fix: ensure anthropic sdk properly resolves when using azure (#25721)

packages/opencode/src/provider/provider.ts

@@ -138,6 +138,14 @@ function useLanguageModel(sdk: any) {
   return sdk.responses === undefined && sdk.chat === undefined
 }
 
+function selectAzureLanguageModel(sdk: any, modelID: string, useChat: boolean) {
+  if (useChat && sdk.chat) return sdk.chat(modelID)
+  if (sdk.responses) return sdk.responses(modelID)
+  if (sdk.messages) return sdk.messages(modelID)
+  if (sdk.chat) return sdk.chat(modelID)
+  return sdk.languageModel(modelID)
+}
+
 function custom(dep: CustomDep): Record<string, CustomLoader> {
   return {
     anthropic: () =>
@@ -222,12 +230,7 @@ function custom(dep: CustomDep): Record<string, CustomLoader> {
       return {
         autoload: false,
         async getModel(sdk: any, modelID: string, options?: Record<string, any>) {
-          if (useLanguageModel(sdk)) return sdk.languageModel(modelID)
-          if (options?.["useCompletionUrls"]) {
-            return sdk.chat(modelID)
-          } else {
-            return sdk.responses(modelID)
-          }
+          return selectAzureLanguageModel(sdk, modelID, Boolean(options?.["useCompletionUrls"]))
         },
         options: {
           resourceName: resource,
@@ -247,12 +250,7 @@ function custom(dep: CustomDep): Record<string, CustomLoader> {
       return {
         autoload: false,
         async getModel(sdk: any, modelID: string, options?: Record<string, any>) {
-          if (useLanguageModel(sdk)) return sdk.languageModel(modelID)
-          if (options?.["useCompletionUrls"]) {
-            return sdk.chat(modelID)
-          } else {
-            return sdk.responses(modelID)
-          }
+          return selectAzureLanguageModel(sdk, modelID, Boolean(options?.["useCompletionUrls"]))
         },
         options: {
           baseURL: resourceName ? `https://${resourceName}.cognitiveservices.azure.com/openai` : undefined,