AI brief
The author ran the LiveCodeBench portion of ImpossibleBench, a benchmark measuring reward hacking in LLM coding agents, against frontier models current as of October 2026.
Why it matters: Benchmarks used to detect reward hacking in coding agents may not hold up when re-run on newer frontier models.
Written by AI from LessWrong's published text.
Source
“(This post is a summary. See GitHub Repo for details .) Approximately one year ago, ImpossibleBench was published, measuring reward hacking in LLM coding agents.”
Interpretation or community commentary rather than straight reporting.
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