Really long-term task benchmark showing significant improvements in very recent models, while also showing really bad regression rates across the board.

To me using agents daily, the long term vision with maintainability in mind really makes the difference between us humans and agents, I like the idea. However evaluating long term maintainability over an average of just 500 loc changes does not sound like long term maintainability being measured here

> The benchmark comprises 100 tasks, each corresponding on average to an evolution history spanning 233 days and 71 consecutive commits in a real-world code repository.

This seems like a really cool thing to benchmark! Technically it'd be possible to take GitHub repos that the AI orgs probably already have, cross-reference the code against the issues and regressions, and train/validate on that.

The dataset would need to be way bigger to get close to the likes of SWE-bench: https://www.swebench.com/original.html

"Vibe coded stuff gets hard to maintain and will end up buggy." Yeah, so make models that deal with that better, optimize for maintainability and consistency.

Cool to see Claude doing decently though!