diff --git a/codex-rs/core/tests/suite/client.rs b/codex-rs/core/tests/suite/client.rs
index 432b57de9..e72dfe3e1 100644
--- a/codex-rs/core/tests/suite/client.rs
+++ b/codex-rs/core/tests/suite/client.rs
@@ -1680,7 +1680,7 @@ async fn includes_no_effort_in_request() -> anyhow::Result<()> {
             .get("reasoning")
             .and_then(|t| t.get("effort"))
             .and_then(|v| v.as_str()),
-        Some("xhigh")
+        Some("medium")
     );
 
     Ok(())
@@ -1722,7 +1722,7 @@ async fn includes_default_reasoning_effort_in_request_when_defined_by_model_info
             .get("reasoning")
             .and_then(|t| t.get("effort"))
             .and_then(|v| v.as_str()),
-        Some("xhigh")
+        Some("medium")
     );
 
     Ok(())
diff --git a/codex-rs/models-manager/models.json b/codex-rs/models-manager/models.json
index c025fe36a..bd57d371b 100644
--- a/codex-rs/models-manager/models.json
+++ b/codex-rs/models-manager/models.json
@@ -1,6 +1,6 @@
 {
   "models": [
-    {
+    { 
       "prefer_websockets": true,
       "support_verbosity": true,
       "default_verbosity": "low",
@@ -82,6 +82,13 @@
         "team"
       ],
       "supports_search_tool": true,
+      "service_tiers": [
+        {
+          "id": "priority",
+          "name": "Fast",
+          "description": "1.5x speed, increased usage"
+        }
+      ],
       "additional_speed_tiers": [
         "fast"
       ],
@@ -111,7 +118,7 @@
       "slug": "gpt-5.4",
       "display_name": "gpt-5.4",
       "description": "Strong model for everyday coding.",
-      "default_reasoning_level": "xhigh",
+      "default_reasoning_level": "medium",
       "supported_reasoning_levels": [
         {
           "effort": "low",
@@ -164,6 +171,18 @@
         "team"
       ],
       "supports_search_tool": true,
+      "service_tiers": [
+        {
+          "id": "priority",
+          "name": "Fast",
+          "description": "1.5x speed, increased usage"
+        },
+        {
+          "id": "ultrafast",
+          "name": "Ultrafast",
+          "description": "The fastest available responses for latency-sensitive work."
+        }
+      ],
       "additional_speed_tiers": [
         "fast"
       ],
@@ -249,6 +268,7 @@
         "team"
       ],
       "supports_search_tool": true,
+      "service_tiers": [],
       "additional_speed_tiers": [],
       "supports_reasoning_summaries": true
     },
@@ -332,6 +352,7 @@
         "team"
       ],
       "supports_search_tool": true,
+      "service_tiers": [],
       "additional_speed_tiers": [],
       "supports_reasoning_summaries": true
     },
@@ -411,6 +432,7 @@
         "team"
       ],
       "supports_search_tool": true,
+      "service_tiers": [],
       "additional_speed_tiers": [],
       "supports_reasoning_summaries": true
     },
@@ -491,6 +513,7 @@
         "team"
       ],
       "supports_search_tool": true,
+      "service_tiers": [],
       "additional_speed_tiers": [],
       "supports_reasoning_summaries": true
     }
diff --git a/codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_reasoning_selection_popup.snap b/codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_reasoning_selection_popup.snap
index e527c1462..27c7d061e 100644
--- a/codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_reasoning_selection_popup.snap
+++ b/codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_reasoning_selection_popup.snap
@@ -4,10 +4,9 @@ expression: popup
 ---
   Select Reasoning Level for gpt-5.4
 
-  1. Low                   Fast responses with lighter reasoning
-  2. Medium                Balances speed and reasoning depth for everyday
-                           tasks
-› 3. High (current)        Greater reasoning depth for complex problems
-  4. Extra high (default)  Extra high reasoning depth for complex problems
+  1. Low               Fast responses with lighter reasoning
+  2. Medium (default)  Balances speed and reasoning depth for everyday tasks
+› 3. High (current)    Greater reasoning depth for complex problems
+  4. Extra high        Extra high reasoning depth for complex problems
 
   Press enter to confirm or esc to go back
diff --git a/codex-rs/tui/src/chatwidget/tests/status_command_tests.rs b/codex-rs/tui/src/chatwidget/tests/status_command_tests.rs
index fff328d19..c20631354 100644
--- a/codex-rs/tui/src/chatwidget/tests/status_command_tests.rs
+++ b/codex-rs/tui/src/chatwidget/tests/status_command_tests.rs
@@ -90,7 +90,7 @@ async fn status_command_uses_catalog_default_reasoning_when_config_empty() {
         other => panic!("expected status output, got {other:?}"),
     };
     assert!(
-        rendered.contains("gpt-5.4 (reasoning xhigh, summaries auto)"),
+        rendered.contains("gpt-5.4 (reasoning medium, summaries auto)"),
         "expected /status to render the catalog default reasoning effort, got: {rendered}"
     );
 }