There has also been changes to way that the default light mode and dark mode is handled. In particular, there is the option on your Account page to switch between Light (Default), Dark, or System; the latter will adopt the preference of either your browser or your operating system. It was a difficult decision as to whether or not to make System the default setting. Even though many members prefer dark mode, the signature look of Project Euler is light mode. So it was felt that any changes to this should be a deliberate choice of the member. Having System as the default would mean that new members who prefer dark mode settings might never see our signature look.

Hopefully these changes shouldn't have any negative unintended consequences impacting site usability, but as always, please report any issues you notice.

The reason for the removal of the fastest solvers tables means that the Eulerians table, which shows the "successes" of recent solvers, has become equally polluted with cheats. As a result, they will be removed in the next day or so. The good news is that at the same time we will be introducing a new data packed table in the Statistics section that shows the ranks of the problem set over the past 28 days, as well as the lowest/highest ranks seen (with dates). The data has only been captured across all problems since 17 April, which marks the time when we made the final tweaks to the rating algorithm, but it already provides useful insights. In addition, below each problem you will be able to see a graph showing the movement of ranks over the past 28 days. The minimal API will also be updated to allow members to capture current snapshots of problem difficulty ranks (using minimal=problems).

Once again, thank you for your understanding, and we hope that this does not detract from the main reason we have such dedicated and engaged members: the problems. We hope that you will enjoy the upcoming problems, especially as we celebrate the publication of the landmark problem 1000 shortly.

However, with the continued improvements in generative AI it is clear that more and more of those fastest solvers have been using genAI tools to solve the problems, undermining the accomplishments of our highly respected and talented members. We have now reached a point where genAI is able to solve almost every new problem we produce and it's only going to get better. Consequently, the fastest solvers tables contain a mixture of the most skilled problem solvers on the planet and others who have been shamelessly taking credit for genAI's ability to solve the problems.

As it is currently impossible to distinguish between those, it is with great sadness that we are removing the fastest solvers tables shortly, with problem 1000 being the last opportunity to earn a place. The team are working hard behind the scenes to find a reliable alternative. But ultimately, we may conclude that this is a fool's errand.

Despite the disappointment felt by the whole team, we can assure you that the regular release of high quality problems will continue to remain our number priority and will not be impacted by this decision.

In lieu of their absence, we would ask that members do not use the problem threads to boast that they were the nth person to solve the problem or make rushed posts as a cheap opportunity to do the same. The threads should remain a place of high quality, instructive dialogue. Any posts that abuse the use of the threads will have posts edited or removed and may result in that member being banned from posting in the threads.

It is hoped that you understand the need to take this regrettable course of action.

The strength of correlation with the current ranks and the new system is very high, so you will not see significant changes, but there will be the occasional problem that might suddenly change levels. Although this might be a little frustrating in the short term, we are hopeful that it provides a better and more meaningful measure in the long term to help guide you on your journey through the problem set.

Generative Artificial Intelligence Tools Policy.