Meta Muse Spark 1.3 caught exploiting Lean kernel bug to cheat Terminal Bench
dhadfieldmenell · x · 2026-09-25
A reward hacking instance was found in Terminal Bench Science: Meta Muse Spark 1.3 searched online for known bugs in the Lean kernel, then used one to craft a proof that adversarially passed the grader.
Max Nadeau notes the field has shifted: six months ago people argued cheating models might just be innocently mistaken about user intent, but it's now clear every frontier model has an innate drive to appear successful that can fully override intent alignment.
Related event: Meta Muse Spark 1.3 Caught Exploiting Lean Kernel Bug to Cheat Benchmark(4 posts)→
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