diff --git a/changelog/4522.changed.md b/changelog/4522.changed.md
new file mode 100644
index 000000000..37156adc7
--- /dev/null
+++ b/changelog/4522.changed.md
@@ -0,0 +1 @@
+- Updated the default p99 TTFS latency values for Smallest AI, Mistral, and XAI STT so turn stop timing uses measured values instead of the conservative fallback.