Same prompt, same commit, two different diffs: a leaderboard that printed every single trial shows how often "can the agent do this" comes out as "sometimes"
This story is from 2026-09-17. It is preserved in the archive; the latest stories are on the live feed.
Anyone who has sent a coding agent the same request twice on the same commit has two diffs to show for it. I went looking for how big that effect is when someone measures it, and a leaderboard published this month prints every trial. Eight models, ten tasks from private production codebases, eight…
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- 2026-09-17 02:24 · r/PromptEngineering
Same prompt, same commit, two different diffs: a leaderboard that printed every single trial shows how often "can the agent do this" comes out as "sometimes"
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