diff --git a/codex-rs/core/src/codex.rs b/codex-rs/core/src/codex.rs
index ebbb00788..8175adcbc 100644
--- a/codex-rs/core/src/codex.rs
+++ b/codex-rs/core/src/codex.rs
@@ -649,7 +649,7 @@ impl Session {
         );
         config.features.emit_metrics(&otel_manager);
         otel_manager.counter(
-            "codex.session.started",
+            "codex.thread.started",
             1,
             &[(
                 "is_git",