diff --git a/changes/1691.feature.md b/changes/1691.feature.md
new file mode 100644
index 0000000000..eec0042c52
--- /dev/null
+++ b/changes/1691.feature.md
@@ -0,0 +1 @@
+Add the --output option to the function that outputs gql and openapi and unify the output format.
diff --git a/src/ai/backend/manager/cli/api.py b/src/ai/backend/manager/cli/api.py
index 1ce81df995..8d013b6a07 100644
--- a/src/ai/backend/manager/cli/api.py
+++ b/src/ai/backend/manager/cli/api.py
@@ -1,8 +1,11 @@
 from __future__ import annotations
 
+import asyncio
 import logging
+from pathlib import Path
 from typing import TYPE_CHECKING
 
+import aiofiles
 import click
 import graphene
 
@@ -19,9 +22,24 @@ def cli(args) -> None:
     pass
 
 
+async def generate_gql_schema(output_path: Path) -> None:
+    schema = graphene.Schema(query=Queries, mutation=Mutations, auto_camelcase=False)
+    if output_path == "-":
+        log.info("======== GraphQL API Schema ========")
+        print(str(schema))
+    else:
+        async with aiofiles.open(output_path, "w") as fw:
+            await fw.write(str(schema))
+
+
 @cli.command()
 @click.pass_obj
-def dump_gql_schema(cli_ctx: CLIContext) -> None:
-    schema = graphene.Schema(query=Queries, mutation=Mutations, auto_camelcase=False)
-    log.info("======== GraphQL API Schema ========")
-    print(str(schema))
+@click.option(
+    "--output",
+    "-o",
+    default="-",
+    type=click.Path(dir_okay=False, writable=True),
+    help="Output file path (default: stdout)",
+)
+def dump_gql_schema(cli_ctx: CLIContext, output: Path) -> None:
+    asyncio.run(generate_gql_schema(output))
diff --git a/src/ai/backend/manager/openapi.py b/src/ai/backend/manager/openapi.py
index bcb9f66bba..5d1e10c993 100644
--- a/src/ai/backend/manager/openapi.py
+++ b/src/ai/backend/manager/openapi.py
@@ -292,18 +292,26 @@ async def generate_openapi(output_path: Path) -> None:
             route_def["parameters"] = parameters
             route_def["description"] = "\n".join(description)
             openapi["paths"][path][method.lower()] = route_def
-
-    async with aiofiles.open(output_path, mode="w") as fw:
-        await fw.write(json.dumps(openapi, ensure_ascii=False, indent=2))
+    if output_path == "-" or output_path is None:
+        print(json.dumps(openapi, ensure_ascii=False, indent=2))
+    else:
+        async with aiofiles.open(output_path, mode="w") as fw:
+            await fw.write(json.dumps(openapi, ensure_ascii=False, indent=2))
 
 
 @click.command()
-@click.argument("OUTPUT_PATH")
-def main(output_path: Path) -> None:
+@click.option(
+    "--output",
+    "-o",
+    default="-",
+    type=click.Path(dir_okay=False, writable=True),
+    help="Output file path (default: stdout)",
+)
+def main(output: Path) -> None:
     """
     Generates OpenAPI specification of Backend.AI API.
     """
-    asyncio.run(generate_openapi(output_path))
+    asyncio.run(generate_openapi(output))
 
 
 if __name__ == "__main__":