diff --git a/src/apphosting/backend.spec.ts b/src/apphosting/backend.spec.ts
index 24892b8815c..1f9e7eb0bc4 100644
--- a/src/apphosting/backend.spec.ts
+++ b/src/apphosting/backend.spec.ts
@@ -18,7 +18,6 @@ import {
 } from "./backend";
 import * as deploymentTool from "../deploymentTool";
 import { FirebaseError } from "../error";
-import * as experiments from "../experiments";
 
 describe("apphosting setup functions", () => {
   const projectId = "projectId";
@@ -67,7 +66,6 @@ describe("apphosting setup functions", () => {
     testResourceIamPermissionsStub = sinon
       .stub(iam, "testResourceIamPermissions")
       .throws("Unexpected testResourceIamPermissions call");
-    sinon.stub(experiments, "isEnabled").returns(false).withArgs("abiu").returns(true);
   });
 
   afterEach(() => {
diff --git a/src/apphosting/backend.ts b/src/apphosting/backend.ts
index 74097355659..85f828dea93 100644
--- a/src/apphosting/backend.ts
+++ b/src/apphosting/backend.ts
@@ -28,7 +28,7 @@ import * as ora from "ora";
 import fetch from "node-fetch";
 import { orchestrateRollout } from "./rollout";
 import * as fuzzy from "fuzzy";
-import { isEnabled } from "../experiments";
+
 import { resolveRuntime } from "./prompts";
 
 const DEFAULT_COMPUTE_SERVICE_ACCOUNT_NAME = "firebase-app-hosting-compute";
@@ -387,10 +387,7 @@ export async function createBackend(
     appId: webAppId,
   };
 
-  // this is to be extra careful that we do not set the ABIU fields if the experiment is disabled
-  if (isEnabled("abiu")) {
-    backendReqBody.runtime = { value: runtime ?? "" };
-  }
+  backendReqBody.runtime = { value: runtime ?? "" };
 
   async function createBackendAndPoll(): Promise<apphosting.Backend> {
     const op = await apphosting.createBackend(projectId, location, backendReqBody, backendId);
diff --git a/src/apphosting/prompts.spec.ts b/src/apphosting/prompts.spec.ts
index 6d523e3b1c6..0409dc02e8a 100644
--- a/src/apphosting/prompts.spec.ts
+++ b/src/apphosting/prompts.spec.ts
@@ -1,7 +1,6 @@
 import * as sinon from "sinon";
 import { expect } from "chai";
 import * as prompts from "./prompts";
-import * as experiments from "../experiments";
 import * as apphosting from "../gcp/apphosting";
 import * as promptImport from "../prompt";
 
@@ -9,12 +8,10 @@ describe("prompts", () => {
   const projectId = "projectId";
   const location = "us-central1";
 
-  let isEnabledStub: sinon.SinonStub;
   let listSupportedRuntimesStub: sinon.SinonStub;
   let selectStub: sinon.SinonStub;
 
   beforeEach(() => {
-    isEnabledStub = sinon.stub(experiments, "isEnabled");
     listSupportedRuntimesStub = sinon.stub(apphosting, "listSupportedRuntimes");
     selectStub = sinon.stub(promptImport, "select");
   });
@@ -29,20 +26,12 @@ describe("prompts", () => {
       expect(result).to.equal("nodejs22");
     });
 
-    it("should return undefined if abiu experiment is disabled", async () => {
-      isEnabledStub.withArgs("abiu").returns(false);
-      const result = await prompts.resolveRuntime(projectId, location, false);
-      expect(result).to.be.undefined;
-    });
-
     it("should return DEFAULT_RUNTIME in non-interactive mode", async () => {
-      isEnabledStub.withArgs("abiu").returns(true);
       const result = await prompts.resolveRuntime(projectId, location, true);
       expect(result).to.equal(prompts.DEFAULT_RUNTIME);
     });
 
     it("should call promptRuntime and return selected runtime in interactive mode", async () => {
-      isEnabledStub.withArgs("abiu").returns(true);
       listSupportedRuntimesStub.resolves([
         { runtimeId: "nodejs22", automaticBaseImageUpdatesSupported: true },
       ]);
diff --git a/src/apphosting/prompts.ts b/src/apphosting/prompts.ts
index e59ea5fdfa6..c9ecf1d0729 100644
--- a/src/apphosting/prompts.ts
+++ b/src/apphosting/prompts.ts
@@ -1,7 +1,6 @@
 import { select, Choice } from "../prompt";
 import { logWarning, logBullet } from "../utils";
 import * as apphosting from "../gcp/apphosting";
-import { isEnabled } from "../experiments";
 
 export const DEFAULT_RUNTIME = "nodejs";
 
@@ -60,9 +59,6 @@ export async function resolveRuntime(
   if (runtimeOption !== undefined) {
     return runtimeOption;
   }
-  if (!isEnabled("abiu")) {
-    return undefined;
-  }
   if (nonInteractive) {
     return DEFAULT_RUNTIME;
   }
diff --git a/src/commands/apphosting-backends-create.spec.ts b/src/commands/apphosting-backends-create.spec.ts
index 9f1ef6d061e..33bbec40595 100644
--- a/src/commands/apphosting-backends-create.spec.ts
+++ b/src/commands/apphosting-backends-create.spec.ts
@@ -3,19 +3,15 @@ import { expect } from "chai";
 import { Command } from "../command";
 import { command as apphostingBackendsCreate } from "./apphosting-backends-create";
 import * as backend from "../apphosting/backend";
-import * as experiments from "../experiments";
-import { FirebaseError } from "../error";
 
 describe("apphosting:backends:create", () => {
   const PROJECT_ID = "test-project";
   let command: Command;
-  let isEnabledStub: sinon.SinonStub;
   let doSetupStub: sinon.SinonStub;
 
   beforeEach(() => {
     command = apphostingBackendsCreate;
     (command as unknown as { befores: unknown[] }).befores = []; // Bypass pre-action hooks for unit testing action
-    isEnabledStub = sinon.stub(experiments, "isEnabled");
     doSetupStub = sinon.stub(backend, "doSetup").resolves();
   });
 
@@ -23,23 +19,7 @@ describe("apphosting:backends:create", () => {
     sinon.restore();
   });
 
-  it("should fail if runtime flag is used without experiment enabled", async () => {
-    isEnabledStub.returns(false);
-    const options = {
-      project: PROJECT_ID,
-      runtime: "nodejs22",
-      backend: "test-backend",
-      primaryRegion: "us-central1",
-    };
-
-    await expect(command.runner()(options)).to.be.rejectedWith(
-      FirebaseError,
-      /The --runtime flag is only available when the 'abiu' experiment is enabled/,
-    );
-  });
-
-  it("should default runtime to undefined when experiment is on and no flag provided", async () => {
-    isEnabledStub.returns(true);
+  it("should default runtime to undefined when no flag provided", async () => {
     const options = {
       project: PROJECT_ID,
       nonInteractive: true,
@@ -63,7 +43,6 @@ describe("apphosting:backends:create", () => {
   });
 
   it("should pass explicit empty runtime", async () => {
-    isEnabledStub.returns(true);
     const options = {
       project: PROJECT_ID,
       nonInteractive: true,
@@ -88,7 +67,6 @@ describe("apphosting:backends:create", () => {
   });
 
   it("should pass explicit runtime", async () => {
-    isEnabledStub.returns(true);
     const options = {
       project: PROJECT_ID,
       nonInteractive: true,
@@ -113,7 +91,6 @@ describe("apphosting:backends:create", () => {
   });
 
   it("should default runtime if flag is present without value (boolean true)", async () => {
-    isEnabledStub.returns(true);
     const options = {
       project: PROJECT_ID,
       nonInteractive: true,
diff --git a/src/commands/apphosting-backends-create.ts b/src/commands/apphosting-backends-create.ts
index 5d3389c4caf..8babdca11c2 100644
--- a/src/commands/apphosting-backends-create.ts
+++ b/src/commands/apphosting-backends-create.ts
@@ -5,7 +5,7 @@ import { needProjectId } from "../projectUtils";
 import { requireAuth } from "../requireAuth";
 import { doSetup } from "../apphosting/backend";
 import { ensureApiEnabled } from "../gcp/apphosting";
-import * as experiments from "../experiments";
+
 import { APPHOSTING_TOS_ID } from "../gcp/firedata";
 import { requireTosAcceptance } from "../requireTosAcceptance";
 
@@ -29,13 +29,10 @@ export const command = new Command("apphosting:backends:create")
     "specify the primary region for the backend. Required with --non-interactive.",
   )
   .option("--root-dir <rootDir>", "specify the root directory for the backend.");
-const abiuEnabled = experiments.isEnabled("abiu");
-if (abiuEnabled) {
-  command.option(
-    "--runtime [runtime]",
-    "specify the runtime for the backend (e.g., nodejs, nodejs22)",
-  );
-}
+command.option(
+  "--runtime [runtime]",
+  "specify the runtime for the backend (e.g., nodejs, nodejs22)",
+);
 
 command
   .before(requireAuth)
@@ -47,16 +44,9 @@ command
       throw new FirebaseError(`--non-interactive option requires --backend and --primary-region`);
     }
 
-    const abiuAllowed = experiments.isEnabled("abiu");
-    if (!abiuAllowed && options.runtime) {
-      throw new FirebaseError(
-        "The --runtime flag is only available when the 'abiu' experiment is enabled. To enable it, run 'firebase experiments:enable abiu'.",
-      );
-    }
-    // When ABIU is allowed but the user doesn't provide a runtime string, we let doSetup handle it.
+    // When the user doesn't provide a runtime string, we let doSetup handle it.
     // We strictly check for string type to avoid boolean true (flag present without value) causing issues.
-    const runtime =
-      abiuAllowed && typeof options.runtime === "string" ? options.runtime : undefined;
+    const runtime = typeof options.runtime === "string" ? options.runtime : undefined;
 
     return doSetup(
       projectId,
diff --git a/src/commands/apphosting-backends-list.spec.ts b/src/commands/apphosting-backends-list.spec.ts
index 3a585e4ca29..df013a87da0 100644
--- a/src/commands/apphosting-backends-list.spec.ts
+++ b/src/commands/apphosting-backends-list.spec.ts
@@ -2,16 +2,13 @@ import * as sinon from "sinon";
 import { expect } from "chai";
 import { logger } from "../logger";
 import { printBackendsTable } from "./apphosting-backends-list";
-import * as experiments from "../experiments";
 import * as apphosting from "../gcp/apphosting";
 
 describe("apphosting:backends:list printBackendsTable", () => {
   let loggerStub: sinon.SinonStub;
-  let isEnabledStub: sinon.SinonStub;
 
   beforeEach(() => {
     loggerStub = sinon.stub(logger, "info");
-    isEnabledStub = sinon.stub(experiments, "isEnabled");
   });
 
   afterEach(() => {
@@ -19,7 +16,6 @@ describe("apphosting:backends:list printBackendsTable", () => {
   });
 
   it("should display Disabled if automaticBaseImageUpdatesDisabled is true", () => {
-    isEnabledStub.withArgs("abiu").returns(true);
     const mockBackend: Partial<apphosting.Backend> = {
       name: "projects/test-project/locations/us-central1/backends/test-backend",
       uri: "https://test-backend.app",
@@ -35,7 +31,6 @@ describe("apphosting:backends:list printBackendsTable", () => {
   });
 
   it("should display Enabled if automaticBaseImageUpdatesDisabled is false", () => {
-    isEnabledStub.withArgs("abiu").returns(true);
     const mockBackend: Partial<apphosting.Backend> = {
       name: "projects/test-project/locations/us-central1/backends/test-backend",
       uri: "https://test-backend.app",
@@ -51,7 +46,6 @@ describe("apphosting:backends:list printBackendsTable", () => {
   });
 
   it("should fallback to Disabled if automaticBaseImageUpdatesDisabled is missing and runtime is legacy", () => {
-    isEnabledStub.withArgs("abiu").returns(true);
     const mockBackend: Partial<apphosting.Backend> = {
       name: "projects/test-project/locations/us-central1/backends/test-backend",
       uri: "https://test-backend.app",
@@ -66,7 +60,6 @@ describe("apphosting:backends:list printBackendsTable", () => {
   });
 
   it("should fallback to Enabled if automaticBaseImageUpdatesDisabled is missing and runtime is new", () => {
-    isEnabledStub.withArgs("abiu").returns(true);
     const mockBackend: Partial<apphosting.Backend> = {
       name: "projects/test-project/locations/us-central1/backends/test-backend",
       uri: "https://test-backend.app",
diff --git a/src/commands/apphosting-backends-list.ts b/src/commands/apphosting-backends-list.ts
index 65108863170..a4cc1a3063c 100644
--- a/src/commands/apphosting-backends-list.ts
+++ b/src/commands/apphosting-backends-list.ts
@@ -6,7 +6,7 @@ import { needProjectId } from "../projectUtils";
 import { requireAuth } from "../requireAuth";
 import { Options } from "../options";
 import * as apphosting from "../gcp/apphosting";
-import { isEnabled } from "../experiments";
+
 import * as Table from "cli-table3";
 
 export const command = new Command("apphosting:backends:list")
@@ -35,12 +35,7 @@ export const command = new Command("apphosting:backends:list")
  * Prints a table given a list of backends
  */
 export function printBackendsTable(backends: apphosting.Backend[]): void {
-  const abiuEnabled = isEnabled("abiu");
-  const head = ["Backend", "Repository", "URL", "Primary Region"];
-  if (abiuEnabled) {
-    head.push("ABIU");
-    head.push("Runtime");
-  }
+  const head = ["Backend", "Repository", "URL", "Primary Region", "ABIU", "Runtime"];
   head.push("Updated Date");
 
   const table = new Table({
@@ -57,18 +52,16 @@ export function printBackendsTable(backends: apphosting.Backend[]): void {
       backend.uri.startsWith("https:") ? backend.uri : "https://" + backend.uri,
       location,
     ];
-    if (abiuEnabled) {
-      let abiuStatus = "N/A";
-      const runtimeValue = backend.runtime?.value ?? "";
-      // We know these runtimes do not support ABIU
-      if (runtimeValue === "" || runtimeValue === "nodejs") {
-        abiuStatus = "Disabled";
-      } else {
-        abiuStatus = backend.automaticBaseImageUpdatesDisabled ? "Disabled" : "Enabled";
-      }
-      row.push(abiuStatus);
-      row.push(backend.runtime?.value ?? "N/A");
+    let abiuStatus = "N/A";
+    const runtimeValue = backend.runtime?.value ?? "";
+    // We know these runtimes do not support ABIU
+    if (runtimeValue === "" || runtimeValue === "nodejs") {
+      abiuStatus = "Disabled";
+    } else {
+      abiuStatus = backend.automaticBaseImageUpdatesDisabled ? "Disabled" : "Enabled";
     }
+    row.push(abiuStatus);
+    row.push(backend.runtime?.value ?? "N/A");
     row.push(datetimeString(new Date(backend.updateTime)));
     table.push(row);
   }
diff --git a/src/experiments.ts b/src/experiments.ts
index 5daa8e826b3..47f42bd33ea 100644
--- a/src/experiments.ts
+++ b/src/experiments.ts
@@ -149,13 +149,6 @@ export const ALL_EXPERIMENTS = experiments({
     public: false,
   },
 
-  abiu: {
-    shortDescription:
-      "Enable Automatic Base Image Updates (ABIU) and runtime selection for App Hosting",
-    default: true,
-    public: true,
-  },
-
   // TODO(joehanley): Delete this once weve scrubbed all references to experiment from docs.
   dataconnect: {
     shortDescription: "Deprecated. Previosuly, enabled SQL Connect related features.",