OpenAI's new Astra model solves 10 unsolved mathematics problems
OpenAI's forthcoming model, Astra, has solved 10 open mathematical problems and published machine-verifiable proofs in Lean 4 without unverified steps.

What happened?
OpenAI has announced that an internal version of its upcoming Astra model family has solved 10 long-standing open problems in mathematics and theoretical computer science. The solutions include machine-verifiable proofs in the formal language Lean 4, published on GitHub with zero unverified steps. Among its achievements, the model constructed a non-sofic group, a question that had remained unsolved since 1999.
Key facts
| Lösta öppna problem | 10 stycken |
|---|---|
| Sidor i publicerat manuskript | 249 sidor |
| Formellt bevis-språk | Lean 4 |
| Öppen licens för kod | Apache 2.0 |
Why it matters
This marks a significant breakthrough for AI in theoretical science, as the model did not merely generate theoretical hypotheses but provided complete, machine-checked proofs. By utilizing Lean 4, the mathematical community can immediately verify the accuracy of the solutions, reducing the risk of so-called hallucinations in advanced reasoning.
Who is affected?
The news primarily concerns researchers in mathematics and theoretical computer science, developers of AI models for automated reasoning, and stakeholders in higher education. For general users, this demonstrates a major leap in the ability of AI models to perform advanced logic.
Impact on the EU
The solutions and the underlying code are freely available to researchers and developers within the EU via GitHub. As Astra remains an internal model, it remains to be seen how OpenAI will manage accessibility and compliance with the EU AI Act when the model family is launched commercially.
What else you should know
The results were published alongside a 249-page manuscript. In addition to known mathematical problems, the model also succeeded in disproving Connes' rigidity conjecture by constructing an infinite number of non-isomorphic groups with property (T) that share the same von Neumann algebra.
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