diff --git a/codex-rs/core/src/config/mod.rs b/codex-rs/core/src/config/mod.rs
index 02fc0121f6f..ca3ccc1ffd0 100644
--- a/codex-rs/core/src/config/mod.rs
+++ b/codex-rs/core/src/config/mod.rs
@@ -89,7 +89,7 @@ pub use codex_git::GhostSnapshotConfig;
 /// files are *silently truncated* to this size so we do not take up too much of
 /// the context window.
 pub(crate) const PROJECT_DOC_MAX_BYTES: usize = 32 * 1024; // 32 KiB
-pub(crate) const DEFAULT_AGENT_MAX_THREADS: Option<usize> = Some(12);
+pub(crate) const DEFAULT_AGENT_MAX_THREADS: Option<usize> = Some(6);
 
 pub const CONFIG_TOML_FILE: &str = "config.toml";