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1313 * the installed SDK version does not recognize a model
1414 * billing rules apply that the client cannot model
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16 One billing rule the SDK does model is [data residency pricing](https://platform.claude.com/docs/en/about-claude/pricing#data-residency-pricing). When a response's `usage` reports `inference_geo: "us"`, the SDK multiplies the list price of that response's tokens by 1.1. Per-request fees such as web search aren't multiplied. Requires TypeScript Agent SDK v0.3.239 or later, or Python Agent SDK v0.2.144 or later.
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1618 Use these fields for development insight and approximate budgeting. For authoritative billing, use the [Usage and Cost API](https://platform.claude.com/docs/en/build-with-claude/usage-cost-api) or the Usage page in the [Claude Console](https://platform.claude.com/usage). Do not bill end users or trigger financial decisions from these fields.
1719</Warning>
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