diff --git a/internal/runtime/executor/claude_executor.go b/internal/runtime/executor/claude_executor.go
index 8e0d15a6..9d8ad260 100644
--- a/internal/runtime/executor/claude_executor.go
+++ b/internal/runtime/executor/claude_executor.go
@@ -110,10 +110,6 @@ func (e *ClaudeExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, r
 		return resp, err
 	}
 
-	if !strings.HasPrefix(baseModel, "claude-3-5-haiku") {
-		body = checkSystemInstructions(body)
-	}
-
 	// Apply cloaking (system prompt injection, fake user ID, sensitive word obfuscation)
 	// based on client type and configuration.
 	body = applyCloaking(ctx, e.cfg, auth, body, baseModel)
@@ -245,8 +241,6 @@ func (e *ClaudeExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.A
 		return nil, err
 	}
 
-	body = checkSystemInstructions(body)
-
 	// Apply cloaking (system prompt injection, fake user ID, sensitive word obfuscation)
 	// based on client type and configuration.
 	body = applyCloaking(ctx, e.cfg, auth, body, baseModel)