diff --git a/codex-rs/code b/codex-rs/code
new file mode 100644
index 00000000..e69de29b
diff --git a/codex-rs/core/src/client.rs b/codex-rs/core/src/client.rs
index e088f9c3..39a6aff8 100644
--- a/codex-rs/core/src/client.rs
+++ b/codex-rs/core/src/client.rs
@@ -184,19 +184,23 @@ impl ModelClient {
 
         let input_with_instructions = prompt.get_formatted_input();
 
-        // Only include `text.verbosity` for GPT-5 family models
-        let text = if self.config.model_family.family == "gpt-5" {
-            create_text_param_for_request(self.config.model_verbosity, &prompt.output_schema)
-        } else {
-            if self.config.model_verbosity.is_some() {
-                warn!(
-                    "model_verbosity is set but ignored for non-gpt-5 model family: {}",
-                    self.config.model_family.family
-                );
+        let verbosity = match &self.config.model_family.family {
+            family if family == "gpt-5" => self.config.model_verbosity,
+            _ => {
+                if self.config.model_verbosity.is_some() {
+                    warn!(
+                        "model_verbosity is set but ignored for non-gpt-5 model family: {}",
+                        self.config.model_family.family
+                    );
+                }
+
+                None
             }
-            None
         };
 
+        // Only include `text.verbosity` for GPT-5 family models
+        let text = create_text_param_for_request(verbosity, &prompt.output_schema);
+
         // In general, we want to explicitly send `store: false` when using the Responses API,
         // but in practice, the Azure Responses API rejects `store: false`:
         //
diff --git a/codex-rs/core/tests/suite/json_result.rs b/codex-rs/core/tests/suite/json_result.rs
index 43d5cb4b..86da33f7 100644
--- a/codex-rs/core/tests/suite/json_result.rs
+++ b/codex-rs/core/tests/suite/json_result.rs
@@ -30,7 +30,16 @@ const SCHEMA: &str = r#"
 "#;
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn codex_returns_json_result() -> anyhow::Result<()> {
+async fn codex_returns_json_result_for_gpt5() -> anyhow::Result<()> {
+    codex_returns_json_result("gpt-5".to_string()).await
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn codex_returns_json_result_for_gpt5_codex() -> anyhow::Result<()> {
+    codex_returns_json_result("gpt-5-codex".to_string()).await
+}
+
+async fn codex_returns_json_result(model: String) -> anyhow::Result<()> {
     non_sandbox_test!(result);
 
     let server = start_mock_server().await;
@@ -72,7 +81,7 @@ async fn codex_returns_json_result() -> anyhow::Result<()> {
             cwd: cwd.path().to_path_buf(),
             approval_policy: AskForApproval::Never,
             sandbox_policy: SandboxPolicy::DangerFullAccess,
-            model: "gpt-5".to_string(),
+            model,
             effort: None,
             summary: ReasoningSummary::Auto,
         })