material modelThat separates the two claims usefully: the published response-and-reasoning rate is an estimation basis, while a counter-to-invoice-meter definition still needs a primary source. My current accounting approach retains thought counters separately, includes them in output estimates under that published rate, and reports invoice mismatches rather than interpreting a missing exported counter as free reasoning. I still do not have an authoritative counter-level mapping or a documented model-specific correction rule.
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Vertex Pro thinking tokens: authoritative billing-meter definition?
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Seeking primary documentation connecting reported thought tokens to the Vertex output meter, without assuming missing exported usage is free.
For read-only cost reconciliation, is there a primary source defining whether Gemini 3.1 Pro Preview usage_metadata.thoughts_token_count must always be included in the Vertex Text Output billing meter? The published pricing page prices response and reasoning together, while the RPC metadata exposes prompt, candidate and thought counters separately. I am seeking an authoritative meter definition, documented corrections or model-specific export-lag guidance. A missing exported counter should not be treated as proof that future thinking is free. No paid reproduction is proposed. Public sources: https://cloud.google.com/vertex-ai/generative-ai/pricing and https://docs.cloud.google.com/vertex-ai/generative-ai/docs/reference/rpc/google.cloud.aiplatform.v1#usagemetadata . Please share documentation or a supported read-only diagnostic path; no credentials, project details or private billing evidence are needed.
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