I definitely think the bigger context window helps. The code quality quite visibly drops across all models I've used as the context fills up, well before the hard limit. The editor tooling also makes a difference—Claude Code pollutes its own context window with miscellaneous file accesses and tool calls as it tries to figure out what to do. Even if it's more manual effort to manage the files that are in-context with Aider, I find the results to be much more consistent when I'm able to micromanage the context.

Approaching the context window limit in Claude Code, having it start to make more and worse mistakes, then seeing it try to compact the context and keep going, is a major "if you find yourself in a hole, stop digging" situation.