diff --git a/CHANGELOG.md b/CHANGELOG.md
index 421143bbf0b..76026b802ab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@ Docs: https://docs.openclaw.ai
 - iOS/App Store Connect release prep: align iOS bundle identifiers under `ai.openclaw.client`, refresh Watch app icons, add Fastlane metadata/screenshot automation, and support Keychain-backed ASC auth for uploads. (#38936) Thanks @ngutman.
 - Mattermost/model picker: add Telegram-style interactive provider/model browsing for `/oc_model` and `/oc_models`, fix picker callback updates, and emit a normal confirmation reply when a model is selected. (#38767) thanks @mukhtharcm.
 - Docker/multi-stage build: restructure Dockerfile as a multi-stage build to produce a minimal runtime image without build tools, source code, or Bun; add `OPENCLAW_VARIANT=slim` build arg for a bookworm-slim variant. (#38479) Thanks @sallyom.
+- Google/Gemini 3.1 Flash-Lite: add first-class `google/gemini-3.1-flash-lite-preview` support across model-id normalization, default aliases, media-understanding image lookups, Google Gemini CLI forward-compat fallback, and docs.
 
 ### Breaking
 
diff --git a/docs/concepts/model-providers.md b/docs/concepts/model-providers.md
index dec03850189..6dd4c2f9c03 100644
--- a/docs/concepts/model-providers.md
+++ b/docs/concepts/model-providers.md
@@ -104,8 +104,8 @@ OpenClaw ships with the pi‑ai catalog. These providers require **no**
 - Provider: `google`
 - Auth: `GEMINI_API_KEY`
 - Optional rotation: `GEMINI_API_KEYS`, `GEMINI_API_KEY_1`, `GEMINI_API_KEY_2`, `GOOGLE_API_KEY` fallback, and `OPENCLAW_LIVE_GEMINI_KEY` (single override)
-- Example models: `google/gemini-3.1-pro-preview`, `google/gemini-3-flash-preview`
-- Compatibility: legacy OpenClaw config using `google/gemini-3.1-flash-preview` is normalized to `google/gemini-3-flash-preview`
+- Example models: `google/gemini-3.1-pro-preview`, `google/gemini-3-flash-preview`, `google/gemini-3.1-flash-lite-preview`
+- Compatibility: legacy OpenClaw config using `google/gemini-3.1-flash-preview` is normalized to `google/gemini-3-flash-preview`, and bare `google/gemini-3.1-flash-lite` is normalized to `google/gemini-3.1-flash-lite-preview`
 - CLI: `openclaw onboard --auth-choice gemini-api-key`
 
 ### Google Vertex, Antigravity, and Gemini CLI
diff --git a/docs/gateway/configuration-reference.md b/docs/gateway/configuration-reference.md
index ceae117c81a..c69d5a373b0 100644
--- a/docs/gateway/configuration-reference.md
+++ b/docs/gateway/configuration-reference.md
@@ -910,14 +910,15 @@ Time format in system prompt. Default: `auto` (OS preference).
 
 **Built-in alias shorthands** (only apply when the model is in `agents.defaults.models`):
 
-| Alias          | Model                           |
-| -------------- | ------------------------------- |
-| `opus`         | `anthropic/claude-opus-4-6`     |
-| `sonnet`       | `anthropic/claude-sonnet-4-5`   |
-| `gpt`          | `openai/gpt-5.2`                |
-| `gpt-mini`     | `openai/gpt-5-mini`             |
-| `gemini`       | `google/gemini-3.1-pro-preview` |
-| `gemini-flash` | `google/gemini-3-flash-preview` |
+| Alias               | Model                                  |
+| ------------------- | -------------------------------------- |
+| `opus`              | `anthropic/claude-opus-4-6`            |
+| `sonnet`            | `anthropic/claude-sonnet-4-6`          |
+| `gpt`               | `openai/gpt-5.4`                       |
+| `gpt-mini`          | `openai/gpt-5-mini`                    |
+| `gemini`            | `google/gemini-3.1-pro-preview`        |
+| `gemini-flash`      | `google/gemini-3-flash-preview`        |
+| `gemini-flash-lite` | `google/gemini-3.1-flash-lite-preview` |
 
 Your configured aliases always win over defaults.
 
diff --git a/docs/help/faq.md b/docs/help/faq.md
index 2a669c6f683..0ea9c4d92d5 100644
--- a/docs/help/faq.md
+++ b/docs/help/faq.md
@@ -2238,11 +2238,12 @@ Docs: [Models](/concepts/models), [Multi-Agent Routing](/concepts/multi-agent),
 Yes. OpenClaw ships a few default shorthands (only applied when the model exists in `agents.defaults.models`):
 
 - `opus` → `anthropic/claude-opus-4-6`
-- `sonnet` → `anthropic/claude-sonnet-4-5`
-- `gpt` → `openai/gpt-5.2`
+- `sonnet` → `anthropic/claude-sonnet-4-6`
+- `gpt` → `openai/gpt-5.4`
 - `gpt-mini` → `openai/gpt-5-mini`
 - `gemini` → `google/gemini-3.1-pro-preview`
 - `gemini-flash` → `google/gemini-3-flash-preview`
+- `gemini-flash-lite` → `google/gemini-3.1-flash-lite-preview`
 
 If you set your own alias with the same name, your value wins.
 
diff --git a/src/agents/model-selection.test.ts b/src/agents/model-selection.test.ts
index 08ae7f1c7e2..a9029540ee1 100644
--- a/src/agents/model-selection.test.ts
+++ b/src/agents/model-selection.test.ts
@@ -125,6 +125,17 @@ describe("model-selection", () => {
       });
     });
 
+    it("normalizes gemini 3.1 flash-lite to the preview model id", () => {
+      expect(parseModelRef("google/gemini-3.1-flash-lite", "openai")).toEqual({
+        provider: "google",
+        model: "gemini-3.1-flash-lite-preview",
+      });
+      expect(parseModelRef("gemini-3.1-flash-lite", "google")).toEqual({
+        provider: "google",
+        model: "gemini-3.1-flash-lite-preview",
+      });
+    });
+
     it("keeps openai gpt-5.3 codex refs on the openai provider", () => {
       expect(parseModelRef("openai/gpt-5.3-codex", "anthropic")).toEqual({
         provider: "openai",
diff --git a/src/agents/models-config.providers.google-antigravity.test.ts b/src/agents/models-config.providers.google-antigravity.test.ts
index 2d073cf362e..3886b237e27 100644
--- a/src/agents/models-config.providers.google-antigravity.test.ts
+++ b/src/agents/models-config.providers.google-antigravity.test.ts
@@ -53,6 +53,10 @@ describe("normalizeGoogleModelId", () => {
     expect(normalizeGoogleModelId("gemini-3.1-flash")).toBe("gemini-3-flash-preview");
     expect(normalizeGoogleModelId("gemini-3.1-flash-preview")).toBe("gemini-3-flash-preview");
   });
+
+  it("adds the preview suffix for gemini 3.1 flash-lite", () => {
+    expect(normalizeGoogleModelId("gemini-3.1-flash-lite")).toBe("gemini-3.1-flash-lite-preview");
+  });
 });
 
 describe("google-antigravity provider normalization", () => {
diff --git a/src/agents/models-config.providers.ts b/src/agents/models-config.providers.ts
index 19e386b0d22..f88df714b72 100644
--- a/src/agents/models-config.providers.ts
+++ b/src/agents/models-config.providers.ts
@@ -547,6 +547,9 @@ export function normalizeGoogleModelId(id: string): string {
   if (id === "gemini-3.1-pro") {
     return "gemini-3.1-pro-preview";
   }
+  if (id === "gemini-3.1-flash-lite") {
+    return "gemini-3.1-flash-lite-preview";
+  }
   // Preserve compatibility with earlier OpenClaw docs/config that pointed at a
   // non-existent Gemini Flash preview ID. Google's current Flash text model is
   // `gemini-3-flash-preview`.
diff --git a/src/agents/pi-embedded-runner/model.forward-compat.test.ts b/src/agents/pi-embedded-runner/model.forward-compat.test.ts
index 56fd4654e91..310f62d0d32 100644
--- a/src/agents/pi-embedded-runner/model.forward-compat.test.ts
+++ b/src/agents/pi-embedded-runner/model.forward-compat.test.ts
@@ -89,6 +89,19 @@ describe("pi embedded model e2e smoke", () => {
     });
   });
 
+  it("builds a google-gemini-cli forward-compat fallback for gemini-3.1-flash-lite-preview", () => {
+    mockGoogleGeminiCliFlashTemplateModel();
+
+    const result = resolveModel("google-gemini-cli", "gemini-3.1-flash-lite-preview", "/tmp/agent");
+    expect(result.error).toBeUndefined();
+    expect(result.model).toMatchObject({
+      ...GOOGLE_GEMINI_CLI_FLASH_TEMPLATE_MODEL,
+      id: "gemini-3.1-flash-lite-preview",
+      name: "gemini-3.1-flash-lite-preview",
+      reasoning: true,
+    });
+  });
+
   it("keeps unknown-model errors for unrecognized google-gemini-cli model IDs", () => {
     const result = resolveModel("google-gemini-cli", "gemini-4-unknown", "/tmp/agent");
     expect(result.model).toBeUndefined();
diff --git a/src/cli/daemon-cli/lifecycle.test.ts b/src/cli/daemon-cli/lifecycle.test.ts
index f1e87fc4938..3f0ed6d531c 100644
--- a/src/cli/daemon-cli/lifecycle.test.ts
+++ b/src/cli/daemon-cli/lifecycle.test.ts
@@ -36,16 +36,17 @@ const renderGatewayPortHealthDiagnostics = vi.fn(() => ["diag: unhealthy port"])
 const renderRestartDiagnostics = vi.fn(() => ["diag: unhealthy runtime"]);
 const resolveGatewayPort = vi.fn(() => 18789);
 const findGatewayPidsOnPortSync = vi.fn<(port: number) => number[]>(() => []);
-const probeGateway = vi.fn<
-  (opts: {
-    url: string;
-    auth?: { token?: string; password?: string };
-    timeoutMs: number;
-  }) => Promise<{
-    ok: boolean;
-    configSnapshot: unknown;
-  }>
->();
+const probeGateway =
+  vi.fn<
+    (opts: {
+      url: string;
+      auth?: { token?: string; password?: string };
+      timeoutMs: number;
+    }) => Promise<{
+      ok: boolean;
+      configSnapshot: unknown;
+    }>
+  >();
 const isRestartEnabled = vi.fn<(config?: { commands?: unknown }) => boolean>(() => true);
 const loadConfig = vi.fn(() => ({}));
 
diff --git a/src/config/defaults.ts b/src/config/defaults.ts
index e9e1a02c1f8..b8e20f260a1 100644
--- a/src/config/defaults.ts
+++ b/src/config/defaults.ts
@@ -30,6 +30,7 @@ const DEFAULT_MODEL_ALIASES: Readonly<Record<string, string>> = {
   // Google Gemini (3.x are preview ids in the catalog)
   gemini: "google/gemini-3.1-pro-preview",
   "gemini-flash": "google/gemini-3-flash-preview",
+  "gemini-flash-lite": "google/gemini-3.1-flash-lite-preview",
 };
 
 const DEFAULT_MODEL_COST: ModelDefinitionConfig["cost"] = {
diff --git a/src/config/model-alias-defaults.test.ts b/src/config/model-alias-defaults.test.ts
index 1d844b4d1b4..96bcd611233 100644
--- a/src/config/model-alias-defaults.test.ts
+++ b/src/config/model-alias-defaults.test.ts
@@ -69,6 +69,7 @@ describe("applyModelDefaults", () => {
           models: {
             "google/gemini-3.1-pro-preview": { alias: "" },
             "google/gemini-3-flash-preview": {},
+            "google/gemini-3.1-flash-lite-preview": {},
           },
         },
       },
@@ -80,6 +81,9 @@ describe("applyModelDefaults", () => {
     expect(next.agents?.defaults?.models?.["google/gemini-3-flash-preview"]?.alias).toBe(
       "gemini-flash",
     );
+    expect(next.agents?.defaults?.models?.["google/gemini-3.1-flash-lite-preview"]?.alias).toBe(
+      "gemini-flash-lite",
+    );
   });
 
   it("fills missing model provider defaults", () => {
diff --git a/src/media-understanding/providers/image.test.ts b/src/media-understanding/providers/image.test.ts
index 80737f3f410..51c8739f43a 100644
--- a/src/media-understanding/providers/image.test.ts
+++ b/src/media-understanding/providers/image.test.ts
@@ -130,4 +130,104 @@ describe("describeImageWithModel", () => {
     expect(completeMock).toHaveBeenCalledOnce();
     expect(minimaxUnderstandImageMock).not.toHaveBeenCalled();
   });
+
+  it("normalizes deprecated google flash ids before lookup and keeps profile auth selection", async () => {
+    const findMock = vi.fn((provider: string, modelId: string) => {
+      expect(provider).toBe("google");
+      expect(modelId).toBe("gemini-3-flash-preview");
+      return {
+        provider: "google",
+        id: "gemini-3-flash-preview",
+        input: ["text", "image"],
+        baseUrl: "https://generativelanguage.googleapis.com/v1beta",
+      };
+    });
+    discoverModelsMock.mockReturnValue({ find: findMock });
+    completeMock.mockResolvedValue({
+      role: "assistant",
+      api: "google-generative-ai",
+      provider: "google",
+      model: "gemini-3-flash-preview",
+      stopReason: "stop",
+      timestamp: Date.now(),
+      content: [{ type: "text", text: "flash ok" }],
+    });
+
+    const { describeImageWithModel } = await import("./image.js");
+
+    const result = await describeImageWithModel({
+      cfg: {},
+      agentDir: "/tmp/openclaw-agent",
+      provider: "google",
+      model: "gemini-3.1-flash-preview",
+      profile: "google:default",
+      buffer: Buffer.from("png-bytes"),
+      fileName: "image.png",
+      mime: "image/png",
+      prompt: "Describe the image.",
+      timeoutMs: 1000,
+    });
+
+    expect(result).toEqual({
+      text: "flash ok",
+      model: "gemini-3-flash-preview",
+    });
+    expect(findMock).toHaveBeenCalledOnce();
+    expect(getApiKeyForModelMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        profileId: "google:default",
+      }),
+    );
+    expect(setRuntimeApiKeyMock).toHaveBeenCalledWith("google", "oauth-test");
+  });
+
+  it("normalizes gemini 3.1 flash-lite ids before lookup and keeps profile auth selection", async () => {
+    const findMock = vi.fn((provider: string, modelId: string) => {
+      expect(provider).toBe("google");
+      expect(modelId).toBe("gemini-3.1-flash-lite-preview");
+      return {
+        provider: "google",
+        id: "gemini-3.1-flash-lite-preview",
+        input: ["text", "image"],
+        baseUrl: "https://generativelanguage.googleapis.com/v1beta",
+      };
+    });
+    discoverModelsMock.mockReturnValue({ find: findMock });
+    completeMock.mockResolvedValue({
+      role: "assistant",
+      api: "google-generative-ai",
+      provider: "google",
+      model: "gemini-3.1-flash-lite-preview",
+      stopReason: "stop",
+      timestamp: Date.now(),
+      content: [{ type: "text", text: "flash lite ok" }],
+    });
+
+    const { describeImageWithModel } = await import("./image.js");
+
+    const result = await describeImageWithModel({
+      cfg: {},
+      agentDir: "/tmp/openclaw-agent",
+      provider: "google",
+      model: "gemini-3.1-flash-lite",
+      profile: "google:default",
+      buffer: Buffer.from("png-bytes"),
+      fileName: "image.png",
+      mime: "image/png",
+      prompt: "Describe the image.",
+      timeoutMs: 1000,
+    });
+
+    expect(result).toEqual({
+      text: "flash lite ok",
+      model: "gemini-3.1-flash-lite-preview",
+    });
+    expect(findMock).toHaveBeenCalledOnce();
+    expect(getApiKeyForModelMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        profileId: "google:default",
+      }),
+    );
+    expect(setRuntimeApiKeyMock).toHaveBeenCalledWith("google", "oauth-test");
+  });
 });
diff --git a/src/media-understanding/providers/image.ts b/src/media-understanding/providers/image.ts
index 79c36292f0c..1511a7c9bb9 100644
--- a/src/media-understanding/providers/image.ts
+++ b/src/media-understanding/providers/image.ts
@@ -2,6 +2,7 @@ import type { Api, Context, Model } from "@mariozechner/pi-ai";
 import { complete } from "@mariozechner/pi-ai";
 import { isMinimaxVlmModel, minimaxUnderstandImage } from "../../agents/minimax-vlm.js";
 import { getApiKeyForModel, requireApiKey } from "../../agents/model-auth.js";
+import { normalizeModelRef } from "../../agents/model-selection.js";
 import { ensureOpenClawModelsJson } from "../../agents/models-config.js";
 import { coerceImageAssistantText } from "../../agents/tools/image-tool.helpers.js";
 import type { ImageDescriptionRequest, ImageDescriptionResult } from "../types.js";
@@ -22,9 +23,11 @@ export async function describeImageWithModel(
   const { discoverAuthStorage, discoverModels } = await loadPiModelDiscoveryRuntime();
   const authStorage = discoverAuthStorage(params.agentDir);
   const modelRegistry = discoverModels(authStorage, params.agentDir);
-  const model = modelRegistry.find(params.provider, params.model) as Model<Api> | null;
+  // Keep direct media config entries compatible with deprecated provider model aliases.
+  const resolvedRef = normalizeModelRef(params.provider, params.model);
+  const model = modelRegistry.find(resolvedRef.provider, resolvedRef.model) as Model<Api> | null;
   if (!model) {
-    throw new Error(`Unknown model: ${params.provider}/${params.model}`);
+    throw new Error(`Unknown model: ${resolvedRef.provider}/${resolvedRef.model}`);
   }
   if (!model.input?.includes("image")) {
     throw new Error(`Model does not support images: ${params.provider}/${params.model}`);