Atlas Language Today

Token usage

What building this project with Claude Code (Opus 5.5, Pro plan) cost in tokens, where the tokens went, and how one long session compares with starting fresh.

Context re-read on every call

Each model call re-sends the whole conversation so far. Without /clear or /compact, this grows with every turn. Vertical lines mark your prompts.

Table

By project step

Step is estimated from the tools each call used (rules in pipeline/tokens.py). Token counts are measured.

Table

Cost of one call: fresh vs late in a long session

Tokens re-read by a single call.

Fixed overhead every call pays

By prompt

Total tokens processed while answering each of your messages (input, cache write, cache read and output).

Table

Plan usage and method

The written analysis is in TOKEN_USAGE.md.