feat(antigravity): add Gemini 3.8 Flash tiers and update client fallbacks

changelog.d/features/12499-antigravity-gemini-3-8-flash.md

@@ -0,0 +1 @@
+- **feat(antigravity):** add Gemini 3.8 Flash high/medium/low tiers to the Antigravity and AGY catalogs, alias `gemini-3.8-flash` to High, and bump IDE/CLI client fallbacks to 2.5.5 / 1.1.24 so live Cloud Code endpoints no longer 404 ([#12499](https://github.com/diegosouzapw/OmniRoute/pull/12499)) — thanks @Abhishekchhetri020

open-sse/config/antigravityModelAliases.ts

@@ -1,14 +1,12 @@
-import {
-  ANTIGRAVITY_SHARED_MODELS,
-  buildSurfaceCatalog,
-} from "./antigravitySharedModels.ts";
+import { ANTIGRAVITY_SHARED_MODELS, buildSurfaceCatalog } from "./antigravitySharedModels.ts";
 
 export const ANTIGRAVITY_PUBLIC_MODELS = buildSurfaceCatalog(ANTIGRAVITY_SHARED_MODELS, {
   add: [], // IDE-only models (currently none)
   remove: [], // Models hidden from IDE (currently none)
 });
 
 export const ANTIGRAVITY_MODEL_ALIASES = Object.freeze({
+  "gemini-3.8-flash": "gemini-3.8-flash-high",
   // Gemini 3.7 Flash tiers map to the upstream tiered endpoint model; the thinking
   // budget is steered via generationConfig.thinkingConfig.thinkingBudget.
   "gemini-3.7-flash": "gemini-3.7-flash-tiered",

open-sse/config/antigravitySharedModels.ts

@@ -5,6 +5,36 @@
 // explicit add/remove delta in its own file (currently both deltas are empty).
 
 export const ANTIGRAVITY_SHARED_MODELS = Object.freeze([
+  // Gemini 3.8 Flash tiers. Unlike 3.7, Google's live Cloud Code endpoint
+  // (streamGenerateContent) serves 3.8 directly at the -high/-medium/-low tier
+  // ids — there is no gemini-3.8-flash-tiered upstream endpoint for 3.8.
+  {
+    id: "gemini-3.8-flash-high",
+    name: "Gemini 3.8 Flash (High)",
+    contextLength: 1048576,
+    maxOutputTokens: 65536,
+    supportsReasoning: true,
+    supportsVision: true,
+    toolCalling: true,
+  },
+  {
+    id: "gemini-3.8-flash-medium",
+    name: "Gemini 3.8 Flash (Medium)",
+    contextLength: 1048576,
+    maxOutputTokens: 65536,
+    supportsReasoning: true,
+    supportsVision: true,
+    toolCalling: true,
+  },
+  {
+    id: "gemini-3.8-flash-low",
+    name: "Gemini 3.8 Flash (Low)",
+    contextLength: 1048576,
+    maxOutputTokens: 65536,
+    supportsReasoning: true,
+    supportsVision: true,
+    toolCalling: true,
+  },
   // Gemini 3.7 Flash tiers. The live endpoint selects High by default and advertises
   // all three ids to both the IDE 2.5.5 and CLI 1.1.x clients.
   {

open-sse/config/freeModelCatalog.data.ts

@@ -28,6 +28,9 @@ export const FREE_MODEL_BUDGETS: FreeModelBudget[] = [
   { provider: "agentrouter", modelId: "claude-opus-4-8", displayName: "Claude Opus 4.8", monthlyTokens: 0, creditTokens: 200000000, freeType: "one-time-initial", poolKey: "agentrouter", tos: "caution" },
   { provider: "agentrouter", modelId: "claude-opus-5", displayName: "Claude Opus 5", monthlyTokens: 0, creditTokens: 200000000, freeType: "one-time-initial", poolKey: "agentrouter", tos: "caution" },
   { provider: "agentrouter", modelId: "gpt-5.6-sol", displayName: "GPT-5.6 Sol", monthlyTokens: 0, creditTokens: 200000000, freeType: "one-time-initial", poolKey: "agentrouter", tos: "caution" },
+  { provider: "agy", modelId: "gemini-3.8-flash-high", displayName: "Gemini 3.8 Flash (High)", monthlyTokens: 0, creditTokens: 0, freeType: "keyless", poolKey: "agy", tos: "avoid" },
+  { provider: "agy", modelId: "gemini-3.8-flash-medium", displayName: "Gemini 3.8 Flash (Medium)", monthlyTokens: 0, creditTokens: 0, freeType: "keyless", poolKey: "agy", tos: "avoid" },
+  { provider: "agy", modelId: "gemini-3.8-flash-low", displayName: "Gemini 3.8 Flash (Low)", monthlyTokens: 0, creditTokens: 0, freeType: "keyless", poolKey: "agy", tos: "avoid" },
   { provider: "agy", modelId: "gemini-3.7-flash-high", displayName: "Gemini 3.7 Flash (High)", monthlyTokens: 0, creditTokens: 0, freeType: "keyless", poolKey: "agy", tos: "avoid" },
   { provider: "agy", modelId: "gemini-3.7-flash-medium", displayName: "Gemini 3.7 Flash (Medium)", monthlyTokens: 0, creditTokens: 0, freeType: "keyless", poolKey: "agy", tos: "avoid" },
   { provider: "agy", modelId: "gemini-3.7-flash-low", displayName: "Gemini 3.7 Flash (Low)", monthlyTokens: 0, creditTokens: 0, freeType: "keyless", poolKey: "agy", tos: "avoid" },

open-sse/services/antigravityClientProfile.ts

@@ -62,7 +62,7 @@ function getProjectHeaderValue(body: unknown): string | null {
   const project =
     body && typeof body === "object" ? (body as Record<string, unknown>).project : null;
   if (typeof project !== "string" || project.trim().length === 0) return null;
-  if (project === "test-project" || project === "project-id") return null;
+  if (project === "test-project" || project === "project-id" || project === "aicode-consumers") return null;
   return project;
 }
 

open-sse/services/antigravityVersion.ts

@@ -5,8 +5,8 @@ const ANTIGRAVITY_CLI_RELEASE_URL =
 
 export const ANTIGRAVITY_VERSION_CACHE_TTL_MS = 6 * 60 * 60 * 1000;
 export const ANTIGRAVITY_VERSION_FETCH_TIMEOUT_MS = 5_000;
-export const ANTIGRAVITY_IDE_FALLBACK_VERSION = "2.1.1";
-export const ANTIGRAVITY_CLI_FALLBACK_VERSION = "1.1.5";
+export const ANTIGRAVITY_IDE_FALLBACK_VERSION = "2.5.5";
+export const ANTIGRAVITY_CLI_FALLBACK_VERSION = "1.1.24";
 
 type VersionCache = {
   fetchedAt: number;

src/shared/constants/cliTools.ts

@@ -242,6 +242,9 @@ export const CLI_TOOLS: Record<string, CliCatalogEntry> = {
     acpSpawnable: false,
     baseUrlSupport: "none",
     modelAliases: [
+      "gemini-3.8-flash-high",
+      "gemini-3.8-flash-medium",
+      "gemini-3.8-flash-low",
       "gemini-3.7-flash-high",
       "gemini-3.7-flash-medium",
       "gemini-3.7-flash-low",
@@ -252,6 +255,9 @@ export const CLI_TOOLS: Record<string, CliCatalogEntry> = {
       "gpt-oss-120b-medium",
     ],
     defaultModels: [
+      createCliModel("gemini-3.8-flash-high", "Gemini 3.8 Flash High"),
+      createCliModel("gemini-3.8-flash-medium", "Gemini 3.8 Flash Medium"),
+      createCliModel("gemini-3.8-flash-low", "Gemini 3.8 Flash Low"),
       createCliModel("gemini-3.7-flash-high", "Gemini 3.7 Flash High"),
       createCliModel("gemini-3.7-flash-medium", "Gemini 3.7 Flash Medium"),
       createCliModel("gemini-3.7-flash-low", "Gemini 3.7 Flash Low"),

src/shared/constants/modelSpecs.ts

@@ -197,8 +197,7 @@ export const MODEL_SPECS: Record<string, ModelSpec> = {
     supportsTools: true,
     supportsVision: true,
   },
-  // Output limit published at https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash.
-  // Thinking budgets follow the 3.7 Flash high/medium/low/tiered split.
+  // ── Gemini 3.8 Flash (current Antigravity/AGY live tiers) ─────────
   "gemini-3.8-flash-high": {
     maxOutputTokens: 65536,
     contextWindow: 1048576,
@@ -229,23 +228,13 @@ export const MODEL_SPECS: Record<string, ModelSpec> = {
   "gemini-3.8-flash": {
     maxOutputTokens: 65536,
     contextWindow: 1048576,
-    defaultThinkingBudget: 8192,
-    thinkingBudgetCap: 24576,
-    supportsThinking: true,
-    supportsTools: true,
-    supportsVision: true,
-    aliases: ["gemini-3.8-flash-tiered"],
-  },
-  "gemini-3.8-flash-tiered": {
-    maxOutputTokens: 65536,
-    contextWindow: 1048576,
-    defaultThinkingBudget: 8192,
+    defaultThinkingBudget: 24576,
     thinkingBudgetCap: 24576,
     supportsThinking: true,
     supportsTools: true,
     supportsVision: true,
+    aliases: ["gemini-3.8-flash-high"],
   },
-
   // Gemini 3.7 Flash tiers: high 24.5k, medium 8k, low 1k thinking tokens.
   "gemini-3.7-flash-high": {
     maxOutputTokens: 65536,

src/shared/constants/pricing/oauth-subscriptions.ts

@@ -15,6 +15,9 @@ import {
 } from "./shared-tiers";
 
 const ANTIGRAVITY_GEMINI_3_7_PRICING = {
+  "gemini-3.8-flash-low": GEMINI_3_7_FLASH_PROMO_PRICING,
+  "gemini-3.8-flash-medium": GEMINI_3_7_FLASH_PROMO_PRICING,
+  "gemini-3.8-flash-high": GEMINI_3_7_FLASH_PROMO_PRICING,
   "gemini-3.7-flash-low": GEMINI_3_7_FLASH_PROMO_PRICING,
   "gemini-3.7-flash-medium": GEMINI_3_7_FLASH_PROMO_PRICING,
   "gemini-3.7-flash-high": GEMINI_3_7_FLASH_PROMO_PRICING,

tests/unit/agy-provider.test.ts

@@ -51,6 +51,9 @@ test("agy ships its own live callable model catalog", () => {
   const ids = REGISTRY.agy.models.map((m) => m.id);
   assert.ok(ids.includes("claude-opus-4-6-thinking"), "must expose Claude Opus 4.6 Thinking");
   assert.ok(ids.includes("claude-sonnet-4-6"), "must expose Claude Sonnet 4.6");
+  assert.ok(ids.includes("gemini-3.8-flash-low"), "must expose Gemini 3.8 Flash Low");
+  assert.ok(ids.includes("gemini-3.8-flash-medium"), "must expose Gemini 3.8 Flash Medium");
+  assert.ok(ids.includes("gemini-3.8-flash-high"), "must expose Gemini 3.8 Flash High");
   assert.ok(ids.includes("gemini-3.7-flash-low"), "must expose Gemini 3.7 Flash Low");
   assert.ok(ids.includes("gemini-3.7-flash-medium"), "must expose Gemini 3.7 Flash Medium");
   assert.ok(ids.includes("gemini-3.7-flash-high"), "must expose Gemini 3.7 Flash High");
@@ -82,6 +85,9 @@ test("agy model helpers resolve catalog ids and display names", () => {
   assert.equal(isUserCallableAgyModelId("gemini-2.5-flash"), false);
   assert.equal(isUserCallableAgyModelId("gemini-3.1-pro-high"), false);
   assert.equal(isUserCallableAgyModelId("gemini-pro-agent"), true);
+  assert.equal(isUserCallableAgyModelId("gemini-3.8-flash-low"), true);
+  assert.equal(isUserCallableAgyModelId("gemini-3.8-flash-medium"), true);
+  assert.equal(isUserCallableAgyModelId("gemini-3.8-flash-high"), true);
   assert.equal(isUserCallableAgyModelId("gemini-3.7-flash-low"), true);
   assert.equal(isUserCallableAgyModelId("gemini-3.7-flash-medium"), true);
   assert.equal(isUserCallableAgyModelId("gemini-3.7-flash-high"), true);
@@ -102,6 +108,12 @@ test("agy model helpers resolve catalog ids and display names", () => {
     "Claude Opus 4.6 (Thinking)"
   );
   assert.equal(getClientVisibleAgyModelName("gemini-pro-agent"), "Gemini 3.1 Pro (High)");
+  assert.equal(getClientVisibleAgyModelName("gemini-3.8-flash-low"), "Gemini 3.8 Flash (Low)");
+  assert.equal(
+    getClientVisibleAgyModelName("gemini-3.8-flash-medium"),
+    "Gemini 3.8 Flash (Medium)"
+  );
+  assert.equal(getClientVisibleAgyModelName("gemini-3.8-flash-high"), "Gemini 3.8 Flash (High)");
   assert.equal(getClientVisibleAgyModelName("gemini-3.7-flash-low"), "Gemini 3.7 Flash (Low)");
   assert.equal(
     getClientVisibleAgyModelName("gemini-3.7-flash-medium"),

tests/unit/antigravity-client-profile.test.ts

@@ -121,6 +121,22 @@ test("content header application emits IDE and CLI identities and strips fake he
   assert.equal(cliHeaders["x-goog-user-project"], "project-1");
 });
 
+test("content headers omit x-goog-user-project for the aicode-consumers default project", () => {
+  seedAntigravityIdeVersionCache("2.1.1");
+  const headers: Record<string, string> = {
+    Authorization: "Bearer token",
+    "x-goog-user-project": "stale-project",
+  };
+
+  applyAntigravityClientProfileHeaders(
+    headers,
+    { connectionId: "connection-ide", providerSpecificData: { clientProfile: "ide" } },
+    { project: "aicode-consumers" }
+  );
+
+  assert.equal(headers["x-goog-user-project"], undefined);
+});
+
 test("public request envelopes never infer the internal jetski identity from email", () => {
   assert.equal(getAntigravityEnvelopeUserAgent({ email: "user@gmail.com" }), "antigravity");
   assert.equal(getAntigravityEnvelopeUserAgent({ email: "user@company.example" }), "antigravity");

tests/unit/antigravity-model-aliases.test.ts

@@ -21,12 +21,23 @@ function getPublicModel(id: string) {
 // `gemini-3.7-flash-tiered`) in favor of three directly-callable tiered public models —
 // the suffixed ids now work upstream without the collapsing alias. Keep this list in sync
 // with ANTIGRAVITY_PUBLIC_MODELS/ANTIGRAVITY_MODEL_ALIASES instead of the retired bare id.
-const EXPECTED_FLASH_TIERS = [
+const EXPECTED_38_FLASH_TIERS = [
+  ["gemini-3.8-flash-high", "Gemini 3.8 Flash (High)"],
+  ["gemini-3.8-flash-medium", "Gemini 3.8 Flash (Medium)"],
+  ["gemini-3.8-flash-low", "Gemini 3.8 Flash (Low)"],
+] as const;
+
+const EXPECTED_37_FLASH_TIERS = [
   ["gemini-3.7-flash-high", "Gemini 3.7 Flash (High)"],
   ["gemini-3.7-flash-medium", "Gemini 3.7 Flash (Medium)"],
   ["gemini-3.7-flash-low", "Gemini 3.7 Flash (Low)"],
 ] as const;
 
+const EXPECTED_FLASH_TIERS = [
+  ...EXPECTED_38_FLASH_TIERS,
+  ...EXPECTED_37_FLASH_TIERS,
+] as const;
+
 const RETIRED_FLASH_IDS = [
   "gemini-3.6-flash-low",
   "gemini-3.6-flash-medium",
@@ -57,7 +68,11 @@ test("toClientAntigravityQuotaModelId preserves upstream Gemini Flash bucket IDs
 
 test("resolveAntigravityModelId maps the documented Antigravity aliases to upstream IDs", () => {
   assert.equal(resolveAntigravityModelId("gemini-3-pro-image-preview"), "gemini-3-pro-image");
-  for (const [modelId] of EXPECTED_FLASH_TIERS) {
+  for (const [modelId] of EXPECTED_38_FLASH_TIERS) {
+    assert.equal(resolveAntigravityModelId(modelId), modelId);
+  }
+  assert.equal(resolveAntigravityModelId("gemini-3.8-flash"), "gemini-3.8-flash-high");
+  for (const [modelId] of EXPECTED_37_FLASH_TIERS) {
     assert.equal(resolveAntigravityModelId(modelId), "gemini-3.7-flash-tiered");
   }
   assert.equal(resolveAntigravityModelId("gemini-3.7-flash"), "gemini-3.7-flash-tiered");

tests/unit/antigravity-per-model-output-cap.test.ts

@@ -204,7 +204,6 @@ test("Gemini 3.8 Flash retains its output allowance above the thinking budget",
     "gemini-3.8-flash-high",
     "gemini-3.8-flash-medium",
     "gemini-3.8-flash-low",
-    "gemini-3.8-flash-tiered",
   ]) {
     const result = await executor.transformRequest(
       `antigravity/${model}`,
@@ -232,7 +231,6 @@ test("Gemini 3.8 Flash static spec keeps thinking and context, not only the outp
     "gemini-3.8-flash-high": 24576,
     "gemini-3.8-flash-medium": 8192,
     "gemini-3.8-flash-low": 1024,
-    "gemini-3.8-flash-tiered": 8192,
   };
   for (const model of Object.keys(expectedBudget)) {
     const caps = getResolvedModelCapabilities({

tests/unit/antigravity-retired-public-models.test.ts

@@ -32,6 +32,9 @@ const RETIRED_PUBLIC_MODELS = [
 ] as const;
 
 const EXPECTED_LEADING_MODEL_ORDER = [
+  "gemini-3.8-flash-high",
+  "gemini-3.8-flash-medium",
+  "gemini-3.8-flash-low",
   "gemini-3.7-flash-high",
   "gemini-3.7-flash-medium",
   "gemini-3.7-flash-low",
@@ -45,6 +48,9 @@ const EXPECTED_LEADING_MODEL_ORDER = [
 ] as const;
 
 const ACTIVE_FLASH_MODEL_IDS = [
+  "gemini-3.8-flash-high",
+  "gemini-3.8-flash-medium",
+  "gemini-3.8-flash-low",
   "gemini-3.7-flash-high",
   "gemini-3.7-flash-medium",
   "gemini-3.7-flash-low",
@@ -112,7 +118,7 @@ test("Antigravity and AGY expose gemini-pro-agent and gemini-3.1-pro-high as cal
   );
 });
 
-test("Antigravity support catalogs expose every live Gemini 3.7 Flash tier", () => {
+test("Antigravity support catalogs expose every live Gemini Flash tier", () => {
   const antigravityModelIds = new Set(ANTIGRAVITY_PUBLIC_MODELS.map((model) => model.id));
   const agyModelIds = new Set(AGY_PUBLIC_MODELS.map((model) => model.id));
   const cliAliases = new Set(CLI_TOOLS.antigravity.modelAliases);