In (1) the author use a technique to improve the performance of an LLM, he trained sonnet 3.5 to obtain 53,6% in the arc-agi-pub benchmark moreover he said that more computer power would give better results. So the results of o3 could be produced in this way using the same method with more computer power, so if this is the case the result of o3 is not very interesting.

(1) https://params.com/@jeremy-berman/arc-agi