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Introducing ContributionBench - Codeforces


DNR's blog

Introducing ContributionBench
By DNR, 7 days ago, In English

AI labs once treated codeforces problems as a benchmark to hill-climb. They have clearly succeeded at this goal, and achieved superhuman performance for pennies. However, we all know that there's one thing much more important than rating on CF. Conspicuously, it just so happens to be the case that AI is much worse than humans at this one thing. What is this "one thing", you ask? Farming contribution, of course.

Recent events (or should I say "Recent actions"?) unfortunately suggest that AI might be developing moderate competence in this once human-dominated field too. This blog has received 172 upvotes, something unheard of for AI-authored content.

As a foremost expert in this field, I'm introducing ContributionBench, a benchmark that aims to measure AI progress in contribution-farming.

The methodology is simple and robust:

  1. A blog is eligible for the benchmark if and only if pangram detects >95% of it to be AI-generated, and it contains no embedded images/videos.
  2. A blog's CCI (Contribution Capability Index) is equal to $$$\dfrac{v + c/5}{\sqrt[3]{L}}$$$, where $$$v$$$ is the number of upvotes, $$$c$$$ is the number of comments, and $$$L$$$ is the number of characters in the title + body.

Leaderboard

Last update: 29/10/2026

Human Baseline: 108.6 (DNR, Blog 133908)

🥇 69.6: Unknown (Blog 157657)

🥈 4.75: Anthropic (Claude Opus 5.5, Blog 158241)
🥉 ??


Full Results

Want a blog to be added to ContributionBench's official results? Mention it in the comments below!

  • Vote: I like it
  • +52
  • Vote: I do not like it

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7 days ago, hide # |
 
Vote: I like it 0 Vote: I do not like it

https://codeforces.com/blog/entry/149257 143.58

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    7 days ago, hide # ^ |
     
    Vote: I like it 0 Vote: I do not like it

    Also I think the reason why the other blog got that much upvotes is because it's a funny, creative human made idea, unlike AI generated blogs by a certain color of usernames

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      6 days ago, hide # ^ |
       
      Vote: I like it 0 Vote: I do not like it

      take a look at the new leader :skull:

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6 days ago, hide # |
← Rev. 3  
Vote: I like it +1 Vote: I do not like it

this Ai-written blog have 750+ upvotes sadly due to the sheer size of the blog it gets a mere 69.3

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6 days ago, hide # |
← Rev. 2  
Vote: I like it 0 Vote: I do not like it

https://codeforces.com/blog/entry/155674 This stupid blog complaining about AI users which is obviously AI written and has +91 gets, nearly 8 points(Please go and downvote).

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    6 days ago, hide # ^ |
     
    Vote: I like it 0 Vote: I do not like it

    We get it bro it's bad but you don't have to start a riot because of it

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      6 days ago, hide # ^ |
       
      Vote: I like it 0 Vote: I do not like it

      Not a riot just when you click the link also click downvote button

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        6 days ago, hide # ^ |
         
        Vote: I like it 0 Vote: I do not like it
        1. Downvoting doesn't do anything
        2. It basically is a riot with the amount of hate you're dropping on this 3 month old blog. One comment and a downvote is enough to prove that you hate the blog
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          6 days ago, hide # ^ |
           
          Vote: I like it 0 Vote: I do not like it

          Well this bro has +41 Contribution with only typing "GPT write me some emotional blog" and i think this is not fair.

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            6 days ago, hide # ^ |
            ← Rev. 3  
            Vote: I like it 0 Vote: I do not like it

            Accept it then, the blog is too old to still have controversy going on about it anyways

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6 days ago, hide # |
 
Vote: I like it 0 Vote: I do not like it

https://codeforces.com/blog/entry/156327 gets about 170.7

I really like that contest announcement, but pangram detects 100% of it to be AI generated and it contains text only, so it seems eligible. Though, it's not surprising that a contest announcement has many upvotes + many comments (especially when it has a creative format).

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6 days ago, hide # |
 
Vote: I like it +8 Vote: I do not like it

Imagine if the first blog had $$$180.92946273311546$$$ more characters?..

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