diff --git a/webui/__snapshots__/web-components/sketch-app-shell.test.ts-snapshots/sketch-app-shell-basic.aria.yml b/webui/__snapshots__/web-components/sketch-app-shell.test.ts-snapshots/sketch-app-shell-basic.aria.yml
index 439bc19..2c109f0 100644
--- a/webui/__snapshots__/web-components/sketch-app-shell.test.ts-snapshots/sketch-app-shell-basic.aria.yml
+++ b/webui/__snapshots__/web-components/sketch-app-shell.test.ts-snapshots/sketch-app-shell-basic.aria.yml
@@ -2,7 +2,7 @@
 - heading "Add a line to dummy.txt and commit the change" [level=2]
 - link "Logs"
 - link "Download"
-- text: "/MacBook-Pro-9\\.local \\/Users\\/pokey\\/src\\/spaghetti Origin: git@github\\.com:pokey\\/spaghetti\\.git Commit: a6c5a08a Msgs: \\d+ Input tokens: \\d+ Output tokens: \\d+ Cost: \\$\\d+\\.\\d+/"
+- text: "/MacBook-Pro-9\\.local \\/Users\\/pokey\\/src\\/spaghetti Origin: git@github\\.com:pokey\\/spaghetti\\.git Commit: a6c5a08a Msgs: \\d+ Input tokens: \\d+(,\\d+)* Output tokens: \\d+(,\\d+)* Cost: \\$\\d+\\.\\d+/"
 - button "💬"
 - button "±"
 - button "📈"
@@ -12,17 +12,17 @@
 - text: /Poll Invalid response from server - not connected U user Apr \d+, \d+, \d+:\d+:\d+ AM/
 - button "Copy"
 - paragraph: add a line to dummy.txt. Doesn't matter what it is and don't bother running tests it's just a dummy repo. Please commit afterward
-- text: "/A agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+ Out: \\d+ \\(\\$\\d+\\.\\d+\\)/"
+- text: "/A agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+(,\\d+)* Out: \\d+(,\\d+)* \\(\\$\\d+\\.\\d+\\)/"
 - button "Copy"
 - paragraph: I'll help you add a line to dummy.txt and commit the change. Let me first check if this file exists and create it if needed.
-- text: "/I've set the title of this sketch to \"Add a line to dummy\\.txt and commit the change\" agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+ Out: \\d+ \\(\\$\\d+\\.\\d+\\)/"
+- text: "/I've set the title of this sketch to \"Add a line to dummy\\.txt and commit the change\" agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+(,\\d+)* Out: \\d+(,\\d+)* \\(\\$\\d+\\.\\d+\\)/"
 - button "Copy"
 - group: /\+ bash 🖥️ ls -la [\d,.]+[hmsp]+ elapsed/
-- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+ Out: \\d+ \\(\\$\\d+\\.\\d+\\)/"
+- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+(,\\d+)* Out: \\d+(,\\d+)* \\(\\$\\d+\\.\\d+\\)/"
 - button "Copy"
 - paragraph: I see that dummy.txt already exists. Let me add a new line to it.
 - group: "/\\+ patch \\/Users\\/pokey\\/src\\/spaghetti\\/dummy\\.txt: 1 edit [\\d,.]+[hmsp]+ elapsed/"
-- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+ Out: \\d+ \\(\\$\\d+\\.\\d+\\)/"
+- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+(,\\d+)* Out: \\d+(,\\d+)* \\(\\$\\d+\\.\\d+\\)/"
 - button "Copy"
 - paragraph: "Now let me commit this change:"
 - group: "/\\+ bash 🖥️ GIT_AUTHOR_NAME=\"Pokey Rule\" GIT_AUTHOR_EMAIL=\"\\d+\\+pokey@users\\.noreply\\.github\\.com\" git add dummy\\.txt && git commit -m \"Add a new line to dummy\\.txt\" -m \"Co-Authored-By: sketch\" -m \"Add a line to dummy\\.txt\\. Doesn't matter what it is and don't bother running tests it's just a dummy repo\\.\" [\\d,.]+[hmsp]+ elapsed/"
@@ -30,18 +30,18 @@
 - button "Copy"
 - text: 1 new commit detected 898178a0 Add a new line to dummy.txt
 - button "View Diff"
-- text: "/A agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+ Out: \\d+ \\(\\$\\d+\\.\\d+\\)/"
+- text: "/A agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+(,\\d+)* Out: \\d+(,\\d+)* \\(\\$\\d+\\.\\d+\\)/"
 - button "Copy"
 - group: /\+ done ❌ codereview tool has not been run for commit 898178a0c6681ce2b641cbe8994c22ed8bbb7dd7 [\d,.]+[hmsp]+ elapsed/
-- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+ Out: \\d+ \\(\\$\\d+\\.\\d+\\)/"
+- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+(,\\d+)* Out: \\d+(,\\d+)* \\(\\$\\d+\\.\\d+\\)/"
 - button "Copy"
 - paragraph: "Let me run a code review as required:"
 - group: /\+ codereview ✔️ [\d,.]+[hmsp]+ elapsed/
-- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+ Out: \\d+ \\(\\$\\d+\\.\\d+\\)/"
+- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+(,\\d+)* Out: \\d+(,\\d+)* \\(\\$\\d+\\.\\d+\\)/"
 - button "Copy"
 - paragraph: "Now let me try the done call again:"
 - group: /\+ done [\d,.]+[hmsp]+ elapsed/
-- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+ Out: \\d+ \\(\\$\\d+\\.\\d+\\)/"
+- text: "/agent Apr \\d+, \\d+, \\d+:\\d+:\\d+ AM \\([\\d,.]+[hmsp]+\\) In: \\d+(,\\d+)* Out: \\d+(,\\d+)* \\(\\$\\d+\\.\\d+\\)/"
 - button "Copy"
 - paragraph: "I've completed your request:"
 - list:
diff --git a/webui/src/web-components/sketch-container-status.test.ts b/webui/src/web-components/sketch-container-status.test.ts
index b7dfd01..35c52b8 100644
--- a/webui/src/web-components/sketch-container-status.test.ts
+++ b/webui/src/web-components/sketch-container-status.test.ts
@@ -47,10 +47,10 @@
     mockCompleteState.total_usage.cache_read_input_tokens +
     mockCompleteState.total_usage.cache_creation_input_tokens;
   await expect(component.locator("#inputTokens")).toContainText(
-    expectedTotalInputTokens + "",
+    expectedTotalInputTokens.toLocaleString(),
   );
   await expect(component.locator("#outputTokens")).toContainText(
-    mockCompleteState.total_usage.output_tokens + "",
+    mockCompleteState.total_usage.output_tokens.toLocaleString(),
   );
   await expect(component.locator("#totalCost")).toContainText(
     "$" + mockCompleteState.total_usage.total_cost_usd.toFixed(2),
@@ -103,7 +103,7 @@
     partialState.total_usage.cache_read_input_tokens +
     partialState.total_usage.cache_creation_input_tokens;
   await expect(component.locator("#inputTokens")).toContainText(
-    expectedTotalInputTokens + "",
+    expectedTotalInputTokens.toLocaleString(),
   );
 
   // Check that elements without data are empty
diff --git a/webui/src/web-components/sketch-container-status.ts b/webui/src/web-components/sketch-container-status.ts
index 8079d2e..3994c74 100644
--- a/webui/src/web-components/sketch-container-status.ts
+++ b/webui/src/web-components/sketch-container-status.ts
@@ -1,6 +1,7 @@
 import { State } from "../types";
 import { LitElement, css, html } from "lit";
 import { customElement, property } from "lit/decorators.js";
+import { formatNumber } from "../utils";
 
 @customElement("sketch-container-status")
 export class SketchContainerStatus extends LitElement {
@@ -198,15 +199,17 @@
         <div class="info-item">
           <span class="info-label">Input tokens:</span>
           <span id="inputTokens" class="info-value"
-            >${(this.state?.total_usage?.input_tokens || 0) +
-            (this.state?.total_usage?.cache_read_input_tokens || 0) +
-            (this.state?.total_usage?.cache_creation_input_tokens || 0)}</span
+            >${formatNumber(
+              (this.state?.total_usage?.input_tokens || 0) +
+              (this.state?.total_usage?.cache_read_input_tokens || 0) +
+              (this.state?.total_usage?.cache_creation_input_tokens || 0)
+            )}</span
           >
         </div>
         <div class="info-item">
           <span class="info-label">Output tokens:</span>
           <span id="outputTokens" class="info-value"
-            >${this.state?.total_usage?.output_tokens}</span
+            >${formatNumber(this.state?.total_usage?.output_tokens)}</span
           >
         </div>
         <div class="info-item">
diff --git a/webui/src/web-components/sketch-timeline-message.test.ts b/webui/src/web-components/sketch-timeline-message.test.ts
index d5c8dfb..f68a5e0 100644
--- a/webui/src/web-components/sketch-timeline-message.test.ts
+++ b/webui/src/web-components/sketch-timeline-message.test.ts
@@ -149,8 +149,8 @@
   });
 
   await expect(component.locator(".message-usage")).toBeVisible();
-  await expect(component.locator(".message-usage")).toContainText("200"); // In (150 + 50 cache)
-  await expect(component.locator(".message-usage")).toContainText("300"); // Out
+  await expect(component.locator(".message-usage")).toContainText("200".toLocaleString()); // In (150 + 50 cache)
+  await expect(component.locator(".message-usage")).toContainText("300".toLocaleString()); // Out
   await expect(component.locator(".message-usage")).toContainText("$0.03"); // Cost
 });
 
diff --git a/webui/src/web-components/sketch-timeline-message.ts b/webui/src/web-components/sketch-timeline-message.ts
index a2dd533..95de17a 100644
--- a/webui/src/web-components/sketch-timeline-message.ts
+++ b/webui/src/web-components/sketch-timeline-message.ts
@@ -596,13 +596,14 @@
               ? html` <span class="message-usage">
                   <span title="Input tokens"
                     >In:
-                    ${(this.message?.usage?.input_tokens || 0) +
-                    (this.message?.usage?.cache_read_input_tokens || 0) +
-                    (this.message?.usage?.cache_creation_input_tokens ||
-                      0)}</span
+                    ${this.formatNumber(
+                      (this.message?.usage?.input_tokens || 0) +
+                      (this.message?.usage?.cache_read_input_tokens || 0) +
+                      (this.message?.usage?.cache_creation_input_tokens || 0)
+                    )}</span
                   >
                   <span title="Output tokens"
-                    >Out: ${this.message?.usage?.output_tokens}</span
+                    >Out: ${this.formatNumber(this.message?.usage?.output_tokens)}</span
                   >
                   <span title="Message cost"
                     >(${this.formatCurrency(