feat: arcticfox in the wild (#6906)

<img width="485" height="600" alt="image"
src="https://github.com/user-attachments/assets/4341740d-dd58-4a3e-b69a-33a3be0606c5"
/>

---------

Co-authored-by: jif-oai <jif@openai.com>

codex-rs/core/src/client_common.rs

@@ -422,7 +422,7 @@ mod tests {
                 expects_apply_patch_instructions: false,
             },
             InstructionsTestCase {
-                slug: "arcticfox",
+                slug: "gpt-5.1-codex-max",
                 expects_apply_patch_instructions: false,
             },
         ];

codex-rs/core/src/config/edit.rs

@@ -846,7 +846,7 @@ hide_gpt5_1_migration_prompt = true
     }
 
     #[test]
-    fn blocking_set_hide_arcticfox_migration_prompt_preserves_table() {
+    fn blocking_set_hide_gpt_5_1_codex_max_migration_prompt_preserves_table() {
         let tmp = tempdir().expect("tmpdir");
         let codex_home = tmp.path();
         std::fs::write(
@@ -860,7 +860,7 @@ existing = "value"
             codex_home,
             None,
             &[ConfigEdit::SetNoticeHideModelMigrationPrompt(
-                "hide_arcticfox_migration_prompt".to_string(),
+                "hide_gpt-5.1-codex-max_migration_prompt".to_string(),
                 true,
             )],
         )
@@ -870,7 +870,7 @@ existing = "value"
             std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
         let expected = r#"[notice]
 existing = "value"
-hide_arcticfox_migration_prompt = true
+"hide_gpt-5.1-codex-max_migration_prompt" = true
 "#;
         assert_eq!(contents, expected);
     }

codex-rs/core/src/config/mod.rs

@@ -62,11 +62,11 @@ pub mod profile;
 pub mod types;
 
 #[cfg(target_os = "windows")]
-pub const OPENAI_DEFAULT_MODEL: &str = "arcticfox";
+pub const OPENAI_DEFAULT_MODEL: &str = "gpt-5.1-codex-max";
 #[cfg(not(target_os = "windows"))]
-pub const OPENAI_DEFAULT_MODEL: &str = "arcticfox";
-const OPENAI_DEFAULT_REVIEW_MODEL: &str = "arcticfox";
-pub const GPT_5_CODEX_MEDIUM_MODEL: &str = "arcticfox";
+pub const OPENAI_DEFAULT_MODEL: &str = "gpt-5.1-codex-max";
+const OPENAI_DEFAULT_REVIEW_MODEL: &str = "gpt-5.1-codex-max";
+pub const GPT_5_CODEX_MEDIUM_MODEL: &str = "gpt-5.1-codex-max";
 
 /// 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
@@ -81,7 +81,7 @@ pub struct Config {
     /// Optional override of model selection.
     pub model: String,
 
-    /// Model used specifically for review sessions. Defaults to "arcticfox".
+    /// Model used specifically for review sessions. Defaults to "gpt-5.1-codex-max".
     pub review_model: String,
 
     pub model_family: ModelFamily,

codex-rs/core/src/config/types.rs

@@ -378,8 +378,8 @@ pub struct Notice {
     pub hide_rate_limit_model_nudge: Option<bool>,
     /// Tracks whether the user has seen the model migration prompt
     pub hide_gpt5_1_migration_prompt: Option<bool>,
-    /// Tracks whether the user has seen the arcticfox migration prompt
-    pub hide_arcticfox_migration_prompt: Option<bool>,
+    /// Tracks whether the user has seen the gpt-5.1-codex-max migration prompt
+    pub hide_gpt_5_1_codex_max_migration_prompt: Option<bool>,
 }
 
 impl Notice {

codex-rs/core/src/model_family.rs

@@ -12,7 +12,7 @@ const BASE_INSTRUCTIONS: &str = include_str!("../prompt.md");
 
 const GPT_5_CODEX_INSTRUCTIONS: &str = include_str!("../gpt_5_codex_prompt.md");
 const GPT_5_1_INSTRUCTIONS: &str = include_str!("../gpt_5_1_prompt.md");
-const ARCTICFOX_INSTRUCTIONS: &str = include_str!("../arcticfox_prompt.md");
+const GPT_5_1_CODEX_MAX_INSTRUCTIONS: &str = include_str!("../gpt-5.1-codex-max_prompt.md");
 
 /// A model family is a group of models that share certain characteristics.
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
@@ -173,12 +173,12 @@ pub fn find_family_for_model(slug: &str) -> Option<ModelFamily> {
             support_verbosity: true,
             truncation_policy: TruncationPolicy::Tokens(10_000),
         )
-    } else if slug.starts_with("arcticfox") {
+    } else if slug.starts_with("gpt-5.1-codex-max") {
         model_family!(
             slug, slug,
             supports_reasoning_summaries: true,
             reasoning_summary_format: ReasoningSummaryFormat::Experimental,
-            base_instructions: ARCTICFOX_INSTRUCTIONS.to_string(),
+            base_instructions: GPT_5_1_CODEX_MAX_INSTRUCTIONS.to_string(),
             apply_patch_tool_type: Some(ApplyPatchToolType::Freeform),
             shell_type: ConfigShellToolType::ShellCommand,
             supports_parallel_tool_calls: true,
@@ -202,7 +202,7 @@ pub fn find_family_for_model(slug: &str) -> Option<ModelFamily> {
             support_verbosity: false,
             truncation_policy: TruncationPolicy::Tokens(10_000),
         )
-    } else if slug.starts_with("arcticfox") {
+    } else if slug.starts_with("gpt-5.1-codex-max") {
         model_family!(
             slug, slug,
             supports_reasoning_summaries: true,

codex-rs/core/src/openai_model_info.rs

@@ -72,7 +72,7 @@ pub(crate) fn get_model_info(model_family: &ModelFamily) -> Option<ModelInfo> {
 
         _ if slug.starts_with("gpt-5-codex")
             || slug.starts_with("gpt-5.1-codex")
-            || slug.starts_with("arcticfox") =>
+            || slug.starts_with("gpt-5.1-codex-max") =>
         {
             Some(ModelInfo::new(CONTEXT_WINDOW_272K, MAX_OUTPUT_TOKENS_128K))
         }