Methodology

What we measure, how, and when. If a claim lacks a date here or on a data page, treat it as void.

Sources

Provider /models endpoints where public (OpenRouter first).
Manual price-sheet CSV with verifier initials when no API exists.
Snapshots are written nightly as committed JSON — git history is the audit trail.

Verification

Daily sweep at 06:00 UTC.
Fixed 1k-in/256-out prompt per provider; billed tokens recorded.
Moves beyond ±1% raise a price move and land in the RSS feed.
Rows older than 14 days carry the amber "stale" flag until re-probed.

Corrections

Wrong number? File an issue against the site repo. Corrections re-probe within one sweep cycle and never silently rewrite history — the snapshot diff stays visible.