diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..8fb44a9
Binary files /dev/null and b/.DS_Store differ
diff --git a/src/types/generate_content.rs b/src/types/generate_content.rs
index 6c53407..e508f60 100644
--- a/src/types/generate_content.rs
+++ b/src/types/generate_content.rs
@@ -198,7 +198,8 @@ impl GenerationConfigBuilder {
 #[serde(rename_all = "camelCase")]
 pub struct ThinkingConfig {
     pub include_thoughts: bool,
-    pub thinking_budget: isize,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub thinking_budget: Option<isize>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub thinking_level: Option<ThinkingLevel>,
 }