diff --git a/codex-rs/README.md b/codex-rs/README.md
index a0e3f5846e0..a26f5b6d1da 100644
--- a/codex-rs/README.md
+++ b/codex-rs/README.md
@@ -32,7 +32,7 @@ The `config.toml` file supports the following options:
 The model that Codex should use.
 
 ```toml
-model = "o3"  # overrides the default of "o4-mini"
+model = "o3"  # overrides the default of "codex-mini-latest"
 ```
 
 ### model_provider
@@ -155,7 +155,7 @@ Users can specify config values at multiple levels. Order of precedence is as fo
 1. custom command-line argument, e.g., `--model o3`
 2. as part of a profile, where the `--profile` is specified via a CLI (or in the config file itself)
 3. as an entry in `config.toml`, e.g., `model = "o3"`
-4. the default value that comes with Codex CLI (i.e., Codex CLI defaults to `o4-mini`)
+4. the default value that comes with Codex CLI (i.e., Codex CLI defaults to `codex-mini-latest`)
 
 ### sandbox_permissions
 
diff --git a/codex-rs/common/src/config_override.rs b/codex-rs/common/src/config_override.rs
index bd2c0369407..610195d6d10 100644
--- a/codex-rs/common/src/config_override.rs
+++ b/codex-rs/common/src/config_override.rs
@@ -23,7 +23,7 @@ pub struct CliConfigOverrides {
     /// parse as JSON, the raw string is used as a literal.
     ///
     /// Examples:
-    ///   - `-c model="o4-mini"`
+    ///   - `-c model="o3"`
     ///   - `-c 'sandbox_permissions=["disk-full-read-access"]'`
     ///   - `-c shell_environment_policy.inherit=all`
     #[arg(
@@ -61,7 +61,7 @@ impl CliConfigOverrides {
 
                 // Attempt to parse as JSON. If that fails, treat it as a raw
                 // string. This allows convenient usage such as
-                // `-c model=o4-mini` without the quotes.
+                // `-c model=o3` without the quotes.
                 let value: Value = match parse_toml_value(value_str) {
                     Ok(v) => v,
                     Err(_) => Value::String(value_str.to_string()),
diff --git a/codex-rs/core/src/flags.rs b/codex-rs/core/src/flags.rs
index e8cc973c993..c21ef670262 100644
--- a/codex-rs/core/src/flags.rs
+++ b/codex-rs/core/src/flags.rs
@@ -3,7 +3,7 @@ use std::time::Duration;
 use env_flags::env_flags;
 
 env_flags! {
-    pub OPENAI_DEFAULT_MODEL: &str = "o4-mini";
+    pub OPENAI_DEFAULT_MODEL: &str = "codex-mini-latest";
     pub OPENAI_API_BASE: &str = "https://api.openai.com/v1";
 
     /// Fallback when the provider-specific key is not set.
diff --git a/codex-rs/core/src/protocol.rs b/codex-rs/core/src/protocol.rs
index 1b9871edd89..fc18f1d8212 100644
--- a/codex-rs/core/src/protocol.rs
+++ b/codex-rs/core/src/protocol.rs
@@ -561,7 +561,7 @@ mod tests {
             id: "1234".to_string(),
             msg: EventMsg::SessionConfigured(SessionConfiguredEvent {
                 session_id,
-                model: "o4-mini".to_string(),
+                model: "codex-mini-latest".to_string(),
                 history_log_id: 0,
                 history_entry_count: 0,
             }),
@@ -569,7 +569,7 @@ mod tests {
         let serialized = serde_json::to_string(&event).unwrap();
         assert_eq!(
             serialized,
-            r#"{"id":"1234","msg":{"type":"session_configured","session_id":"67e55044-10b1-426f-9247-bb680e5fe0c8","model":"o4-mini","history_log_id":0,"history_entry_count":0}}"#
+            r#"{"id":"1234","msg":{"type":"session_configured","session_id":"67e55044-10b1-426f-9247-bb680e5fe0c8","model":"codex-mini-latest","history_log_id":0,"history_entry_count":0}}"#
         );
     }
 }