diff --git a/packages/ui/src/components/basic-tool.css b/packages/ui/src/components/basic-tool.css
index 9ff64736a..ad25bef32 100644
--- a/packages/ui/src/components/basic-tool.css
+++ b/packages/ui/src/components/basic-tool.css
@@ -64,6 +64,7 @@
     overflow: clip;
     white-space: nowrap;
     font-family: var(--font-family-sans);
+    font-variant-numeric: tabular-nums;
     font-size: 14px;
     font-style: normal;
     font-weight: var(--font-weight-regular);
@@ -108,6 +109,7 @@
     overflow: clip;
     white-space: nowrap;
     font-family: var(--font-family-sans);
+    font-variant-numeric: tabular-nums;
     font-size: 14px;
     font-style: normal;
     font-weight: var(--font-weight-regular);
diff --git a/packages/ui/src/components/session-turn.css b/packages/ui/src/components/session-turn.css
index 2f19d20e6..56e060633 100644
--- a/packages/ui/src/components/session-turn.css
+++ b/packages/ui/src/components/session-turn.css
@@ -230,6 +230,7 @@
   [data-slot="session-turn-diffs-count"] {
     color: var(--text-base);
     font-family: var(--font-family-sans);
+    font-variant-numeric: tabular-nums;
     font-size: var(--font-size-base);
     font-weight: var(--font-weight-regular);
     line-height: var(--line-height-large);