The contest ended a few days ago, some teams have already published their writeups. Usage of LLM-based tools appear to have mixed results. For example, I think #23 place claimed to have used nothing but AI[1], while the #24 place seems to be mostly manual code[2]. These are very good results considering they solved all problems, only 40 out of ~268 teams managed to do that[3].

[1] https://blog.greg.technology/2026/07/26/doing-okayish-with-a...

[2] http://www.sawicki.us/icfp/2026/

[3] https://icfpcontest2026.com/standings

I went through the 3 days without using any AI, working mostly in the language designed by the judges. I placed somewhere in the middle.