diff --git a/scripts/build_bun_binary.js b/scripts/build_bun_binary.js
new file mode 100644
index 0000000000..8be4f931a3
--- /dev/null
+++ b/scripts/build_bun_binary.js
@@ -0,0 +1,58 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { spawnSync } from 'node:child_process';
+import { existsSync } from 'node:fs';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const repoRoot = join(__dirname, '..');
+const bundleDir = join(repoRoot, 'bundle');
+const bundlePath = join(bundleDir, 'gemini.js');
+const outputPath = join(bundleDir, 'gemini-bun');
+
+if (!existsSync(bundlePath)) {
+  console.error(
+    'bundle/gemini.js is missing. Run `npm run bundle` before compiling with Bun.',
+  );
+  process.exit(1);
+}
+
+const bunBinary =
+  process.env.BUN_BIN || process.env.BUN_PATH || process.env.BUN || 'bun';
+
+console.log(`Using Bun binary: ${bunBinary}`);
+const result = spawnSync(
+  bunBinary,
+  [
+    'build',
+    '--compile',
+    bundlePath,
+    '--outfile',
+    outputPath,
+    '--embed=./bundle/sandbox-*.sb',
+  ],
+  {
+    cwd: repoRoot,
+    env: { ...process.env, NODE_ENV: 'production' },
+    stdio: 'inherit',
+  },
+);
+
+if (result.error?.code === 'ENOENT') {
+  console.error(
+    'Bun runtime not found in PATH. Install Bun (https://bun.sh) or set BUN_BIN to the Bun executable.',
+  );
+  process.exit(1);
+}
+
+if ((result.status ?? 1) !== 0) {
+  console.error('Bun compilation failed.');
+  process.exit(result.status ?? 1);
+}
+
+console.log(`Bun single binary created at ${outputPath}`);