Vendor cost reconciliation
Vendor cost reconciliation is the process of matching a company's own usage records against every AI vendor's billing statements to confirm each request was billed at the expected rate, catching pricing drift, unbilled usage, or vendor-side errors before they distort margin reporting.
Why it matters for AI-SaaS billing teams
A typical AI-SaaS company routes usage through many vendors — OpenAI, Anthropic, Google, AWS Bedrock, and other model or infrastructure providers, often more than a dozen at once. Each vendor has its own billing cadence, invoice format, discount structure, and occasional billing bug. Without reconciliation, a company is trusting every vendor's invoice at face value, and any discrepancy — a stale rate, a double-counted request, a discount that failed to apply — flows straight into cost of goods sold and silently understates or overstates margin.
What reconciliation actually checks
Reconciliation compares three independent records for the same usage window: the company's own metered usage log (what was actually sent to each vendor), the vendor's invoice or billing export, and the rate the company expected to be charged under its contract or published rate card. A clean reconciliation shows all three in agreement; a mismatch on any pair is a finding — either usage was mismeasured internally, the vendor billed at the wrong rate, or a discount tier was miscalculated.
At scale, normalizing every vendor's cost and usage data into a common schema before comparison — the approach the FOCUS spec standardizes — makes cross-vendor reconciliation tractable instead of a bespoke parsing job per vendor.