diff --git a/codex-rs/core/src/tools/handlers/agent_jobs.rs b/codex-rs/core/src/tools/handlers/agent_jobs.rs
index ca62bde6f1..09d3ea1657 100644
--- a/codex-rs/core/src/tools/handlers/agent_jobs.rs
+++ b/codex-rs/core/src/tools/handlers/agent_jobs.rs
@@ -583,7 +583,7 @@ async fn build_runner_options(
 }
 
 fn normalize_concurrency(requested: Option<usize>, max_threads: Option<usize>) -> usize {
-    let requested = requested.unwrap_or(4).max(1);
+    let requested = requested.unwrap_or(64).max(1);
     let requested = requested.min(64);
     if let Some(max_threads) = max_threads {
         requested.min(max_threads.max(1))
diff --git a/codex-rs/docs/agent_jobs.md b/codex-rs/docs/agent_jobs.md
index 00f656b585..8a7f1c9516 100644
--- a/codex-rs/docs/agent_jobs.md
+++ b/codex-rs/docs/agent_jobs.md
@@ -25,7 +25,7 @@ Optional args:
 - `job_name`: human-friendly label.
 - `output_csv_path`: destination for CSV export (defaults to `<input>.agent-job-<id>.csv`).
 - `output_schema`: JSON schema for result payloads (best-effort guidance).
-- `max_concurrency`: cap on parallel workers.
+- `max_concurrency`: cap on parallel workers (defaults to 64, then capped by config).
 - `auto_export`: auto-export CSV on successful completion (default true).
 
 ### `run_agent_job`