feat(gemini): add Gemini 3.6 Flash tier routing and 3.5 Flash Lite

Add gemini-3.6-flash tiered (high/medium/low) for Antigravity routing
via upstreamModelId "gemini-3.6-flash-tiered(level)" + thinkingLevel,
plus gemini-3.6-flash and gemini-3.5-flash-lite direct API models.

- getModelUpstreamId: split (level) suffix before lookup, re-append after
- Antigravity executor: preserve transformed body.model
- MITM extractModel: parse thinkingLevel for tiered model (default medium)
- Isolate Cloud Code endpoints: discovery (loadCodeAssist/onboardUser/
  quota) on PROD cloudcode-pa, chat transport on daily-cloudcode-pa
  to bypass prod 429

cli/src/cli/menus/providers.js

@@ -53,6 +53,9 @@ const PROVIDER_MODELS = {
     { id: "glm-4.7" },
   ],
   ag: [
+    { id: "gemini-3.6-flash-high" },
+    { id: "gemini-3.6-flash-medium" },
+    { id: "gemini-3.6-flash-low" },
     { id: "gemini-3-flash-agent" },
     { id: "gemini-3.5-flash-low" },
     { id: "gemini-3.5-flash-extra-low" },
@@ -95,6 +98,8 @@ const PROVIDER_MODELS = {
     { id: "claude-3-5-sonnet-20241022" },
   ],
   gemini: [
+    { id: "gemini-3.6-flash" },
+    { id: "gemini-3.5-flash-lite" },
     { id: "gemini-3-pro-preview" },
     { id: "gemini-2.5-pro" },
     { id: "gemini-2.5-flash" },

open-sse/config/appConstants.js

@@ -134,10 +134,19 @@ export const ANTIGRAVITY_HEADERS = {
   "User-Agent": ANTIGRAVITY_IDE_USER_AGENT
 };
 
-// Cloud Code Assist API
+// Cloud Code Assist API endpoints differ by client ecosystem.
 export const CLOUD_CODE_API = {
-  loadCodeAssist: "https://cloudcode-pa.googleapis.com/v1internal:loadCodeAssist",
+  "gemini-cli": {
-  onboardUser: "https://cloudcode-pa.googleapis.com/v1internal:onboardUser",
+    loadCodeAssist: "https://cloudcode-pa.googleapis.com/v1internal:loadCodeAssist",
+    onboardUser: "https://cloudcode-pa.googleapis.com/v1internal:onboardUser",
+  },
+  // Project discovery (loadCodeAssist/onboardUser) stays on PROD — the daily host
+  // rejects these auth/onboarding calls. Only chat traffic uses the daily host
+  // (see transport.apiEndpoint in registry/antigravity.js, set to bypass prod 429).
+  antigravity: {
+    loadCodeAssist: "https://cloudcode-pa.googleapis.com/v1internal:loadCodeAssist",
+    onboardUser: "https://cloudcode-pa.googleapis.com/v1internal:onboardUser",
+  },
 };
 
 export const LOAD_CODE_ASSIST_HEADERS = {

open-sse/config/providerModels.js

@@ -4,7 +4,6 @@ import REGISTRY from "../providers/registry/index.js";
 import { PROVIDER_MODELS } from "../providers/index.js";
 import { modelQuotaFamily, modelStrip, modelTargetFormat, normalizeModelId } from "../providers/models/schema.js";
 import { CODEX_REVIEW_SUFFIX } from "../providers/models/helpers.js";
-
 export { PROVIDER_MODELS };
 
 
@@ -70,8 +69,13 @@ export function getModelUpstreamId(aliasOrId, modelId) {
   const baseId = suffix ? modelId.slice(0, sufMatch.index).trim() : modelId;
   const models = PROVIDER_MODELS[aliasOrId];
   const found = findModel(models, baseId, aliasOrId);
-  if (found?.upstreamModelId) return found.upstreamModelId + suffix;
+  const resolvedId = found?.upstreamModelId || found?.id;
-  if (found?.id) return found.id + suffix;
+  if (resolvedId) {
+    const presetMatch = resolvedId.match(/\([^()]+\)\s*$/);
+    const presetSuffix = presetMatch?.[0] || "";
+    const resolvedBase = presetSuffix ? resolvedId.slice(0, presetMatch.index).trim() : resolvedId;
+    return resolvedBase + (suffix || presetSuffix);
+  }
   if (aliasOrId === "cx" && typeof baseId === "string" && baseId.endsWith(CODEX_REVIEW_SUFFIX)) {
     return baseId.slice(0, -CODEX_REVIEW_SUFFIX.length) + suffix;
   }

open-sse/executors/antigravity.js

@@ -264,7 +264,7 @@ export class AntigravityExecutor extends BaseExecutor {
     return {
       ...body,
       project: projectId,
-      model: model,
+      model: body.model || model,
       userAgent: "antigravity",
       requestType: "agent",
       requestId: buildIdeRequestId({ body, request: transformedRequest, credentials, model, requestType: "agent" }),

open-sse/providers/registry/antigravity.js

@@ -36,6 +36,7 @@ export default {
       },
     },
     usage: {
+      // Discovery (quota/project) on PROD; daily host rejects these.
       quotaApiUrl: "https://cloudcode-pa.googleapis.com/v1internal:fetchAvailableModels",
       loadProjectApiUrl: "https://cloudcode-pa.googleapis.com/v1internal:loadCodeAssist",
       tokenUrl: "https://oauth2.googleapis.com/token",
@@ -44,9 +45,9 @@ export default {
     clientSecret: "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",
   },
   models: [
-    { id: "gemini-3.6-flash-high", name: "Gemini 3.6 Flash (High)" },
+    { id: "gemini-3.6-flash-high", name: "Gemini 3.6 Flash (High)", upstreamModelId: "gemini-3.6-flash-tiered(high)" },
-    { id: "gemini-3.6-flash-medium", name: "Gemini 3.6 Flash (Medium)" },
+    { id: "gemini-3.6-flash-medium", name: "Gemini 3.6 Flash (Medium)", upstreamModelId: "gemini-3.6-flash-tiered(medium)" },
-    { id: "gemini-3.6-flash-low", name: "Gemini 3.6 Flash (Low)" },
+    { id: "gemini-3.6-flash-low", name: "Gemini 3.6 Flash (Low)", upstreamModelId: "gemini-3.6-flash-tiered(low)" },
     { id: "gemini-3.5-flash-high", name: "Gemini 3.5 Flash (High)" },
     { id: "gemini-3-flash-agent", name: "Gemini 3.5 Flash (High)" },
     { id: "gemini-3.5-flash-low", name: "Gemini 3.5 Flash (Medium)" },
@@ -71,7 +72,7 @@ export default {
       "https://www.googleapis.com/auth/cclog",
       "https://www.googleapis.com/auth/experimentsandconfigs",
     ],
-    apiEndpoint: "https://cloudcode-pa.googleapis.com",
+    apiEndpoint: "https://daily-cloudcode-pa.googleapis.com",
     apiVersion: "v1internal",
     loadCodeAssistEndpoint: "https://cloudcode-pa.googleapis.com/v1internal:loadCodeAssist",
     onboardUserEndpoint: "https://cloudcode-pa.googleapis.com/v1internal:onboardUser",

open-sse/providers/shared.js

@@ -58,7 +58,7 @@ export const ANTHROPIC_COMPAT_BASE = "https://api.anthropic.com/v1";
 // Keep this static even when 9router runs on Linux: the provider profile is
 // intentionally matching the IDE client, not the server host.
 export const ANTIGRAVITY_IDE_VERSION = "2.1.1";
-export const ANTIGRAVITY_IDE_BASE_URL = "https://cloudcode-pa.googleapis.com";
+export const ANTIGRAVITY_IDE_BASE_URL = "https://daily-cloudcode-pa.googleapis.com";
 export const ANTIGRAVITY_IDE_USER_AGENT = `antigravity/ide/${ANTIGRAVITY_IDE_VERSION} darwin/arm64`;
 
 // Antigravity OAuth client credentials (public CLI client — duplicated in usage.js + src/lib/oauth)

open-sse/services/projectId.js

@@ -83,7 +83,7 @@ startCacheCleanup();
  * @param {string} accessToken  - Valid OAuth access token
  * @returns {Promise<string|null>} Real project ID or null
  */
-export async function getProjectIdForConnection(connectionId, accessToken) {
+export async function getProjectIdForConnection(connectionId, accessToken, provider = "gemini-cli") {
     if (!connectionId || !accessToken) return null;
 
     // Return cached value if still fresh
@@ -102,7 +102,7 @@ export async function getProjectIdForConnection(connectionId, accessToken) {
 
     const promise = (async () => {
         try {
-            const projectId = await fetchProjectId(accessToken, controller.signal);
+            const projectId = await fetchProjectId(accessToken, controller.signal, provider);
             if (projectId) {
                 projectIdCache.set(connectionId, {projectId, fetchedAt: Date.now()});
                 return projectId;
@@ -155,8 +155,9 @@ export function removeConnection(connectionId) {
  * @param {AbortSignal} signal
  * @returns {Promise<string|null>}
  */
-async function fetchProjectId(accessToken, signal) {
+async function fetchProjectId(accessToken, signal, provider) {
-    const response = await fetch(CLOUD_CODE_API.loadCodeAssist, {
+    const endpoints = CLOUD_CODE_API[provider] || CLOUD_CODE_API["gemini-cli"];
+    const response = await fetch(endpoints.loadCodeAssist, {
         method: "POST",
         headers: { ...LOAD_CODE_ASSIST_HEADERS, "Authorization": `Bearer ${accessToken}` },
         body: JSON.stringify({ metadata: LOAD_CODE_ASSIST_METADATA }),
@@ -185,7 +186,7 @@ async function fetchProjectId(accessToken, signal) {
         }
     }
 
-    return onboardUser(accessToken, tierID, signal);
+    return onboardUser(accessToken, tierID, signal, endpoints);
 }
 
 /**
@@ -196,7 +197,7 @@ async function fetchProjectId(accessToken, signal) {
  * @param {AbortSignal} externalSignal  – propagated from the connection's AbortController
  * @returns {Promise<string|null>}
  */
-async function onboardUser(accessToken, tierID, externalSignal) {
+async function onboardUser(accessToken, tierID, externalSignal, endpoints) {
     console.log(`[ProjectId] Onboarding user with tier: ${tierID}`);
 
     const reqBody = { tierId: tierID, metadata: LOAD_CODE_ASSIST_METADATA };
@@ -213,7 +214,7 @@ async function onboardUser(accessToken, tierID, externalSignal) {
         externalSignal?.addEventListener("abort", forwardAbort);
 
         try {
-            const response = await fetch(CLOUD_CODE_API.onboardUser, {
+            const response = await fetch(endpoints.onboardUser, {
                 method: "POST",
                 headers: { ...LOAD_CODE_ASSIST_HEADERS, "Authorization": `Bearer ${accessToken}` },
                 body: JSON.stringify(reqBody),

src/mitm/config.js

@@ -86,4 +86,45 @@ function getToolForHost(host) {
   return null;
 }
 
-module.exports = { IS_DEV, LSOF_BIN, TARGET_HOSTS, URL_PATTERNS, MODEL_SYNONYMS, MODEL_PATTERNS, MODEL_NO_MAP, LOG_BLACKLIST_URL_PARTS, getToolForHost };
+function isBinaryData(buffer) {
+  if (!buffer || buffer.length === 0) return false;
+  const sample = buffer.slice(0, Math.min(100, buffer.length));
+  let nonPrintable = 0;
+  for (let i = 0; i < sample.length; i++) {
+    const byte = sample[i];
+    if (byte < 0x20 && byte !== 0x09 && byte !== 0x0A && byte !== 0x0D) {
+      nonPrintable++;
+    }
+    if (byte > 0x7E) nonPrintable++;
+  }
+  return (nonPrintable / sample.length) > 0.3;
+}
+
+// Extract model from URL path (Gemini), body (OpenAI/Anthropic), or Kiro conversationState.
+function extractModel(url, body) {
+  const urlMatch = url.match(/\/models\/([^/:]+)/);
+  const urlModel = urlMatch?.[1] || null;
+
+  if (isBinaryData(body)) return urlModel;
+
+  try {
+    const parsed = JSON.parse(body.toString());
+    if (parsed.conversationState) {
+      return parsed.conversationState.currentMessage?.userInputMessage?.modelId || null;
+    }
+    const model = urlModel || parsed.model || null;
+    if (String(model).replace(/^models\//, "") === "gemini-3.6-flash-tiered") {
+      const rawLevel = parsed.request?.generationConfig?.thinkingConfig?.thinkingLevel
+        || parsed.generationConfig?.thinkingConfig?.thinkingLevel;
+      const level = ["high", "medium", "low"].includes(String(rawLevel).toLowerCase())
+        ? String(rawLevel).toLowerCase()
+        : "medium";
+      return `gemini-3.6-flash-${level}`;
+    }
+    return model;
+  } catch {
+    return urlModel;
+  }
+}
+
+module.exports = { IS_DEV, LSOF_BIN, TARGET_HOSTS, URL_PATTERNS, MODEL_SYNONYMS, MODEL_PATTERNS, MODEL_NO_MAP, LOG_BLACKLIST_URL_PARTS, getToolForHost, extractModel };

src/mitm/server.js

@@ -7,7 +7,7 @@ const dns = require("dns");
 const { promisify } = require("util");
 const { execSync } = require("child_process");
 const { log, err, dumpRequest, createResponseDumper, clearDumpDir } = require("./logger");
-const { IS_DEV, LSOF_BIN, TARGET_HOSTS, URL_PATTERNS, MODEL_SYNONYMS, MODEL_PATTERNS, MODEL_NO_MAP, getToolForHost } = require("./config");
+const { IS_DEV, LSOF_BIN, TARGET_HOSTS, URL_PATTERNS, MODEL_SYNONYMS, MODEL_PATTERNS, MODEL_NO_MAP, getToolForHost, extractModel } = require("./config");
 const { DATA_DIR, MITM_DIR } = require("./paths");
 const { generateCert, getCertForDomain } = require("./cert/generate");
 const { getMitmAlias } = require("./dbReader");
@@ -96,42 +96,6 @@ function collectBodyRaw(req) {
   });
 }
 
-// Extract model from URL path (Gemini), body (OpenAI/Anthropic), or Kiro conversationState
-function extractModel(url, body) {
-  const urlMatch = url.match(/\/models\/([^/:]+)/);
-  if (urlMatch) return urlMatch[1];
-  
-  // Skip parsing if body is binary (AWS EventStream, Protocol Buffers, etc.)
-  if (isBinaryData(body)) return null;
-  
-  try {
-    const parsed = JSON.parse(body.toString());
-    if (parsed.conversationState) {
-      return parsed.conversationState.currentMessage?.userInputMessage?.modelId || null;
-    }
-    return parsed.model || null;
-  } catch { return null; }
-}
-
-// Detect binary data vs JSON text
-function isBinaryData(buffer) {
-  if (!buffer || buffer.length === 0) return false;
-  // AWS EventStream signature: first 4 bytes = frame length (big-endian uint32)
-  // Check for non-printable chars in first 100 bytes (common in binary protocols)
-  const sample = buffer.slice(0, Math.min(100, buffer.length));
-  let nonPrintable = 0;
-  for (let i = 0; i < sample.length; i++) {
-    const byte = sample[i];
-    // Count non-ASCII printable chars (excluding whitespace)
-    if (byte < 0x20 && byte !== 0x09 && byte !== 0x0A && byte !== 0x0D) {
-      nonPrintable++;
-    }
-    if (byte > 0x7E) nonPrintable++;
-  }
-  // If >30% non-printable, treat as binary
-  return (nonPrintable / sample.length) > 0.3;
-}
-
 function getMappedModel(tool, model) {
   if (!model) return null;
   try {

src/shared/constants/cliTools.js

@@ -8,9 +8,12 @@ export const MITM_TOOLS = {
     description: "Google Antigravity IDE with MITM",
     configType: "mitm",
     mitmDomain: "daily-cloudcode-pa.googleapis.com",
-    modelAliases: ["gemini-3.5-flash-low", "gemini-3-flash-agent", "gemini-3.5-flash-extra-low", "gemini-3.1-pro-low", "gemini-pro-agent", "claude-sonnet-4-6", "claude-opus-4-6-thinking", "gpt-oss-120b-medium", "gemini-3-flash"],
+    modelAliases: ["gemini-3.6-flash-high", "gemini-3.6-flash-medium", "gemini-3.6-flash-low", "gemini-3.5-flash-low", "gemini-3-flash-agent", "gemini-3.5-flash-extra-low", "gemini-3.1-pro-low", "gemini-pro-agent", "claude-sonnet-4-6", "claude-opus-4-6-thinking", "gpt-oss-120b-medium", "gemini-3-flash"],
     defaultModels: [
-      { id: "gemini-3.5-flash-low", name: "Gemini 3.5 Flash (Medium) / Default", alias: "gemini-3.5-flash-low" },
+      { id: "gemini-3.6-flash-high", name: "Gemini 3.6 Flash (High)", alias: "gemini-3.6-flash-high" },
+      { id: "gemini-3.6-flash-medium", name: "Gemini 3.6 Flash (Medium)", alias: "gemini-3.6-flash-medium" },
+      { id: "gemini-3.6-flash-low", name: "Gemini 3.6 Flash (Low)", alias: "gemini-3.6-flash-low" },
+      { id: "gemini-3.5-flash-low", name: "Gemini 3.5 Flash (Medium) / Default", alias: "gemini-3.5-flash-low", mandatory: true },
       { id: "gemini-3-flash-agent", name: "Gemini 3.5 Flash (High)", alias: "gemini-3-flash-agent" },
       { id: "gemini-3.5-flash-extra-low", name: "Gemini 3.5 Flash (Low)", alias: "gemini-3.5-flash-extra-low" },
       { id: "gemini-3.1-pro-low", name: "Gemini 3.1 Pro (Low)", alias: "gemini-3.1-pro-low" },

src/sse/handlers/chat.js

@@ -219,7 +219,7 @@ async function handleSingleModelChat(body, modelStr, clientRawRequest = null, re
 
     // Ensure real project ID is available for providers that need it (P0 fix: cold miss)
     if ((provider === "antigravity" || provider === "gemini-cli") && !refreshedCredentials.projectId) {
-      const pid = await getProjectIdForConnection(credentials.connectionId, refreshedCredentials.accessToken);
+      const pid = await getProjectIdForConnection(credentials.connectionId, refreshedCredentials.accessToken, provider);
       if (pid) {
         refreshedCredentials.projectId = pid;
         // Persist to DB in background so subsequent requests have it immediately

tests/__baseline__/known-fails.txt

@@ -1,4 +1,3 @@
-tests/unit/antigravity-mitm.test.js :: Antigravity MITM model handling flags the out-of-box agent/Default model mandatory
 tests/unit/claude-header-forwarding.test.js :: proxyAwareFetch — api.anthropic.com routing routes api.anthropic.com to gotScraping (non-streaming) and returns ok response
 tests/unit/oauth-cursor-auto-import.test.js :: GET /api/oauth/cursor/auto-import extracts tokens using exact keys
 tests/unit/oauth-cursor-auto-import.test.js :: GET /api/oauth/cursor/auto-import falls back to fuzzy key matching on macOS when exact keys are missing

tests/__baseline__/providers-baseline.json

@@ -25,7 +25,7 @@
   },
   "antigravity": {
     "baseUrls": [
-      "https://cloudcode-pa.googleapis.com"
+      "https://daily-cloudcode-pa.googleapis.com"
     ],
     "format": "antigravity",
     "headers": {
@@ -881,4 +881,4 @@
     },
     "format": "openai"
   }
-}
+}

tests/unit/antigravity-retry-hook.test.js

@@ -67,8 +67,8 @@ describe("antigravity computeRetryDelay hook (D3)", () => {
     expect(out.request.tools[0].functionDeclarations.map(fn => fn.name)).toEqual(["read_file"]);
   });
 
-  it("registry uses the official IDE cloudcode host and user agent", () => {
+  it("registry uses the daily IDE cloudcode host and user agent", () => {
-    expect(antigravity.transport.baseUrls).toEqual(["https://cloudcode-pa.googleapis.com"]);
+    expect(antigravity.transport.baseUrls).toEqual(["https://daily-cloudcode-pa.googleapis.com"]);
     expect(antigravity.transport.headers["User-Agent"]).toBe("antigravity/ide/2.1.1 darwin/arm64");
   });
 

tests/unit/gemini-36-integration.test.js

@@ -0,0 +1,144 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { createRequire } from "node:module";
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+
+import { getModelUpstreamId } from "../../open-sse/config/providerModels.js";
+import { AntigravityExecutor } from "../../open-sse/executors/antigravity.js";
+import { applyThinking, stripThinkingSuffix } from "../../open-sse/translator/concerns/thinkingUnified.js";
+import antigravity from "../../open-sse/providers/registry/antigravity.js";
+import geminiCli from "../../open-sse/providers/registry/gemini-cli.js";
+import gemini from "../../open-sse/providers/registry/gemini.js";
+import { MODEL_PRICING } from "../../open-sse/providers/pricing.js";
+import {
+  getProjectIdForConnection,
+  removeConnection,
+} from "../../open-sse/services/projectId.js";
+
+const require = createRequire(import.meta.url);
+const mitmConfig = require("../../src/mitm/config.js");
+const here = dirname(fileURLToPath(import.meta.url));
+
+function cloudCodeResponse(projectId) {
+  return {
+    ok: true,
+    json: async () => ({ cloudaicompanionProject: { id: projectId } }),
+  };
+}
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+describe("Gemini Cloud Code endpoint isolation", () => {
+  it("keeps Gemini CLI on the official cloudcode host", async () => {
+    const connectionId = "gemini-cli-endpoint-test";
+    const fetchMock = vi.fn(async () => cloudCodeResponse("gemini-project"));
+    vi.stubGlobal("fetch", fetchMock);
+
+    await getProjectIdForConnection(connectionId, "token", "gemini-cli");
+
+    expect(fetchMock).toHaveBeenCalledWith(
+      "https://cloudcode-pa.googleapis.com/v1internal:loadCodeAssist",
+      expect.objectContaining({ method: "POST" })
+    );
+    expect(geminiCli.transport.baseUrl).toBe("https://cloudcode-pa.googleapis.com/v1internal");
+    removeConnection(connectionId);
+  });
+
+  it("uses the prod cloudcode host for Antigravity discovery but daily for chat", async () => {
+    const connectionId = "antigravity-endpoint-test";
+    const fetchMock = vi.fn(async () => cloudCodeResponse("antigravity-project"));
+    vi.stubGlobal("fetch", fetchMock);
+
+    await getProjectIdForConnection(connectionId, "token", "antigravity");
+
+    // Discovery (loadCodeAssist) on PROD — daily host rejects auth/onboarding calls.
+    expect(fetchMock).toHaveBeenCalledWith(
+      "https://cloudcode-pa.googleapis.com/v1internal:loadCodeAssist",
+      expect.objectContaining({ method: "POST" })
+    );
+    // Chat transport still uses the daily host to bypass prod 429.
+    expect(antigravity.transport.baseUrls).toEqual(["https://daily-cloudcode-pa.googleapis.com"]);
+    removeConnection(connectionId);
+  });
+});
+
+describe("Gemini 3.6 Antigravity tiers", () => {
+  it.each(["high", "medium", "low"])(
+    "maps the %s tier to the shared upstream model with matching thinking level",
+    (tier) => {
+      const publicModel = `gemini-3.6-flash-${tier}`;
+      const upstreamModel = getModelUpstreamId("ag", publicModel);
+      const body = {
+        model: stripThinkingSuffix(upstreamModel),
+        request: {
+          contents: [{ role: "user", parts: [{ text: "hello" }] }],
+          generationConfig: {},
+        },
+      };
+
+      applyThinking("antigravity", upstreamModel, body, "antigravity");
+      const finalBody = new AntigravityExecutor().transformRequest(
+        publicModel,
+        body,
+        true,
+        { projectId: "project", connectionId: "connection" }
+      );
+
+      expect(upstreamModel).toBe(`gemini-3.6-flash-tiered(${tier})`);
+      expect(finalBody.model).toBe("gemini-3.6-flash-tiered");
+      expect(finalBody.request.generationConfig.thinkingConfig).toEqual({
+        thinkingLevel: tier,
+        includeThoughts: true,
+      });
+    }
+  );
+});
+
+describe("Gemini 3.6 MITM model extraction", () => {
+  it("exports the model extractor from the side-effect-free MITM config module", () => {
+    expect(mitmConfig.extractModel).toBeTypeOf("function");
+  });
+
+  it.each(["high", "medium", "low"])("extracts the %s thinking tier", (tier) => {
+    const body = Buffer.from(JSON.stringify({
+      request: { generationConfig: { thinkingConfig: { thinkingLevel: tier } } },
+    }));
+
+    expect(mitmConfig.extractModel(
+      "/v1internal/models/gemini-3.6-flash-tiered:streamGenerateContent",
+      body
+    )).toBe(`gemini-3.6-flash-${tier}`);
+  });
+
+  it("defaults invalid or missing thinking levels to medium", () => {
+    const body = Buffer.from(JSON.stringify({
+      request: { generationConfig: { thinkingConfig: { thinkingLevel: "unknown" } } },
+    }));
+
+    expect(mitmConfig.extractModel(
+      "/v1internal/models/gemini-3.6-flash-tiered:streamGenerateContent",
+      body
+    )).toBe("gemini-3.6-flash-medium");
+  });
+});
+
+describe("Gemini 3.6 catalogs and pricing", () => {
+  it("exposes the direct Gemini API models and their pricing", () => {
+    const ids = gemini.models.map((model) => model.id);
+    expect(ids).toContain("gemini-3.6-flash");
+    expect(ids).toContain("gemini-3.5-flash-lite");
+    expect(MODEL_PRICING["gemini-3.6-flash"]).toMatchObject({ input: 1.5, output: 7.5 });
+    expect(MODEL_PRICING["gemini-3.5-flash-lite"]).toMatchObject({ input: 0.3, output: 2.5 });
+  });
+
+  it("keeps the standalone CLI Gemini catalog synchronized", () => {
+    const source = readFileSync(join(here, "../../cli/src/cli/menus/providers.js"), "utf8");
+    const geminiCatalog = source.match(/\n  gemini: \[([\s\S]*?)\n  \],/)?.[1] || "";
+
+    expect(geminiCatalog).toContain("gemini-3.6-flash");
+    expect(geminiCatalog).toContain("gemini-3.5-flash-lite");
+  });
+});