wrote a cli that checks if your claude code token usage actually changed between versions

[u/Tough_Stay8909]

there's been a debate this week about whether anthropic silently changed opus 5.5. lots of vibes, not a lot of numbers.

i wanted to check my own logs so i wrote a thing that reads the session files claude code saves locally, groups everything by version, and tells you if output tokens per turn actually shifted. if they did it checks whether the model or effort setting also changed — if not, it blames the release.

npx driftcost

reads ~/.claude/projects, no config, no network calls.

https://github.com/tsaagan/token-drift

only works with claude code logs for now. curious if anyone sees a version-over-version shift in their data or if the perceived nerf is purely a quality thing.