Update models.json (#31684)

Automated update of models.json.

---------

Co-authored-by: sayan-oai <244841968+sayan-oai@users.noreply.github.com>
Co-authored-by: sayan-oai <sayan@openai.com>

codex-rs/core/src/session/tests.rs

@@ -4170,6 +4170,10 @@ fn text_block(s: &str) -> serde_json::Value {
 async fn build_test_config(codex_home: &Path) -> Config {
     ConfigBuilder::without_managed_config_for_tests()
         .codex_home(codex_home.to_path_buf())
+        .harness_overrides(ConfigOverrides {
+            model: Some("gpt-5.5".to_string()),
+            ..Default::default()
+        })
         .build()
         .await
         .expect("load default test config")