diff --git a/lib/llm_eval_ruby/api_clients/langfuse.rb b/lib/llm_eval_ruby/api_clients/langfuse.rb
index 458593b..23b625d 100644
--- a/lib/llm_eval_ruby/api_clients/langfuse.rb
+++ b/lib/llm_eval_ruby/api_clients/langfuse.rb
@@ -71,6 +71,7 @@ def create_generation(params = {})
           release: params[:release] || "UNKNOWN",
           version: params[:version] || "UNKNOWN",
           metadata: params[:metadata] || {},
+          model: params[:metadata] || "UNKNOWN",
           promptName: params[:prompt_name],
           promptVersion: params[:prompt_version]
         }