[codex] move configuration for reasoning summary format to model family config type (#3171)

codex-rs/core/src/config.rs

@@ -1,6 +1,7 @@
 use crate::config_profile::ConfigProfile;
 use crate::config_types::History;
 use crate::config_types::McpServerConfig;
+use crate::config_types::ReasoningSummaryFormat;
 use crate::config_types::SandboxWorkspaceWrite;
 use crate::config_types::ShellEnvironmentPolicy;
 use crate::config_types::ShellEnvironmentPolicyToml;
@@ -185,8 +186,6 @@ pub struct Config {
     /// All characters are inserted as they are received, and no buffering
     /// or placeholder replacement will occur for fast keypress bursts.
     pub disable_paste_burst: bool,
-
-    pub use_experimental_reasoning_summary: bool,
 }
 
 impl Config {
@@ -473,6 +472,9 @@ pub struct ConfigToml {
     /// Override to force-enable reasoning summaries for the configured model.
     pub model_supports_reasoning_summaries: Option<bool>,
 
+    /// Override to force reasoning summary format for the configured model.
+    pub model_reasoning_summary_format: Option<ReasoningSummaryFormat>,
+
     /// Base URL for requests to ChatGPT (as opposed to the OpenAI API).
     pub chatgpt_base_url: Option<String>,
 
@@ -484,8 +486,6 @@ pub struct ConfigToml {
 
     pub experimental_use_exec_command_tool: Option<bool>,
 
-    pub use_experimental_reasoning_summary: Option<bool>,
-
     /// The value for the `originator` header included with Responses API requests.
     pub responses_originator_header_internal_override: Option<String>,
 
@@ -713,11 +713,15 @@ impl Config {
         let model_family = find_family_for_model(&model).unwrap_or_else(|| {
             let supports_reasoning_summaries =
                 cfg.model_supports_reasoning_summaries.unwrap_or(false);
+            let reasoning_summary_format = cfg
+                .model_reasoning_summary_format
+                .unwrap_or(ReasoningSummaryFormat::None);
             ModelFamily {
                 slug: model.clone(),
                 family: model.clone(),
                 needs_special_apply_patch_instructions: false,
                 supports_reasoning_summaries,
+                reasoning_summary_format,
                 uses_local_shell_tool: false,
                 apply_patch_tool_type: None,
             }
@@ -811,9 +815,6 @@ impl Config {
                 .unwrap_or(false),
             include_view_image_tool,
             disable_paste_burst: cfg.disable_paste_burst.unwrap_or(false),
-            use_experimental_reasoning_summary: cfg
-                .use_experimental_reasoning_summary
-                .unwrap_or(false),
         };
         Ok(config)
     }
@@ -1192,7 +1193,6 @@ model_verbosity = "high"
                 use_experimental_streamable_shell_tool: false,
                 include_view_image_tool: true,
                 disable_paste_burst: false,
-                use_experimental_reasoning_summary: false,
             },
             o3_profile_config
         );
@@ -1251,7 +1251,6 @@ model_verbosity = "high"
             use_experimental_streamable_shell_tool: false,
             include_view_image_tool: true,
             disable_paste_burst: false,
-            use_experimental_reasoning_summary: false,
         };
 
         assert_eq!(expected_gpt3_profile_config, gpt3_profile_config);
@@ -1325,7 +1324,6 @@ model_verbosity = "high"
             use_experimental_streamable_shell_tool: false,
             include_view_image_tool: true,
             disable_paste_burst: false,
-            use_experimental_reasoning_summary: false,
         };
 
         assert_eq!(expected_zdr_profile_config, zdr_profile_config);
@@ -1385,7 +1383,6 @@ model_verbosity = "high"
             use_experimental_streamable_shell_tool: false,
             include_view_image_tool: true,
             disable_paste_burst: false,
-            use_experimental_reasoning_summary: false,
         };
 
         assert_eq!(expected_gpt5_profile_config, gpt5_profile_config);

codex-rs/core/src/config_types.rs

@@ -183,3 +183,11 @@ impl From<ShellEnvironmentPolicyToml> for ShellEnvironmentPolicy {
         }
     }
 }
+
+#[derive(Deserialize, Debug, Clone, PartialEq, Eq, Default, Hash)]
+#[serde(rename_all = "kebab-case")]
+pub enum ReasoningSummaryFormat {
+    #[default]
+    None,
+    Experimental,
+}

codex-rs/core/src/model_family.rs

@@ -1,3 +1,4 @@
+use crate::config_types::ReasoningSummaryFormat;
 use crate::tool_apply_patch::ApplyPatchToolType;
 
 /// A model family is a group of models that share certain characteristics.
@@ -20,6 +21,9 @@ pub struct ModelFamily {
     // `summary` is optional).
     pub supports_reasoning_summaries: bool,
 
+    // Define if we need a special handling of reasoning summary
+    pub reasoning_summary_format: ReasoningSummaryFormat,
+
     // This should be set to true when the model expects a tool named
     // "local_shell" to be provided. Its contract must be understood natively by
     // the model such that its description can be omitted.
@@ -41,6 +45,7 @@ macro_rules! model_family {
             family: $family.to_string(),
             needs_special_apply_patch_instructions: false,
             supports_reasoning_summaries: false,
+            reasoning_summary_format: ReasoningSummaryFormat::None,
             uses_local_shell_tool: false,
             apply_patch_tool_type: None,
         };
@@ -61,6 +66,7 @@ macro_rules! simple_model_family {
             family: $family.to_string(),
             needs_special_apply_patch_instructions: false,
             supports_reasoning_summaries: false,
+            reasoning_summary_format: ReasoningSummaryFormat::None,
             uses_local_shell_tool: false,
             apply_patch_tool_type: None,
         })
@@ -90,6 +96,7 @@ pub fn find_family_for_model(slug: &str) -> Option<ModelFamily> {
         model_family!(
             slug, slug,
             supports_reasoning_summaries: true,
+            reasoning_summary_format: ReasoningSummaryFormat::Experimental,
         )
     } else if slug.starts_with("gpt-4.1") {
         model_family!(