From 3b93cbd5716730e8cd2eab2e7dfc472dcdef0980 Mon Sep 17 00:00:00 2001
From: Tom Wiltzius <wiltzius@openai.com>
Date: Thu, 9 Jul 2026 20:54:51 -0700
Subject: [PATCH] codex: preserve TBT clamp without rounding (#31688)

---
 codex-rs/otel/src/events/session_telemetry.rs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/codex-rs/otel/src/events/session_telemetry.rs b/codex-rs/otel/src/events/session_telemetry.rs
index e487998cd2..6d7afb72e3 100644
--- a/codex-rs/otel/src/events/session_telemetry.rs
+++ b/codex-rs/otel/src/events/session_telemetry.rs
@@ -1254,8 +1254,7 @@ impl SessionTelemetry {
 
 fn duration_from_ms_value(value: Option<&serde_json::Value>) -> Option<Duration> {
     let ms = f64_ms_value(value)?;
-    let clamped = ms.min(u64::MAX as f64);
-    Some(Duration::from_millis(clamped.round() as u64))
+    Some(Duration::from_millis(ms.round() as u64))
 }
 
 fn f64_ms_value(value: Option<&serde_json::Value>) -> Option<f64> {
@@ -1267,5 +1266,5 @@ fn f64_ms_value(value: Option<&serde_json::Value>) -> Option<f64> {
     if !ms.is_finite() || ms < 0.0 {
         return None;
     }
-    Some(ms)
+    Some(ms.min(u64::MAX as f64))
 }