feat: support claude code max plans on Portkey

Author: siddharthsambharia-portkey

src/providers/anthropic/api.ts

@@ -2,20 +2,16 @@ import { ProviderAPIConfig } from '../types';
 
 const AnthropicAPIConfig: ProviderAPIConfig = {
   getBaseURL: () => 'https://api.anthropic.com/v1',
-  headers: ({ providerOptions, fn, gatewayRequestBody }) => {
+  headers: ({ providerOptions, fn, headers: requestHeaders }) => {
+    const apiKey =
+      providerOptions.apiKey || requestHeaders?.['x-api-key'] || '';
     const headers: Record<string, string> = {
-      'X-API-Key': `${providerOptions.apiKey}`,
+      'X-API-Key': apiKey,
     };
 
-    // Accept anthropic_beta and anthropic_version in body to support enviroments which cannot send it in headers.
     const betaHeader =
-      providerOptions?.['anthropicBeta'] ??
-      gatewayRequestBody?.['anthropic_beta'] ??
-      'messages-2023-12-15';
-    const version =
-      providerOptions?.['anthropicVersion'] ??
-      gatewayRequestBody?.['anthropic_version'] ??
-      '2023-06-01';
+      providerOptions?.['anthropicBeta'] ?? 'messages-2023-12-15';
+    const version = providerOptions?.['anthropicVersion'] ?? '2023-06-01';
 
     if (fn === 'chatComplete') {
       headers['anthropic-beta'] = betaHeader;
@@ -31,10 +27,12 @@ const AnthropicAPIConfig: ProviderAPIConfig = {
         return '/messages';
       case 'messages':
         return '/messages';
+      case 'messagesCountTokens':
+        return '/messages/count_tokens';
       default:
         return '';
     }
   },
 };
 
-export default AnthropicAPIConfig;
+export default AnthropicAPIConfig;