diff --git a/codex-rs/core/src/codex.rs b/codex-rs/core/src/codex.rs
index 808ff43b4..93f87e5c4 100644
--- a/codex-rs/core/src/codex.rs
+++ b/codex-rs/core/src/codex.rs
@@ -981,6 +981,7 @@ impl Session {
             auth.and_then(CodexAuth::get_account_id),
             auth.and_then(CodexAuth::get_account_email),
             auth_mode,
+            crate::default_client::originator().value,
             config.otel.log_user_prompt,
             terminal::user_agent(),
             session_configuration.session_source.clone(),
@@ -5775,6 +5776,7 @@ mod tests {
             None,
             Some("test@test.com".to_string()),
             Some(TelemetryAuthMode::Chatgpt),
+            "test_originator".to_string(),
             false,
             "test".to_string(),
             session_source,
diff --git a/codex-rs/core/tests/responses_headers.rs b/codex-rs/core/tests/responses_headers.rs
index be8a93b0c..ecd353a20 100644
--- a/codex-rs/core/tests/responses_headers.rs
+++ b/codex-rs/core/tests/responses_headers.rs
@@ -80,6 +80,7 @@ async fn responses_stream_includes_subagent_header_on_review() {
         None,
         Some("test@test.com".to_string()),
         Some(auth_mode),
+        "test_originator".to_string(),
         false,
         "test".to_string(),
         session_source.clone(),
@@ -183,6 +184,7 @@ async fn responses_stream_includes_subagent_header_on_other() {
         None,
         Some("test@test.com".to_string()),
         Some(auth_mode),
+        "test_originator".to_string(),
         false,
         "test".to_string(),
         session_source.clone(),
@@ -285,6 +287,7 @@ async fn responses_respects_model_info_overrides_from_config() {
         None,
         Some("test@test.com".to_string()),
         auth_mode,
+        "test_originator".to_string(),
         false,
         "test".to_string(),
         session_source.clone(),
diff --git a/codex-rs/core/tests/suite/client.rs b/codex-rs/core/tests/suite/client.rs
index 46a51fe70..2b7753c29 100644
--- a/codex-rs/core/tests/suite/client.rs
+++ b/codex-rs/core/tests/suite/client.rs
@@ -1259,6 +1259,7 @@ async fn azure_responses_request_includes_store_and_reasoning_ids() {
         None,
         Some("test@test.com".to_string()),
         auth_manager.auth_mode().map(TelemetryAuthMode::from),
+        "test_originator".to_string(),
         false,
         "test".to_string(),
         SessionSource::Exec,
diff --git a/codex-rs/core/tests/suite/client_websockets.rs b/codex-rs/core/tests/suite/client_websockets.rs
index 125de9dfc..a3810a2a3 100644
--- a/codex-rs/core/tests/suite/client_websockets.rs
+++ b/codex-rs/core/tests/suite/client_websockets.rs
@@ -702,6 +702,7 @@ async fn websocket_harness_with_options(
         None,
         Some("test@test.com".to_string()),
         auth_manager.auth_mode().map(TelemetryAuthMode::from),
+        "test_originator".to_string(),
         false,
         "test".to_string(),
         SessionSource::Exec,
diff --git a/codex-rs/otel/src/lib.rs b/codex-rs/otel/src/lib.rs
index a86e5ef52..cbedc4836 100644
--- a/codex-rs/otel/src/lib.rs
+++ b/codex-rs/otel/src/lib.rs
@@ -44,6 +44,7 @@ pub struct OtelEventMetadata {
     pub(crate) auth_mode: Option<String>,
     pub(crate) account_id: Option<String>,
     pub(crate) account_email: Option<String>,
+    pub(crate) originator: String,
     pub(crate) session_source: String,
     pub(crate) model: String,
     pub(crate) slug: String,
diff --git a/codex-rs/otel/src/traces/otel_manager.rs b/codex-rs/otel/src/traces/otel_manager.rs
index c54c64c6c..8c0f5d295 100644
--- a/codex-rs/otel/src/traces/otel_manager.rs
+++ b/codex-rs/otel/src/traces/otel_manager.rs
@@ -66,6 +66,7 @@ impl OtelManager {
         account_id: Option<String>,
         account_email: Option<String>,
         auth_mode: Option<TelemetryAuthMode>,
+        originator: String,
         log_user_prompts: bool,
         terminal_type: String,
         session_source: SessionSource,
@@ -76,6 +77,7 @@ impl OtelManager {
                 auth_mode: auth_mode.map(|m| m.to_string()),
                 account_id,
                 account_email,
+                originator,
                 session_source: session_source.to_string(),
                 model: model.to_owned(),
                 slug: slug.to_owned(),
@@ -134,6 +136,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -198,6 +201,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -229,6 +233,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -330,6 +335,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -407,6 +413,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -440,6 +447,7 @@ impl OtelManager {
                 conversation.id = %self.metadata.conversation_id,
                 app.version = %self.metadata.app_version,
                 auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
                 user.account_id = self.metadata.account_id,
                 user.email = self.metadata.account_email,
                 terminal.type = %self.metadata.terminal_type,
@@ -455,6 +463,7 @@ impl OtelManager {
                 conversation.id = %self.metadata.conversation_id,
                 app.version = %self.metadata.app_version,
                 auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
                 user.account_id = self.metadata.account_id,
                 user.email = self.metadata.account_email,
                 terminal.type = %self.metadata.terminal_type,
@@ -478,6 +487,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -503,6 +513,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -538,6 +549,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -562,6 +574,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -617,6 +630,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
@@ -654,6 +668,7 @@ impl OtelManager {
             conversation.id = %self.metadata.conversation_id,
             app.version = %self.metadata.app_version,
             auth_mode = self.metadata.auth_mode,
+            originator = %self.metadata.originator,
             user.account_id = self.metadata.account_id,
             user.email = self.metadata.account_email,
             terminal.type = %self.metadata.terminal_type,
diff --git a/codex-rs/otel/tests/suite/manager_metrics.rs b/codex-rs/otel/tests/suite/manager_metrics.rs
index 164bb43b3..3dbc33441 100644
--- a/codex-rs/otel/tests/suite/manager_metrics.rs
+++ b/codex-rs/otel/tests/suite/manager_metrics.rs
@@ -23,6 +23,7 @@ fn manager_attaches_metadata_tags_to_metrics() -> Result<()> {
         Some("account-id".to_string()),
         None,
         Some(TelemetryAuthMode::ApiKey),
+        "test_originator".to_string(),
         true,
         "tty".to_string(),
         SessionSource::Cli,
@@ -77,6 +78,7 @@ fn manager_allows_disabling_metadata_tags() -> Result<()> {
         Some("account-id".to_string()),
         None,
         Some(TelemetryAuthMode::ApiKey),
+        "test_originator".to_string(),
         true,
         "tty".to_string(),
         SessionSource::Cli,
diff --git a/codex-rs/otel/tests/suite/runtime_summary.rs b/codex-rs/otel/tests/suite/runtime_summary.rs
index 79c6b258e..0737e0797 100644
--- a/codex-rs/otel/tests/suite/runtime_summary.rs
+++ b/codex-rs/otel/tests/suite/runtime_summary.rs
@@ -27,6 +27,7 @@ fn runtime_metrics_summary_collects_tool_api_and_streaming_metrics() -> Result<(
         Some("account-id".to_string()),
         None,
         Some(TelemetryAuthMode::ApiKey),
+        "test_originator".to_string(),
         true,
         "tty".to_string(),
         SessionSource::Cli,
diff --git a/codex-rs/otel/tests/suite/snapshot.rs b/codex-rs/otel/tests/suite/snapshot.rs
index aa7990d06..0c6ef7e91 100644
--- a/codex-rs/otel/tests/suite/snapshot.rs
+++ b/codex-rs/otel/tests/suite/snapshot.rs
@@ -76,6 +76,7 @@ fn manager_snapshot_metrics_collects_without_shutdown() -> Result<()> {
         Some("account-id".to_string()),
         None,
         Some(TelemetryAuthMode::ApiKey),
+        "test_originator".to_string(),
         true,
         "tty".to_string(),
         SessionSource::Cli,
diff --git a/codex-rs/tui/src/app.rs b/codex-rs/tui/src/app.rs
index 718615237..ea41749e9 100644
--- a/codex-rs/tui/src/app.rs
+++ b/codex-rs/tui/src/app.rs
@@ -986,6 +986,7 @@ impl App {
             auth_ref.and_then(CodexAuth::get_account_id),
             auth_ref.and_then(CodexAuth::get_account_email),
             auth_mode,
+            codex_core::default_client::originator().value,
             config.otel.log_user_prompt,
             codex_core::terminal::user_agent(),
             SessionSource::Cli,
@@ -2789,6 +2790,7 @@ mod tests {
             None,
             None,
             None,
+            "test_originator".to_string(),
             false,
             "test".to_string(),
             SessionSource::Cli,
diff --git a/codex-rs/tui/src/chatwidget/tests.rs b/codex-rs/tui/src/chatwidget/tests.rs
index 6d7df4411..7610d2075 100644
--- a/codex-rs/tui/src/chatwidget/tests.rs
+++ b/codex-rs/tui/src/chatwidget/tests.rs
@@ -896,6 +896,7 @@ fn test_otel_manager(config: &Config, model: &str) -> OtelManager {
         None,
         None,
         None,
+        "test_originator".to_string(),
         false,
         "test".to_string(),
         SessionSource::Cli,