diff --git a/.github/config/win32.json b/.github/config/win32.json
index 9de9f00102345..4ffbc7cbb3e3a 100644
--- a/.github/config/win32.json
+++ b/.github/config/win32.json
@@ -1,6 +1,7 @@
 {
   "docker_service": "build-win-win32",
   "docker_runner_service": "runner-win-win32",
+  "runner_tag": "win32",
   "platforms": [
     "win32"
   ],
diff --git a/.github/config/xb1.json b/.github/config/xb1.json
new file mode 100644
index 0000000000000..39918cb8d5d58
--- /dev/null
+++ b/.github/config/xb1.json
@@ -0,0 +1,17 @@
+{
+  "docker_service": "build-xb1",
+  "__comment" : "TODO: Deploy a runner and change this",
+  "docker_runner_service": "runner-xb1",
+  "runner_tag": "xb1",
+  "platforms": [
+    "xb1"
+  ],
+  "includes": [
+    {
+      "name":"xb1",
+      "platform":"xb1",
+      "target_platform":"xb1",
+      "extra_gn_arguments":"is_clang=false"
+    }
+  ]
+}
diff --git a/.github/workflows/main_win.yaml b/.github/workflows/main_win.yaml
index 0b9f14be35b6d..6b455b48fde83 100644
--- a/.github/workflows/main_win.yaml
+++ b/.github/workflows/main_win.yaml
@@ -112,6 +112,11 @@ jobs:
         run: |
           docker_runner_service=$(cat ${GITHUB_WORKSPACE}/.github/config/${{ inputs.platform }}.json | jq -rc '.docker_runner_service')
           echo "docker_runner_service=${docker_runner_service}" >> $GITHUB_ENV
+      - id: set-runner-tag
+        shell: bash
+        run: |
+          runner_tag=$(cat ${GITHUB_WORKSPACE}/.github/config/${{ inputs.platform }}.json | jq -rc '.runner_tag')
+          echo "runner_tag=${runner_tag}" >> $GITHUB_ENV
     outputs:
       platforms: ${{ env.platforms }}
       includes: ${{ env.includes }}
@@ -120,6 +125,7 @@ jobs:
       on_host_test_shards: ${{ env.on_host_test_shards }}
       docker_service: ${{ env.docker_service }}
       docker_runner_service: ${{ env.docker_runner_service }}
+      runner_tag: ${{ env.runner_tag }}
   # Build windows docker images.
   build-docker-image:
     needs: [initialize]
@@ -152,7 +158,7 @@ jobs:
   build:
     needs: [initialize]
     permissions: {}
-    runs-on: [self-hosted, win32]
+    runs-on: [self-hosted, "${{ needs.initialize.outputs.runner_tag }}"]
     name: ${{matrix.name}}_${{matrix.config}}
     strategy:
       fail-fast: false
@@ -186,7 +192,7 @@ jobs:
     needs: [initialize, build]
     permissions: {}
     if: needs.initialize.outputs.on_host_test == 'true'
-    runs-on: [self-hosted, win32]
+    runs-on: [self-hosted, "${{ needs.initialize.outputs.runner_tag }}"]
     name: ${{matrix.name}}_${{matrix.shard}}_test
     strategy:
       fail-fast: false
diff --git a/.github/workflows/xb1.yaml b/.github/workflows/xb1.yaml
new file mode 100644
index 0000000000000..96e37f5514eb0
--- /dev/null
+++ b/.github/workflows/xb1.yaml
@@ -0,0 +1,32 @@
+name: xb1
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize, labeled]
+    branches:
+      - main
+      - feature/*
+  push:
+    branches:
+      - main
+      - feature/*
+  schedule:
+    # GTM timezone.
+    - cron: '0 4 * * *'
+  workflow_dispatch:
+    inputs:
+      nightly:
+        description: 'Nightly workflow.'
+        required: true
+        type: boolean
+        default: false
+
+jobs:
+  xb1:
+    uses: ./.github/workflows/main_win.yaml
+    permissions:
+      packages: write
+      pull-requests: write
+    with:
+      platform: xb1
+      nightly: ${{ github.event.inputs.nightly }}
diff --git a/docker-compose-windows.yml b/docker-compose-windows.yml
index 9c6aa27a21c6c..935cc6674deca 100644
--- a/docker-compose-windows.yml
+++ b/docker-compose-windows.yml
@@ -97,6 +97,17 @@ services:
       - cobalt-build-win32-base
     image: cobalt-build-win-win32
 
+  build-xb1:
+    <<: *common-definitions
+    build:
+      context: ./docker/windows/xb1
+      dockerfile: ./Dockerfile
+      args:
+        - FROM_IMAGE=cobalt-build-win32-base
+    depends_on:
+      - cobalt-build-win32-base
+    image: cobalt-build-xb1
+
   # -----------------------------------------
   # Win32 Platform Images for Building Cobalt
   # -----------------------------------------
@@ -115,6 +126,16 @@ services:
       PLATFORM: win-win32
     image: cobalt-build-win32
 
+  xb1:
+    <<: *common-definitions
+    environment:
+      <<: *shared-build-env
+      PLATFORM: xb1
+      COBALT_CONCURRENT_LINKS: ${COBALT_CONCURRENT_LINKS:-2}
+    image: cobalt-build-xb1
+    depends_on:
+      - build-xb1
+
   runner-win-win32:
     <<: *common-definitions
     build:
@@ -122,6 +143,19 @@ services:
       dockerfile: ./Dockerfile
       args:
         - RUNNER_VERSION=2.294.0
+        - FROM_IMAGE=cobalt-build-win-win32
     depends_on:
       - cobalt-build-win32-base
     image: cobalt-runner-win-win32
+
+  runner-xb1:
+    <<: *common-definitions
+    build:
+      context: ./docker/windows/runner
+      dockerfile: ./Dockerfile
+      args:
+        - RUNNER_VERSION=2.294.0
+        - FROM_IMAGE=cobalt-build-xb1
+    depends_on:
+      - xb1
+    image: cobalt-runner-xb1
diff --git a/docker/windows/runner/Dockerfile b/docker/windows/runner/Dockerfile
index a49481150bbde..b8aa4ad105076 100644
--- a/docker/windows/runner/Dockerfile
+++ b/docker/windows/runner/Dockerfile
@@ -11,7 +11,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-FROM cobalt-build-win32-base
+ARG FROM_IMAGE
+FROM ${FROM_IMAGE}
 
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop';$ProgressPreference='silentlyContinue';"]
 
@@ -20,7 +21,7 @@ ARG RUNNER_VERSION
 RUN Invoke-WebRequest -Uri 'https://aka.ms/install-powershell.ps1' -OutFile install-powershell.ps1; \
     powershell -ExecutionPolicy Unrestricted -File ./install-powershell.ps1 -AddToPath
 
-RUN Invoke-WebRequest -Uri https://github.com/actions/runner/releases/download/v$env:RUNNER_VERSION/actions-runner-win-x64-$env:RUNNER_VERSION.zip -OutFile runner.zip; \
+RUN Invoke-WebRequest -Uri https://github.com/actions/runner/releases/download/v$env:RUNNER_VERSION/actions-runner-win-x64-$env:RUNNER_VERSION.zip -OutFile C:/runner.zip; \
     Expand-Archive -Path C:/runner.zip -DestinationPath C:/actions-runner; \
     Remove-Item -Path C:\runner.zip; \
     setx /M PATH $(${Env:PATH} + \";${Env:ProgramFiles}\Git\bin\")
@@ -31,4 +32,4 @@ RUN choco install -f -y 7zip --version=19.0
 ENV TMP "C:\Users\ContainerAdministrator\AppData\Local\Temp2"
 
 ADD runner.ps1 C:/runner.ps1
-CMD ["pwsh", "-ExecutionPolicy", "Unrestricted", "-File", ".\\runner.ps1"]
+CMD ["pwsh", "-ExecutionPolicy", "Unrestricted", "-File", "C:\\runner.ps1"]
diff --git a/docker/windows/runner/runner.ps1 b/docker/windows/runner/runner.ps1
index 9e96a5e581740..fa4fb5c7922c2 100644
--- a/docker/windows/runner/runner.ps1
+++ b/docker/windows/runner/runner.ps1
@@ -1,2 +1,2 @@
-.\actions-runner\config.cmd --unattended --replace --url https://github.com/${env:RUNNER_REPO} --token $env:RUNNER_TOKEN --name $env:RUNNER_NAME --work $env:RUNNER_WORKDIR --labels $env:RUNNER_LABELS;
-.\actions-runner\run.cmd;
+C:\actions-runner\config.cmd --unattended --replace --url https://github.com/${env:RUNNER_REPO} --token $env:RUNNER_TOKEN --name $env:RUNNER_NAME --work $env:RUNNER_WORKDIR --labels $env:RUNNER_LABELS;
+C:\actions-runner\run.cmd;
diff --git a/docker/windows/xb1/Dockerfile b/docker/windows/xb1/Dockerfile
new file mode 100644
index 0000000000000..e4a7fd55c9ad3
--- /dev/null
+++ b/docker/windows/xb1/Dockerfile
@@ -0,0 +1,50 @@
+# escape=`
+
+# Copyright 2021 The Cobalt Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+ARG FROM_IMAGE
+FROM ${FROM_IMAGE}
+
+SHELL ["powershell", "-ExecutionPolicy", "Unrestricted", "-Command", `
+       "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
+
+# Note: Visual Studio is installed as part of cobalt-build-win-base
+
+# Windows SDK
+RUN Invoke-WebRequest -Uri https://go.microsoft.com/fwlink/p/?linkid=2173743 `
+    -OutFile C:\win_sdk_installer.exe ; `
+    Write-Host 'Installing win_sdk_installer.exe ...' ; `
+    C:\win_sdk_installer.exe /ceip off /quiet /features + | Out-Null ; `
+    Write-Host 'Install of win_sdk_installer.exe completed. Cleaning up ...' ; `
+    Remove-Item -Force -Recurse $env:TEMP\* ; `
+    Remove-Item C:\win_sdk_installer.exe
+
+# MSVC sdk
+ARG vs_buildtools_version="15"
+ARG windows_11_sdk_version="22000"
+RUN Write-Host 'Downloading vs_buildtools.exe' ; `
+    Invoke-WebRequest -Uri https://aka.ms/vs/${env:vs_buildtools_version}/release/vs_buildtools.exe `
+                      -OutFile C:\vs_buildtools.exe ; `
+    Write-Host 'Installing vs_buildtools.exe ...' ;`
+    Start-Process -Wait -FilePath C:\vs_buildtools.exe -ArgumentList "--quiet","--wait","--norestart","--nocache","--installPath","C:\BuildTools","--add","Microsoft.VisualStudio.Component.Windows11SDK.${env:windows_11_sdk_version}","--add","Microsoft.VisualStudio.Component.VC.Redist.14.Latest" ; `
+    Write-Host 'Install of vs_buildtools.exe completed. Cleaning up ...' ; `
+    Remove-Item C:\vs_buildtools.exe
+
+
+WORKDIR "C:\code"
+
+CMD python3 cobalt/build/gn.py -p $env:PLATFORM -c $env:CONFIG out/${env:PLATFORM}_${env:CONFIG};`
+    if ($?) {`
+      ninja $env:NINJA_FLAGS -C out/${env:PLATFORM}_$env:CONFIG $env:TARGET;`
+    }