diff --git a/src/cliproxy/sync/profile-mapper.ts b/src/cliproxy/sync/profile-mapper.ts
index cb4b7a10..3a4a120c 100644
--- a/src/cliproxy/sync/profile-mapper.ts
+++ b/src/cliproxy/sync/profile-mapper.ts
@@ -150,14 +150,21 @@ export function mapProfileToClaudeKey(profile: SyncableProfile): ClaudeKey | nul
       },
     ];
 
-    // Append extra models from ANTHROPIC_EXTRA_MODELS env var (comma-separated)
+    // Append extra models from ANTHROPIC_EXTRA_MODELS env var (comma-separated).
+    // Skip duplicates of the primary model and any repeated entries to keep
+    // the synced CLIProxy `models` array clean.
     const extraModelsRaw = env.ANTHROPIC_EXTRA_MODELS;
     if (extraModelsRaw && extraModelsRaw.trim()) {
+      const seen = new Set<string>([modelName]);
       const extraModels = extraModelsRaw
         .split(',')
         .map((m) => m.trim())
         .filter((m) => m.length > 0);
       for (const extra of extraModels) {
+        if (seen.has(extra)) {
+          continue;
+        }
+        seen.add(extra);
         claudeKey.models.push({
           name: extra,
           alias: '',