diff --git a/codex-rs/analytics/src/analytics_client_tests.rs b/codex-rs/analytics/src/analytics_client_tests.rs
index ef5051caba..cabea80886 100644
--- a/codex-rs/analytics/src/analytics_client_tests.rs
+++ b/codex-rs/analytics/src/analytics_client_tests.rs
@@ -1262,6 +1262,14 @@ fn compaction_event_serializes_expected_shape() {
     );
 }
 
+#[test]
+fn compaction_implementation_serializes_remote_v2() {
+    let payload = serde_json::to_value(CompactionImplementation::ResponsesCompactionV2)
+        .expect("serialize compaction implementation");
+
+    assert_eq!(payload, json!("responses_compaction_v2"));
+}
+
 #[test]
 fn app_used_dedupe_is_keyed_by_turn_and_connector() {
     let (sender, _receiver) = mpsc::channel(1);
diff --git a/codex-rs/analytics/src/facts.rs b/codex-rs/analytics/src/facts.rs
index d7e2c069d6..56bd0a5d2c 100644
--- a/codex-rs/analytics/src/facts.rs
+++ b/codex-rs/analytics/src/facts.rs
@@ -229,6 +229,7 @@ pub enum CompactionReason {
 #[serde(rename_all = "snake_case")]
 pub enum CompactionImplementation {
     Responses,
+    ResponsesCompactionV2,
     ResponsesCompact,
 }
 
diff --git a/codex-rs/core/src/compact_remote_v2.rs b/codex-rs/core/src/compact_remote_v2.rs
index 37e44021bc..0e235a941f 100644
--- a/codex-rs/core/src/compact_remote_v2.rs
+++ b/codex-rs/core/src/compact_remote_v2.rs
@@ -111,7 +111,7 @@ async fn run_remote_compact_task_inner(
         turn_context.as_ref(),
         trigger,
         reason,
-        CompactionImplementation::Responses,
+        CompactionImplementation::ResponsesCompactionV2,
         phase,
     )
     .await;