fix(openai): make gpt-5 family reasoning models (#8646)

hntrl · web-flow · commit c41deda25233 · 2025-08-07T16:09:24.000-07:00
diff --git a/libs/langchain-openai/src/chat_models.ts b/libs/langchain-openai/src/chat_models.ts
@@ -140,7 +140,7 @@ function isBuiltInToolChoice(
 }
 
 function isReasoningModel(model?: string) {
-  return model && /^o\d/.test(model);
+  return model && (/^o\d/.test(model) || model.startsWith("gpt-5"));
 }
 
 function isStructuredOutputMethodParams(

Original file line number	Diff line number	Diff line change
`@@ -140,7 +140,7 @@ function isBuiltInToolChoice(`
`140`	`140`	`}`
`141`	`141`
`142`	`142`	`function isReasoningModel(model?: string) {`
`143`		`- return model && /^o\d/.test(model);`
	`143`	`+ return model && (/^o\d/.test(model) \|\| model.startsWith("gpt-5"));`
`144`	`144`	`}`
`145`	`145`
`146`	`146`	`function isStructuredOutputMethodParams(`