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fix(llm): capture LiteLLM cost headers and inject into finish providerMetadata - #51957
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…rMetadata LiteLLM 1.98+ omits the primary x-litellm-response-cost header when its value equals x-litellm-response-cost-original (an optimisation introduced to reduce response size). Callers that only read the primary header record $0.00 cost for those responses. Changes: - packages/llm/src/route/transport/http.ts: add a Ref<Record<string,string>> to HttpPrepared as a side-channel; populate it from the HTTP response headers in frames(), reading x-litellm-response-cost with a fallback to x-litellm-response-cost-original when the primary header is absent; also capture x-litellm-key-spend for audit purposes. - packages/llm/src/route/client.ts: after the protocol stream step, map finish and step-finish events to merge providerMetadata.litellm with the captured headers so downstream cost accounting always sees the true value.
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Issue for this PR
Closes #52127
Type of change
What does this PR do?
When using a LiteLLM proxy, some turns were recorded with $0.00 cost in
opencode stats. Two root causes:x-litellm-response-costwhen it equalsx-litellm-response-cost-original, so reading only the primary header misses those responses regardless.This PR captures the authoritative cost directly from the proxy's response headers and attaches it to
finish/step-finishevents viaproviderMetadata.litellm:packages/llm/src/route/transport/http.tsresponseHeaders: Ref.Ref<Record<string,string>>toHttpPreparedas a side-channel, populated after the HTTP response arrives.x-litellm-response-costwith fallback tox-litellm-response-cost-original(handles the 1.98+ omission case). Also capturesx-litellm-key-spendfor audit purposes.packages/llm/src/route/client.tsfinish/step-finishevents to mergeproviderMetadata.litellmwith the captured headers.Preparedkeeps WebSocket transport unaffected without interface changes.How did you verify your code works?
Manually called the proxy
/v1/messagesendpoint twice with identical payloads. Request 1 returnedx-litellm-response-cost: 0.000434; request 2 omitted that header but includedx-litellm-response-cost-original: 0.000434. The fallback logic covers both cases. Could not runbun typecheck(tsgounavailable in the environment) — happy to iterate on types if CI catches anything.Screenshots / recordings
N/A — no UI change.
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