine reportedly cracked a problem that stumped humans for nearly half a century. OpenAI says its GPT-5.6 Sol Ultra generated a machine-verified proof of the Cycle Double Cover Conjecture, an open question in graph theory since 1979, and did it in under an hour by fanning the work out across 64 subagents running at once. The proof draws on the 8-flow theorem and linear algebra over GF(3), a small finite field, to build its argument. What makes this notable is less the single result than the method. Rather than one model grinding on a hard problem, dozens of copies explored different lines in parallel and stitched together something a formal checker could verify, a template that could generalize to other unsolved questions. The usual caution applies. The proof is still under review because of its length and importance, and extraordinary claims in mathematics earn their status only after human experts sign off. If it holds, it is an early sign that frontier models are becoming genuine research collaborators rather than just fast calculators.

_Section: [Daily AI Updates](https://www.wortins.com/daily-ai) · Source: Crypto Briefing · Published Sunday, July 12, 2026_

## Wortins' read

A machine reportedly cracked a problem that stumped humans for nearly half a century. OpenAI says its GPT-5.6 Sol Ultra generated a machine-verified proof of the Cycle Double Cover Conjecture, an open question in graph theory since 1979, and did it in under an hour by fanning the work out across 64 subagents running at once. The proof draws on the 8-flow theorem and linear algebra over GF(3), a small finite field, to build its argument. What makes this notable is less the single result than the method. Rather than one model grinding on a hard problem, dozens of copies explored different lines in parallel and stitched together something a formal checker could verify, a template that could generalize to other unsolved questions. The usual caution applies. The proof is still under review because of its length and importance, and extraordinary claims in mathematics earn their status only after human experts sign off. If it holds, it is an early sign that frontier models are becoming genuine research collaborators rather than just fast calculators.

## Source

[Read the full story at Crypto Briefing](https://cryptobriefing.com/openai-gpt-5-6-sol-ultra-math-proof/)

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