Development

A model solves two open problems, improving on published results

development2026-03-18

Claim

HorizonMath, a benchmark of over a hundred predominantly unsolved problems, found GPT-5.4 Pro has already solved two open problems with novel solutions improving on best-known published results.

Reported metric: 2 open problems

Reporting date: 2026-03-18 (not necessarily the event date)

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Welcome to March 18, 2026 (theinnermostloop.substack.com)

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About

HorizonMath

Reported in

Welcome to March 18, 2026

Actor

OpenAI

Evidence for

Supersedes

Epoch investigates an apparent solution to an open problem

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A model solves two open problems, improving on published results
Innermost Loop KB — secondary record
Reporting date: 2026-03-18
KB permalink: https://nicholsn.github.io/innermost-loop-kb/developments/2026-03-18-two-open-problems-solved-on-horizonmath
Claim: HorizonMath, a benchmark of over a hundred predominantly unsolved problems, found GPT-5.4 Pro has already solved two open problems with novel solutions improving on best-known published results.
Attributed sources:
- Welcome to March 18, 2026 — https://theinnermostloop.substack.com/p/welcome-to-march-18-2026
This citation does not imply independent verification of linked-source claims.

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