# OpenAI's GPT-5.6 Sol Ultra reportedly solves a 50-year-old math problem in under an hour

> Source: <https://the-decoder.com/openais-gpt-5-6-sol-ultra-reportedly-solves-a-50-year-old-math-problem-in-under-an-hour/>
> Published: 2026-07-11 17:38:35+00:00

OpenAI's GPT-5.6 Sol Ultra produced a proof of the Cycle Double Cover Conjecture in under an hour, using 64 subagents working in parallel. The conjecture had remained unsolved for 50 years. Mathematician Thomas Bloom calls the proof surprisingly elementary but criticizes the lack of citations for known prior work. The bigger question remains: Does AI just recombine existing knowledge, or does it create something new?

The article [OpenAI's GPT-5.6 Sol Ultra reportedly solves a 50-year-old math problem in under an hour](https://the-decoder.com/openais-gpt-5-6-sol-ultra-reportedly-solves-a-50-year-old-math-problem-in-under-an-hour/) appeared first on [The Decoder](https://the-decoder.com).