Add transform and latest stainless config from monorepo

Author: stainless-app[bot]

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 97
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai%2Fopenai-82fd6fcb3eea81cbbe09a6f831c82219f1251e1b76474b4c41f424bf277e6a71.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai%2Fopenai-79dcb0ae501ac17004f50aecb112a798290ab3727fbe7c7d1b34299e38ed4f8e.yml
 openapi_spec_hash: c8d54bd1ae3d704f6b6f72ffd2f876d8
-config_hash: 3315d58b60faf63b1bee251b81837cda
+config_hash: 167ad0ca036d0f023c78e6496b4311e8

chatcompletion.go

@@ -1411,6 +1411,19 @@ func UserMessage[T string | []ChatCompletionContentPartUnionParam](content T) Ch
 	return ChatCompletionMessageParamUnion{OfUser: &user}
 }
 
+func ChatCompletionMessageParamOfAssistant[
+	T string | []ChatCompletionAssistantMessageParamContentArrayOfContentPartUnion,
+](content T) ChatCompletionMessageParamUnion {
+	var assistant ChatCompletionAssistantMessageParam
+	switch v := any(content).(type) {
+	case string:
+		assistant.Content.OfString = param.NewOpt(v)
+	case []ChatCompletionAssistantMessageParamContentArrayOfContentPartUnion:
+		assistant.Content.OfArrayOfContentParts = v
+	}
+	return ChatCompletionMessageParamUnion{OfAssistant: &assistant}
+}
+
 func ToolMessage[T string | []ChatCompletionContentPartTextParam](content T, toolCallID string) ChatCompletionMessageParamUnion {
 	var tool ChatCompletionToolMessageParam
 	switch v := any(content).(type) {