Token-cost benchmarking for `img2threejs` model generation pipeline.
Raw Developer Origin & Technical Request
GitHub Issue
Jul 17, 2026
## Motivation
The numbers in `docs/TOKEN_COST.md` are honest **engineering estimates**, not a measurement. Replacing them with a reproducible benchmark makes the token-efficiency claim credible and lets us track regressions.
## Scope
- A harness that runs N full reconstructions (fixed reference set) and records **real model-token spend** per stage (assessment, spec, codegen, each render-review cycle).
- Emit a table + per-stage breakdown, and a delta vs. the previous run.
- Keep it deterministic where possible so results are comparable across runs.
## Pointers
- `docs/TOKEN_COST.md` (the estimate tables to replace)
- `ROADMAP.md` (v1.5 — "measured token-cost benchmark replacing the current estimates")
## Acceptance criteria
- `scripts/benchmark_token_cost.py` (pure-stdlib, matching the repo's zero-dep tooling) produces a measured cost table.
- `docs/TOKEN_COST.md` gains a "Measured" section alongside the estimates.
**Difficulty:** medium · **Labels:** good first issue for someone who wants to learn the pipeline end to end.
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