From 58d253231d83f669a2cdfefa5fe479751d22c582 Mon Sep 17 00:00:00 2001
From: luke <97411838+luke2x@users.noreply.github.com>
Date: Mon, 12 Oct 2026 09:13:54 +0100
Subject: [PATCH] fix(web): context meter no longer reads 1000k just under a
 million tokens (#17539)

---
 apps/web/src/lib/contextWindow.test.ts | 10 ++++++++++
 apps/web/src/lib/contextWindow.ts      |  3 ++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/apps/web/src/lib/contextWindow.test.ts b/apps/web/src/lib/contextWindow.test.ts
index 24adda08ae1736b54c424d62f4e6f60b4db10d87..2847b23cab779ef61c2a960325cc3bbb4475906d 100644
--- a/apps/web/src/lib/contextWindow.test.ts
+++ b/apps/web/src/lib/contextWindow.test.ts
@@ -58,6 +58,16 @@ describe("V2 context window presentation", () => {
   it("formats compact token values", () => {
     expect(formatContextWindowTokens(1_500)).toBe("1.5k");
   });
+
+  it.each([
+    [999_499, "999k"],
+    [999_500, "1m"],
+    [999_999, "1m"],
+    [1_000_000, "1m"],
+    [1_100_000, "1.1m"],
+  ])("formats %d tokens as %s at the million boundary", (tokens, expected) => {
+    expect(formatContextWindowTokens(tokens)).toBe(expected);
+  });
 });
 
 describe("live provider-turn usage (#8144)", () => {
diff --git a/apps/web/src/lib/contextWindow.ts b/apps/web/src/lib/contextWindow.ts
index d06141b0e84ee558cd4f01c3535ab29aa1eab2b3..33f59c3eab493e4a8c9946fb21e519391096a474 100644
--- a/apps/web/src/lib/contextWindow.ts
+++ b/apps/web/src/lib/contextWindow.ts
@@ -171,7 +171,8 @@ export function formatContextWindowTokens(value: number | null): string {
   if (value < 10_000) {
     return `${(value / 1_000).toFixed(1).replace(/\.0$/, "")}k`;
   }
-  if (value < 1_000_000) {
+  // Anything from 999,500 rounds to 1000k, so it belongs to the next unit.
+  if (value < 999_500) {
     return `${Math.round(value / 1_000)}k`;
   }
   return `${(value / 1_000_000).toFixed(1).replace(/\.0$/, "")}m`;
-- 
2.54.0