diff --git a/packages/shared/src/usageLimits.test.ts b/packages/shared/src/usageLimits.test.ts
index bed48428a93c4..8f7fa26d7e728 100644
--- a/packages/shared/src/usageLimits.test.ts
+++ b/packages/shared/src/usageLimits.test.ts
@@ -804,6 +804,52 @@ describe("pools", () => {
     ).toEqual(["weekly", "weekly:secondary"]);
   });
 
+  it("weights pooled Codex quota and resets by each account's plan capacity", () => {
+    const [pool] = collectLimitPools(
+      collectLimitAccounts(
+        new Map([
+          [
+            EnvironmentId.make("env-a"),
+            {
+              ...laptop,
+              serverConfig: {
+                providers: [],
+                usageLimitSources: [
+                  {
+                    ...source,
+                    accounts: [
+                      ["pro", "ChatGPT Pro 200 Subscription", 100],
+                      ["plus", "ChatGPT Plus Subscription", 0],
+                    ].map(([id, plan, usedPercent]) => ({
+                      id: String(id),
+                      email: `${id}@example.com`,
+                      driver: ProviderDriverKind.make("codex"),
+                      plan: String(plan),
+                      usageLimits: {
+                        checkedAt,
+                        windows: [{ ...weekly, id: "secondary", usedPercent: Number(usedPercent) }],
+                      },
+                    })),
+                  },
+                ],
+              },
+            },
+          ],
+        ]),
+      ),
+      now,
+    );
+    const [pooledWeekly] = pool?.windows ?? [];
+    // Pro 20x holds 20 of the pool's 21 capacity parts.
+    expect(pooledWeekly?.remainingPercent).toBe(5);
+    expect(
+      pooledWeekly?.resets.map(({ member, restoresPercent }) => [
+        member.account.email,
+        restoresPercent,
+      ]),
+    ).toContainEqual(["pro@example.com", 95]);
+  });
+
   it("pools windows by id across accounts and orders resets by when they land", () => {
     const input = new Map([
       [
diff --git a/packages/shared/src/usageLimits.ts b/packages/shared/src/usageLimits.ts
index 716103ac2fc9b..ed38fdeb45b4e 100644
--- a/packages/shared/src/usageLimits.ts
+++ b/packages/shared/src/usageLimits.ts
@@ -539,6 +539,25 @@ function accountSortName(account: LimitAccount): string {
   return (account.displayName ?? account.email ?? account.key).toLowerCase();
 }
 
+const CODEX_PLAN_CAPACITY: Record<string, number> = {
+  "ChatGPT Plus Subscription": 1,
+  "ChatGPT Pro 100 Subscription": 5,
+  "ChatGPT Pro 200 Subscription": 20,
+};
+// Claude's published plan multipliers describe the session allowance only.
+const CLAUDE_SESSION_CAPACITY: Record<string, number> = { Pro: 1, Max: 5, Ultra: 20 };
+
+function planCapacity(account: LimitAccount, kind: ServerProviderUsageWindow["kind"]) {
+  if (!account.plan) return undefined;
+  if (account.driver === "codex" && (kind === "session" || kind === "weekly")) {
+    return CODEX_PLAN_CAPACITY[account.plan];
+  }
+  if (account.driver === "claudeAgent" && kind === "session") {
+    return CLAUDE_SESSION_CAPACITY[account.plan];
+  }
+  return undefined;
+}
+
 // Codex ids name slots, so pool by kind; other drivers' ids identify distinct allowances.
 function poolKey(driver: ServerProvider["driver"], window: ServerProviderUsageWindow): string {
   return driver === "codex" ? window.kind : `${window.kind}:${window.id}`;
@@ -607,15 +626,28 @@ function poolWindows(accounts: readonly LimitAccount[], now: number): readonly L
     const memberByAccount = new Map(members.map((member) => [member.account.key, member]));
     const first = members[0]!.window;
     const id = members[0]!.account.driver === "codex" ? key : first.id;
-    const usedPercent = members.reduce((sum, m) => sum + m.window.usedPercent, 0) / members.length;
+    // One unknown plan makes the pool incomparable by plan, so every member then counts once.
+    const capacities = members.map((m) => planCapacity(m.account, first.kind));
+    const weights = capacities.every((capacity) => capacity !== undefined)
+      ? capacities
+      : members.map(() => 1);
+    const weightOf = new Map(members.map((m, index) => [m, weights[index]!]));
+    const totalWeight = weights.reduce((sum, weight) => sum + weight, 0);
+    const usedPercent =
+      members.reduce((sum, m) => sum + m.window.usedPercent * weightOf.get(m)!, 0) / totalWeight;
     // Judge pace only for windows with reset clocks; others add spend without elapsed time.
     const timed = members.flatMap((m) => {
       const share = elapsedShare(m.window, now);
-      return share === null ? [] : [{ used: m.window.usedPercent, elapsed: share }];
+      return share === null
+        ? []
+        : [{ used: m.window.usedPercent, elapsed: share, weight: weightOf.get(m)! }];
     });
-    const timedUsed = timed.reduce((sum, t) => sum + t.used, 0) / timed.length;
+    const timedWeight = timed.reduce((sum, t) => sum + t.weight, 0);
+    const timedUsed = timed.reduce((sum, t) => sum + t.used * t.weight, 0) / timedWeight;
     const meanElapsed =
-      timed.length > 0 ? timed.reduce((sum, t) => sum + t.elapsed, 0) / timed.length : null;
+      timed.length > 0
+        ? timed.reduce((sum, t) => sum + t.elapsed * t.weight, 0) / timedWeight
+        : null;
     const resets = members
       .flatMap((member) => {
         const at = resetMillis(member.window);
@@ -625,7 +657,9 @@ function poolWindows(accounts: readonly LimitAccount[], now: number): readonly L
               {
                 member,
                 at,
-                restoresPercent: Math.round(member.refillPercent / members.length),
+                restoresPercent: Math.round(
+                  (member.refillPercent * weightOf.get(member)!) / totalWeight,
+                ),
               },
             ];
       })