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refactor(ai-gateway): clarify usage/generation cost mismatch warning #4869

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Merged
chrarnoldus merged 1 commit into from
Jul 30, 2026
Merged

refactor(ai-gateway): clarify usage/generation cost mismatch warning #4869

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16 changes: 12 additions & 4 deletions apps/web/src/lib/ai-gateway/processUsage.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1253,11 +1253,19 @@ export async function processTokenData(
genStats.status_code = usageStats.status_code; // retain by choice
genStats.streamed ??= usageContext.isStreaming;
if (genStats.cost_mUsd !== usageStats.cost_mUsd) {
// The provider's generation lookup and the response's own usage payload should
// yield the same cost. A mismatch means inconsistent token or pricing data from
// the provider; the generation lookup values win (see assignment below).
console.warn(
`DEV ODDITY / WARNING: Usage stats do not match generation data:`,
genStats.model,
[genStats.cost_mUsd, usageStats.cost_mUsd],
[genStats.cacheDiscount_mUsd, usageStats.cacheDiscount_mUsd]
'Cost from provider generation lookup differs from cost computed from response usage data:',
{
model: genStats.model,
cost_mUsd: { generation: genStats.cost_mUsd, response: usageStats.cost_mUsd },
cacheDiscount_mUsd: {
generation: genStats.cacheDiscount_mUsd,
response: usageStats.cacheDiscount_mUsd,
},
}
);
}
usageStats = genStats;
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