ProjectEuler+ 2025-10-14
As mentioned at euler.stephan-brumme.com these tend to be harder, as they have their own judge system that actually runs programs, and therefore can test input multiple test cases against their reference implementation rather than just hard testing the result for a single input.
Goes only up to Project Euler problem 254 as of 2025, which had been published much much earlier, in 2009, so presumably they've stopped there.
Cool deeptech ones:
Boring ones:
International ones with a British presence:
ARC-AGI visualization Created 2025-10-14 Updated 2025-12-13
www.kaggle.com/code/allegich/arc-agi-2025-visualization-all-1000-120-tasks contains plots of all questions and answers. It is truly very convenient.
Sakana.AI Created 2025-10-14 Updated 2025-12-01
Their description is a bit of localization randomness:
We are building a world class AI research lab in Tokyo.
We want to develop AI solutions for Japan's needs, and democratize AI in Japan.
Video 1.
I Co-Invented the Transformer. Now I'm Replacing It.
Source. Interview with Sakana.AI co-founders Llion Jones and Luke Darlow by Machine Learning Street Talk published Nov 23, 2025.
LeanAgent 2025-10-14
They do have a database system which is interesting.
Putnam-AXIOM Created 2025-10-14 Updated 2025-12-02
We introduce Putnam-AXIOM, a benchmark of 522 university-level competition problems drawn from the prestigious William Lowell Putnam Mathematical Competition, and Putnam-AXIOM Variation, an unseen companion set of 100 functional variants generated by programmatically perturbing variables and constants.
MathArena Created 2025-10-14 Updated 2025-12-13
This project tests various models against various competitions.
How they "ensure" that models are not contaminated:
By evaluating models as soon as new problems are released, we effectively eliminate the risk of contamination
Most of their problems come from high school knowledge olympiads and they are therefore completely irrelevant for 2025 LLMs.
LIGO 2025-10-14
Video 1.
LIGO documentary by Advanced LIGO Documentary Project
. Source.

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