REDDIT · REDDIT// 32d agoBENCHMARK RESULT

GPT-5.4 pro sparks Euler 949 debate

A Reddit post claims GPT-5.4 pro solved Project Euler 949, a 100%-difficulty game-theory problem that MathArena recently listed among the last unsolved Project Euler problems for top LLM agents. The shared ChatGPT trace shows extended reasoning and code exploration, but because the exact answer is already publicly posted online, this is notable evidence of progress rather than clean proof of uncontaminated reasoning.

// ANALYSIS

Impressive trace, shaky proof: this looks like a real jump in hard-problem performance, but not a benchmark-quality demonstration on its own.

–The public ChatGPT share shows a long exploratory workflow with multiple failed approaches, code experiments, and a derived final answer rather than a single lucky guess
–MathArena's Agentic Euler analysis said no tested model had solved Problem 949, so a credible solve here would matter for frontier reasoning claims
–The exact answer, 726010935, already appears in public Project Euler solution dumps, which means memorization or contamination cannot be ruled out
–The strongest version of this story is not "GPT definitively solved an unsolved human-hard problem from scratch," but "GPT-5.4 pro produced a plausibly reasoned solution on a notoriously hard task"
–What developers should watch next is controlled replication: same prompt, fresh sessions, no web access, and independent answer verification

// TAGS

gpt-5.4-proopenaillmreasoningbenchmark

DISCOVERED

32d ago

2026-03-10

PUBLISHED

32d ago

2026-03-10

RELEVANCE

8/ 10

AUTHOR

Purefact0r