diff --git a/codex-rs/core/src/client.rs b/codex-rs/core/src/client.rs
index ed05fb5d..0fa143fd 100644
--- a/codex-rs/core/src/client.rs
+++ b/codex-rs/core/src/client.rs
@@ -127,6 +127,15 @@ impl ModelClient {
 
         let auth_mode = auth.as_ref().map(|a| a.mode);
 
+        if self.config.model_family.family == "2025-08-06-model"
+            && auth_mode != Some(AuthMode::ChatGPT)
+        {
+            return Err(CodexErr::UnexpectedStatus(
+                StatusCode::BAD_REQUEST,
+                "2025-08-06-model is only supported with ChatGPT auth, run `codex login status` to check your auth status and `codex login` to login with ChatGPT".to_string(),
+            ));
+        }
+
         let store = prompt.store && auth_mode != Some(AuthMode::ChatGPT);
 
         let full_instructions = prompt.get_full_instructions(&self.config.model_family);
diff --git a/codex-rs/core/src/model_family.rs b/codex-rs/core/src/model_family.rs
index 7c4a9de6..cadbceca 100644
--- a/codex-rs/core/src/model_family.rs
+++ b/codex-rs/core/src/model_family.rs
@@ -89,6 +89,11 @@ pub fn find_family_for_model(slug: &str) -> Option<ModelFamily> {
         simple_model_family!(slug, "gpt-oss")
     } else if slug.starts_with("gpt-3.5") {
         simple_model_family!(slug, "gpt-3.5")
+    } else if slug.starts_with("2025-08-06-model") {
+        model_family!(
+            slug, "2025-08-06-model",
+            supports_reasoning_summaries: true,
+        )
     } else {
         None
     }
diff --git a/codex-rs/core/src/openai_model_info.rs b/codex-rs/core/src/openai_model_info.rs
index 935eb8be..0ce94267 100644
--- a/codex-rs/core/src/openai_model_info.rs
+++ b/codex-rs/core/src/openai_model_info.rs
@@ -77,6 +77,11 @@ pub(crate) fn get_model_info(model_family: &ModelFamily) -> Option<ModelInfo> {
             max_output_tokens: 4_096,
         }),
 
+        "2025-08-06-model" => Some(ModelInfo {
+            context_window: 200_000,
+            max_output_tokens: 100_000,
+        }),
+
         _ => None,
     }
 }