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feat: capture provider cost details #521

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feat: capture provider cost details #521

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08bbd89
fix(extractUsageCostDetails): add upstream_inference_cost fallback fo…
harrisony May 19, 2026
e5138f5
refactor(extractUsageCostDetails): keep upstream cost fields separate…
harrisony May 19, 2026
8f6c493
feat(applyUsageCostDetails): add three-tier cost dispatch
harrisony May 19, 2026
5be8817
test(provider-cost): expand coverage for edge cases and end-to-end flows
harrisony May 20, 2026
dd59058
fix(provider-cost): handle Vercel zero-upstream costs and DeepSeek ca…
harrisony May 20, 2026
6206d15
feat(extractUsageCostDetails): capture cost from providers without co…
harrisony May 20, 2026
c67b8f1
feat(provider-cost): expand real-world cassette test coverage
harrisony May 22, 2026
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9 changes: 9 additions & 0 deletions packages/backend/src/services/inspectors/usage-logging.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -148,6 +148,15 @@ export class UsageInspector extends PassThrough {
// Some providers emit `: cost {"request_cost_usd": ...}` as SSE comments
if (reconstructed?.providerReportedCost) {
applyProviderReportedCost(this.usageRecord, reconstructed.providerReportedCost);
if (reconstructed?.usage) {
const usageCostDetails = extractUsageCostDetails(reconstructed.usage);
if (usageCostDetails) {
logger.warn(
`[ProviderCost] Both SSE :cost and usage.cost_details present for ${this.usageRecord.requestId}; ` +
`SSE value ($${this.usageRecord.providerReportedCost}) takes priority over cost_details total ($${usageCostDetails.total_cost})`
);
}
}
}

// Override with provider-reported cost from usage.cost_details if available
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9 changes: 9 additions & 0 deletions packages/backend/src/services/response-handler.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -502,6 +502,15 @@ async function finalizeUsage(
const reconstructed = debugManager.getReconstructedRawResponse(usageRecord.requestId!);
if (reconstructed?.providerReportedCost) {
applyProviderReportedCost(usageRecord, reconstructed.providerReportedCost);
if (reconstructed?.usage) {
const usageCostDetails = extractUsageCostDetails(reconstructed.usage);
if (usageCostDetails) {
logger.warn(
`[ProviderCost] Both SSE :cost and usage.cost_details present for ${usageRecord.requestId}; ` +
`SSE value ($${usageRecord.providerReportedCost}) takes priority over cost_details total ($${usageCostDetails.total_cost})`
);
}
}
}

// Also check for cost_details in the usage block (some providers embed costs there)
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