diff --git a/CHANGELOG.md b/CHANGELOG.md
index fc9153b6ef..ab85227bb1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -82,6 +82,7 @@ _In development — bullets added per PR; finalized at release._
 - **fix(providers): model-aware `supportsRedactedThinking` for mixed-format providers** — the redacted-thinking capability was resolved per provider rather than per model, so a mixed-format provider (some models support redacted thinking, others don't) got the wrong answer for some models; the check is now model-aware. ([#4479](https://github.com/diegosouzapw/OmniRoute/pull/4479) — thanks @TF0rd)
 - **fix(usage): parse numeric-string quota reset timestamps as Unix seconds/ms** — when a provider returned the quota reset timestamp as a numeric string (e.g. `"1700000000"`), `parseResetTime` passed it straight to `new Date(str)`, which returned `Invalid Date` and dropped the reset entirely (UI showed no reset). Numeric strings are now detected and treated as Unix timestamps with the same `< 1e12` seconds-vs-ms heuristic already applied to numeric values; ISO/parseable strings are untouched. Applied symmetrically in `codexUsageQuotas.parseResetTime`. (Inspired by upstream [decolua/9router#768](https://github.com/decolua/9router/pull/768) — thanks @DEYLNN)
 - **fix(usage): clearer "auth expired" message for Kiro accounts added via Google/GitHub social-auth** — a Kiro account created through the `/api/oauth/kiro/social-exchange` flow (Google or GitHub social login) uses a token format that AWS CodeWhisperer's `GetUsageLimits` quota API frequently rejects with 401/403 even when `/messages` still works. The quota card was throwing the raw upstream error blob (`Failed to fetch Kiro usage: Kiro API error (401): {…}`); social-auth accounts now get the same friendly `Kiro quota API authentication expired. Chat may still work.` message that legacy social-auth users with a stored marker already see, while Builder-ID / IDC accounts keep the existing throw-on-failure behavior so transient upstream errors don't get silently masked. (thanks @anuragg-saxenaa)
+- **fix(dashboard): Antigravity CLI Tools model picker now lists API-Key-Compatible custom providers** — the API-Key-compatible / passthrough provider groups in `ModelSelectModal` are derived from the user's `modelAliases`, but `AntigravityToolCard` was the only CLI tool card that didn't fetch `/api/models/alias` or forward the `modelAliases` prop, so a custom OpenAI-compatible provider added in OmniRoute never surfaced in the Antigravity tool's model picker — routing a custom model to Antigravity from there was impossible. The card now mirrors the pattern already used by every sibling tool card (Codex, Claude, Cline, Kilo, Droid, OpenClaw, HermesAgent). (thanks @mxskeen)
 
 ### 🔒 Security
 
diff --git a/src/app/(dashboard)/dashboard/cli-code/components/AntigravityToolCard.tsx b/src/app/(dashboard)/dashboard/cli-code/components/AntigravityToolCard.tsx
index b385f09385..146b378522 100644
--- a/src/app/(dashboard)/dashboard/cli-code/components/AntigravityToolCard.tsx
+++ b/src/app/(dashboard)/dashboard/cli-code/components/AntigravityToolCard.tsx
@@ -27,6 +27,10 @@ export default function AntigravityToolCard({
   const [modelMappings, setModelMappings] = useState({});
   const [modalOpen, setModalOpen] = useState(false);
   const [currentEditingAlias, setCurrentEditingAlias] = useState(null);
+  // Model aliases drive the API-Key-compatible / passthrough provider groups in
+  // ModelSelectModal — without them, custom OpenAI/Anthropic-compatible
+  // providers don't surface in the picker even when active.
+  const [modelAliases, setModelAliases] = useState({});
 
   // (#523) Store the key *id* (not the masked string) so the backend can
   // resolve the real secret from DB before writing to config files.
@@ -40,6 +44,7 @@ export default function AntigravityToolCard({
     if (isExpanded && !status) {
       fetchStatus();
       loadSavedMappings();
+      fetchModelAliases();
     }
   }, [isExpanded, status]);
 
@@ -72,6 +77,16 @@ export default function AntigravityToolCard({
     }
   };
 
+  const fetchModelAliases = async () => {
+    try {
+      const res = await fetch("/api/models/alias");
+      const data = await res.json();
+      if (res.ok) setModelAliases(data.aliases || {});
+    } catch (error) {
+      console.log("Error fetching model aliases:", error);
+    }
+  };
+
   // Windows uses UAC dialog, no sudo needed
   const isWindows = typeof navigator !== "undefined" && navigator.userAgent?.includes("Windows");
 
@@ -460,6 +475,7 @@ export default function AntigravityToolCard({
         onSelect={handleModelSelect}
         selectedModel={currentEditingAlias ? modelMappings[currentEditingAlias] : null}
         activeProviders={activeProviders}
+        modelAliases={modelAliases}
         title={t("selectModelForAlias", { alias: currentEditingAlias || "" })}
       />
     </Card>
diff --git a/tests/unit/ui/AntigravityToolCard-model-aliases.test.tsx b/tests/unit/ui/AntigravityToolCard-model-aliases.test.tsx
new file mode 100644
index 0000000000..ed51939819
--- /dev/null
+++ b/tests/unit/ui/AntigravityToolCard-model-aliases.test.tsx
@@ -0,0 +1,37 @@
+import { describe, expect, it } from "vitest";
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, resolve } from "node:path";
+
+// Source-level parity check (#241): AntigravityToolCard must surface
+// API-Key-compatible / custom OpenAI-compatible providers in its model picker.
+// Those provider groups in <ModelSelectModal> are derived from `modelAliases`
+// — without the prop, custom-keyed providers are silently hidden even when
+// active. The fix mirrors the pattern already used by every sibling CLI tool
+// card (Codex, Claude, Cline, Kilo, Droid, OpenClaw, HermesAgent).
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const CARD_PATH = resolve(
+  __dirname,
+  "../../../src/app/(dashboard)/dashboard/cli-code/components/AntigravityToolCard.tsx"
+);
+
+describe("AntigravityToolCard model alias wiring", () => {
+  const source = readFileSync(CARD_PATH, "utf8");
+
+  it("declares modelAliases state", () => {
+    expect(source).toMatch(/useState\(\{\}\)/);
+    expect(source).toMatch(/setModelAliases/);
+  });
+
+  it("fetches /api/models/alias when expanded", () => {
+    expect(source).toContain('fetch("/api/models/alias")');
+    expect(source).toMatch(/fetchModelAliases\s*\(\s*\)/);
+  });
+
+  it("passes modelAliases prop to ModelSelectModal", () => {
+    // Regression guard for upstream parity: the prop is what unlocks the
+    // API-Key-compatible / passthrough provider groups in the picker.
+    expect(source).toMatch(/modelAliases=\{modelAliases\}/);
+  });
+});