Dev builds npx driftcost CLI to check if Claude Code token usage silently shifted between Opus versions
Tough_Stay8909 · reddit · 2026-11-12
Amid this week's debate over whether Anthropic silently changed Opus 5.5 — lots of vibes, few numbers — a developer built a CLI to check their own logs.
- npx driftcost reads the session files Claude Code saves locally (/.claude/projects), no config, no network calls.
- It groups output tokens per turn by version and flags whether usage actually shifted between releases; if so, it cross-checks whether the model or effort setting also changed — if neither did, it blames the release.
Currently limited to Claude Code logs. Open source at github.com/tsaagan/token-drift.
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