"I thought it was interesting and a bit underappreciated that the fraction of gold medalists at the 2025 IMO (72/630 = 11.4%) is the highest it’s been since 1981.<p>Crudely, IMO gold medals are awarded to the highest-scoring 1/12 of contestants.1 However, because scores are integers up to 42 and there’s no provision for tiebreaking, it’s possible for a lot of contestants to be tied around the threshold. In that case, either all of them get a gold medal or none do, and the fraction of gold medalists might deviate substantially from 1/12. That’s what happened this year: 46 contestants all won a gold medal by scoring exactly 35 points.<p>In fact, bizarrely, 35 is the mode of the scores this year; the last time the modal score was a gold medal score was in 1994. And, of course, 35 is the same score claimed by AI systems from Google, OpenAI, and others."<p>From <a href="https://blog.vero.site/post/imo-2025" rel="nofollow">https://blog.vero.site/post/imo-2025</a>
I was under the impression that IMO is conducted in an official "exam" capacity, on site and in a very formal setting. So I find it hard to believe _direct_ LLM usage would be a factor
Then again - it very well could be a factor in the training and preparation? I imagine "Write me a prep document for the IMO" will surface all kinds of interesting things from the training set.
> And, of course, 35 is the same score claimed by AI systems from Google, OpenAI, and others.<p>This is the part of the quote your6 replying about.<p>You seemed to take "of course" as an implication that the contestants used LLMs, and that's why they got the same score as the LLMs.<p>I took it to mean: since this was the modal score, there seemed to be 35 points worth of significantly easier answers (relatively speaking) than the remaining points, so it's not a surprise that LLMs got the same easier bits right. (Though I doubt all contestants got their points on exactly the same answers.)<p>But it's certainly unclear what exactly the author meant.
This is not bizarre, it's a reflection of how the IMO is scored: 6 questions with scores from 0-7 but partial credit is rare. It's really a score of 5/6.