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claude-code · March 22, 2026 · 12 min read

Claude Code Token Metrics: Technical Appendix

Source code verification, data model reference, pricing tables, reproduction scripts, and the full format evolution timeline behind our token metrics investigation.

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claude-code · Mar 22, 2026

Understanding Claude Code Token Metrics: What the Numbers Actually Mean

I got 4 different token counts from the same usage data. After reverse-engineering the JSONL format and reading every tool's source code, here's what's actually going on.

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