I don't think I'm imagining it – Opus 4.6 is loads better than 4.5 at using its macrodata memory tools. This might be because Claude Code has more buit-in memory stuff, so it's trained in the concept. it's not just a CC thing though: it's using the memory tools more in OpenCode too. Try it yourself:
github.com
GitHub - ascorbic/macrodata: Give Claude Code and OpenCode persistent, self-refining memory and autonomous scheduling.
Give Claude Code and OpenCode persistent, self-refining memory and autonomous scheduling. - ascorbic/macrodata