diff --git a/crates/open_ai/src/open_ai.rs b/crates/open_ai/src/open_ai.rs
index 5801f29623..8bbe858995 100644
--- a/crates/open_ai/src/open_ai.rs
+++ b/crates/open_ai/src/open_ai.rs
@@ -257,6 +257,7 @@ pub struct Request {
     pub tools: Vec<ToolDefinition>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub prompt_cache_key: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub reasoning_effort: Option<ReasoningEffort>,
 }