diff --git a/.codex/config.toml b/.codex/config.toml
index 2e37a27..3d3c8f6 100644
--- a/.codex/config.toml
+++ b/.codex/config.toml
@@ -1,5 +1,5 @@
-model = "gpt-5.3-codex"
-model_reasoning_effort = "medium"
+model = "gpt-5.4"
+model_reasoning_effort = "xhigh"
 check_for_update_on_startup = false
 approval_policy = "on-request"
 sandbox_mode = "read-only"