fix(openai): Remove raw OpenAI fields from usage metadata (langchain-ai#9157)

Author: jacoblee93

.changeset/ninety-steaks-invite.md

@@ -0,0 +1,5 @@
+---
+"@langchain/openai": patch
+---
+
+fix(openai): Remove raw OpenAI fields from token usage

libs/langchain-openai/src/tests/chat_models.test.ts

@@ -682,13 +682,9 @@ describe("ChatOpenAI", () => {
         output_tokens: 50,
         total_tokens: 150,
         input_token_details: {
-          cached_tokens: 75,
-          text_tokens: 25,
           cache_read: 75,
         },
         output_token_details: {
-          reasoning_tokens: 10,
-          text_tokens: 40,
           reasoning: 10,
         },
       });

libs/langchain-openai/src/utils/output.ts

@@ -45,16 +45,13 @@ export function handleMultiModalOutput(
 export function _convertOpenAIResponsesUsageToLangChainUsage(
   usage?: OpenAIClient.Responses.ResponseUsage
 ): UsageMetadata {
-  // TODO: Remove raw OpenAI usage details in v1
   const inputTokenDetails = {
     ...(usage?.input_tokens_details?.cached_tokens != null && {
-      ...usage?.input_tokens_details,
       cache_read: usage?.input_tokens_details?.cached_tokens,
     }),
   };
   const outputTokenDetails = {
     ...(usage?.output_tokens_details?.reasoning_tokens != null && {
-      ...usage?.output_tokens_details,
       reasoning: usage?.output_tokens_details?.reasoning_tokens,
     }),
   };