Add capacity error (#1947)

codex-rs/core/src/client.rs

@@ -271,6 +271,10 @@ impl ModelClient {
                     }
 
                     if attempt > max_retries {
+                        if status == StatusCode::INTERNAL_SERVER_ERROR {
+                            return Err(CodexErr::InternalServerError);
+                        }
+
                         return Err(CodexErr::RetryLimit(status));
                     }
 

codex-rs/core/src/error.rs

@@ -68,6 +68,11 @@ pub enum CodexErr {
     #[error("Usage not included with the plan")]
     UsageNotIncluded,
 
+    #[error(
+        "We’re currently experiencing high demand, which may cause temporary errors. We’re adding capacity in East and West Europe to restore normal service."
+    )]
+    InternalServerError,
+
     /// Retry limit exceeded.
     #[error("exceeded retry limit, last status: {0}")]
     RetryLimit(StatusCode),