LLM as online judge
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⚠️ This post is over one year old. It may no longer be up to date or relevant. Opinions may have changed.
In 2025 it is quite comfortable to use LLMs (GenAI) to grade your code submissions (from LeetCode, HackerRank, etc).
Not only do they give you near-instant feedback (for performance, readability, consistency) and code analysis, but they can also spot mistakes that would otherwise take you precious tens of minutes of time to debug1. ∎
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While it’s important to spend some time debugging the code yourself, there’s a lost opportunity cost when getting stuck, yielding lost time that could have been spent resolving more (diverse, interesting) problems. ↩︎
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