diff --git a/codex-rs/common/src/model_presets.rs b/codex-rs/common/src/model_presets.rs
index cf536119..8606fcaf 100644
--- a/codex-rs/common/src/model_presets.rs
+++ b/codex-rs/common/src/model_presets.rs
@@ -50,10 +50,24 @@ pub fn builtin_model_presets() -> &'static [ModelPreset] {
             effort: Some(ReasoningEffort::High),
         },
         ModelPreset {
-            id: "gpt-5-high-new",
-            label: "gpt-5 high new",
-            description: "— our latest release tuned to rely on the model's built-in reasoning defaults",
-            model: "gpt-5-high-new",
+            id: "swiftfox-low",
+            label: "swiftfox low",
+            description: "— balances speed with some reasoning; useful for straightforward queries and short explanations",
+            model: "swiftfox-low",
+            effort: None,
+        },
+        ModelPreset {
+            id: "swiftfox-medium",
+            label: "swiftfox medium",
+            description: "— default setting; provides a solid balance of reasoning depth and latency for general-purpose tasks",
+            model: "swiftfox-medium",
+            effort: None,
+        },
+        ModelPreset {
+            id: "swiftfox-high",
+            label: "swiftfox high",
+            description: "",
+            model: "swiftfox-high",
             effort: None,
         },
     ];
diff --git a/codex-rs/core/src/config.rs b/codex-rs/core/src/config.rs
index 53e246d2..4e010ae7 100644
--- a/codex-rs/core/src/config.rs
+++ b/codex-rs/core/src/config.rs
@@ -33,7 +33,7 @@ use toml_edit::DocumentMut;
 
 const OPENAI_DEFAULT_MODEL: &str = "gpt-5";
 const OPENAI_DEFAULT_REVIEW_MODEL: &str = "gpt-5";
-pub const GPT5_HIGH_MODEL: &str = "gpt-5-high-new";
+pub const SWIFTFOX_MEDIUM_MODEL: &str = "swiftfox-medium";
 
 /// Maximum number of bytes of the documentation that will be embedded. Larger
 /// files are *silently truncated* to this size so we do not take up too much of
@@ -1184,7 +1184,7 @@ exclude_slash_tmp = true
         persist_model_selection(
             codex_home.path(),
             None,
-            "gpt-5-high-new",
+            "swiftfox-high",
             Some(ReasoningEffort::High),
         )
         .await?;
@@ -1193,7 +1193,7 @@ exclude_slash_tmp = true
             tokio::fs::read_to_string(codex_home.path().join(CONFIG_TOML_FILE)).await?;
         let parsed: ConfigToml = toml::from_str(&serialized)?;
 
-        assert_eq!(parsed.model.as_deref(), Some("gpt-5-high-new"));
+        assert_eq!(parsed.model.as_deref(), Some("swiftfox-high"));
         assert_eq!(parsed.model_reasoning_effort, Some(ReasoningEffort::High));
 
         Ok(())
@@ -1247,8 +1247,8 @@ model = "gpt-4.1"
         persist_model_selection(
             codex_home.path(),
             Some("dev"),
-            "gpt-5-high-new",
-            Some(ReasoningEffort::Low),
+            "swiftfox-medium",
+            Some(ReasoningEffort::Medium),
         )
         .await?;
 
@@ -1260,8 +1260,11 @@ model = "gpt-4.1"
             .get("dev")
             .expect("profile should be created");
 
-        assert_eq!(profile.model.as_deref(), Some("gpt-5-high-new"));
-        assert_eq!(profile.model_reasoning_effort, Some(ReasoningEffort::Low));
+        assert_eq!(profile.model.as_deref(), Some("swiftfox-medium"));
+        assert_eq!(
+            profile.model_reasoning_effort,
+            Some(ReasoningEffort::Medium)
+        );
 
         Ok(())
     }
diff --git a/codex-rs/tui/src/lib.rs b/codex-rs/tui/src/lib.rs
index 7971ccf4..a9528dc8 100644
--- a/codex-rs/tui/src/lib.rs
+++ b/codex-rs/tui/src/lib.rs
@@ -11,7 +11,7 @@ use codex_core::RolloutRecorder;
 use codex_core::config::Config;
 use codex_core::config::ConfigOverrides;
 use codex_core::config::ConfigToml;
-use codex_core::config::GPT5_HIGH_MODEL;
+use codex_core::config::SWIFTFOX_MEDIUM_MODEL;
 use codex_core::config::find_codex_home;
 use codex_core::config::load_config_as_toml_with_cli_overrides;
 use codex_core::config::persist_model_selection;
@@ -380,7 +380,7 @@ async fn run_ratatui_app(
         let switch_to_new_model = upgrade_decision == ModelUpgradeDecision::Switch;
 
         if switch_to_new_model {
-            config.model = GPT5_HIGH_MODEL.to_owned();
+            config.model = SWIFTFOX_MEDIUM_MODEL.to_owned();
             config.model_reasoning_effort = None;
             if let Err(e) = persist_model_selection(
                 &config.codex_home,
diff --git a/codex-rs/tui/src/new_model_popup.rs b/codex-rs/tui/src/new_model_popup.rs
index ff09573e..0d709284 100644
--- a/codex-rs/tui/src/new_model_popup.rs
+++ b/codex-rs/tui/src/new_model_popup.rs
@@ -1,7 +1,7 @@
 use crate::tui::FrameRequester;
 use crate::tui::Tui;
 use crate::tui::TuiEvent;
-use codex_core::config::GPT5_HIGH_MODEL;
+use codex_core::config::SWIFTFOX_MEDIUM_MODEL;
 use color_eyre::eyre::Result;
 use crossterm::event::KeyCode;
 use crossterm::event::KeyEvent;
@@ -83,7 +83,8 @@ impl WidgetRef for &ModelUpgradePopup {
 
         let mut lines: Vec<Line> = vec![
             String::new().into(),
-            format!("   Codex is now powered by {GPT5_HIGH_MODEL}, a new model that is").into(),
+            format!("   Codex is now powered by {SWIFTFOX_MEDIUM_MODEL}, a new model that is")
+                .into(),
             Line::from(vec![
                 "   ".into(),
                 "faster, a better collaborator, ".bold(),
@@ -108,7 +109,7 @@ impl WidgetRef for &ModelUpgradePopup {
         lines.push(create_option(
             0,
             ModelUpgradeOption::TryNewModel,
-            &format!("Yes, switch me to {GPT5_HIGH_MODEL}"),
+            &format!("Yes, switch me to {SWIFTFOX_MEDIUM_MODEL}"),
         ));
         lines.push(create_option(
             1,