diff --git a/codex-rs/core/src/models_manager/manager.rs b/codex-rs/core/src/models_manager/manager.rs
index 8b484ec847..aeb4488bb8 100644
--- a/codex-rs/core/src/models_manager/manager.rs
+++ b/codex-rs/core/src/models_manager/manager.rs
@@ -150,7 +150,11 @@ impl ModelsManager {
             .await
             .into_iter()
             .find(|m| m.slug == model);
-        let model = remote.unwrap_or(local);
+        let remote_supports = remote.as_ref().is_some_and(ModelInfo::supports_personality);
+        let mut model = remote.unwrap_or(local);
+        if !remote_supports {
+            model.model_instructions_template = None;
+        }
         model_info::with_config_overrides(model, config)
     }
 
@@ -353,7 +357,10 @@ impl ModelsManager {
     #[cfg(any(test, feature = "test-support"))]
     /// Build `ModelInfo` without consulting remote state or cache.
     pub fn construct_model_info_offline(model: &str, config: &Config) -> ModelInfo {
-        model_info::with_config_overrides(model_info::find_model_info_for_slug(model), config)
+        let mut model_info =
+            model_info::with_config_overrides(model_info::find_model_info_for_slug(model), config);
+        model_info.model_instructions_template = None;
+        model_info
     }
 }
 
diff --git a/codex-rs/core/src/models_manager/model_info.rs b/codex-rs/core/src/models_manager/model_info.rs
index 8f2f853d81..c07c144c11 100644
--- a/codex-rs/core/src/models_manager/model_info.rs
+++ b/codex-rs/core/src/models_manager/model_info.rs
@@ -1,8 +1,13 @@
+use std::collections::BTreeMap;
+
+use codex_protocol::config_types::Personality;
 use codex_protocol::config_types::Verbosity;
 use codex_protocol::openai_models::ApplyPatchToolType;
 use codex_protocol::openai_models::ConfigShellToolType;
 use codex_protocol::openai_models::ModelInfo;
+use codex_protocol::openai_models::ModelInstructionsTemplate;
 use codex_protocol::openai_models::ModelVisibility;
+use codex_protocol::openai_models::PersonalityMessages;
 use codex_protocol::openai_models::ReasoningEffort;
 use codex_protocol::openai_models::ReasoningEffortPreset;
 use codex_protocol::openai_models::TruncationMode;
@@ -22,6 +27,10 @@ const GPT_5_2_INSTRUCTIONS: &str = include_str!("../../gpt_5_2_prompt.md");
 const GPT_5_1_CODEX_MAX_INSTRUCTIONS: &str = include_str!("../../gpt-5.1-codex-max_prompt.md");
 
 const GPT_5_2_CODEX_INSTRUCTIONS: &str = include_str!("../../gpt-5.2-codex_prompt.md");
+const GPT_5_2_CODEX_INSTRUCTIONS_TEMPLATE: &str =
+    include_str!("../../templates/model_instructions/gpt-5.2-codex_instructions_template.md");
+const PERSONALITY_FRIENDLY: &str = include_str!("../../templates/personalities/friendly.md");
+const PERSONALITY_PRAGMATIC: &str = include_str!("../../templates/personalities/pragmatic.md");
 
 pub(crate) const CONTEXT_WINDOW_272K: i64 = 272_000;
 
@@ -160,6 +169,16 @@ pub(crate) fn find_model_info_for_slug(slug: &str) -> ModelInfo {
         model_info!(
             slug,
             base_instructions: GPT_5_2_CODEX_INSTRUCTIONS.to_string(),
+            model_instructions_template: Some(ModelInstructionsTemplate {
+                template: GPT_5_2_CODEX_INSTRUCTIONS_TEMPLATE.to_string(),
+                personality_messages: Some(PersonalityMessages(BTreeMap::from([(
+                    Personality::Friendly,
+                    PERSONALITY_FRIENDLY.to_string(),
+                ), (
+                    Personality::Pragmatic,
+                    PERSONALITY_PRAGMATIC.to_string(),
+                )]))),
+            }),
             apply_patch_tool_type: Some(ApplyPatchToolType::Freeform),
             shell_type: ConfigShellToolType::ShellCommand,
             supports_parallel_tool_calls: true,