only map if body mapping is OPENAI

Author: connortbot

packages/cost/models/providers/anthropic.ts

@@ -23,20 +23,22 @@ export class AnthropicProvider extends BaseProvider {
     _modelProviderConfig: ModelProviderConfig,
     userConfig: UserEndpointConfig
   ): string {
-    if (userConfig.gatewayMapping === "NO_MAPPING") {
-      return "https://api.anthropic.com/v1/messages";
-    }
     return "https://api.anthropic.com/v1/messages";
   }
 
   authenticate(context: AuthContext): AuthResult {
     const headers: Record<string, string> = {};
     headers["x-api-key"] = context.apiKey || "";
-    headers["anthropic-version"] = "2023-06-01";
+    if (context.bodyMapping === "OPENAI") {
+      headers["anthropic-version"] = "2023-06-01";
+    } // if NO_MAPPING, then we can assume the header is already added (e.g by anthropic SDK)
     return { headers };
   }
 
   buildRequestBody(endpoint: Endpoint, context: RequestBodyContext): string {
+    if (context.bodyMapping === "NO_MAPPING") {
+      return JSON.stringify(context.parsedBody); // return without mapping
+    }
     const anthropicBody = context.toAnthropic(context.parsedBody);
     const updatedBody = {
       ...anthropicBody,