diff --git a/benchmarks/cli.py b/benchmarks/cli.py
index 2da7d51..2515f35 100644
--- a/benchmarks/cli.py
+++ b/benchmarks/cli.py
@@ -28,6 +28,7 @@ from benchmarks.logging.sources.sources import (
     FSOutputManager,
     split_logs_in_source,
     LogSource,
+    ChainedLogSource,
 )
 from benchmarks.logging.sources.vector_flat_file import VectorFlatFileSource
 
@@ -179,11 +180,18 @@ def _configure_logstash_source(args, structured_only=True):
 
 
 def _configure_vector_source(args):
-    if not args.source_file.exists():
-        print(f"Log source file {args.source_file} does not exist.")
-        sys.exit(-1)
-    return VectorFlatFileSource(
-        app_name="codex-benchmarks", file=args.source_file.open(encoding="utf-8")
+    for source_file in args.source_file:
+        if not source_file.exists():
+            print(f"Log source file {args.source_file} does not exist.")
+            sys.exit(-1)
+
+    return ChainedLogSource(
+        [
+            VectorFlatFileSource(
+                app_name="codex-benchmarks", file=source_file.open(encoding="utf-8")
+            )
+            for source_file in args.source_file
+        ]
     )
 
 
@@ -311,7 +319,7 @@ def main():
 
     vector_source = source_type.add_parser("vector", help="Vector flat file source.")
     vector_source.add_argument(
-        "source_file", type=Path, help="Vector log file to parse from."
+        "source_file", type=Path, help="Vector log file to parse from.", nargs="+"
     )
 
     vector_source.set_defaults(source=lambda args, _: _configure_vector_source(args))
diff --git a/benchmarks/codex/agent/tests/fake_codex.py b/benchmarks/codex/agent/tests/fake_codex.py
index 21ffeea..7ef4983 100644
--- a/benchmarks/codex/agent/tests/fake_codex.py
+++ b/benchmarks/codex/agent/tests/fake_codex.py
@@ -104,10 +104,12 @@ async def fake_codex_api() -> AsyncIterator[Tuple[FakeCodex, Url]]:
 
     runner = web.AppRunner(app)
     await runner.setup()
+
     site = web.TCPSite(runner, "localhost", 8888)
     await site.start()
 
     try:
         yield codex, Url(scheme="http", host="localhost", port=8888)
     finally:
+        await site.stop()
         await runner.cleanup()
diff --git a/benchmarks/logging/sources/sources.py b/benchmarks/logging/sources/sources.py
index 2b1ee1b..b13a1fd 100644
--- a/benchmarks/logging/sources/sources.py
+++ b/benchmarks/logging/sources/sources.py
@@ -57,6 +57,31 @@ class OutputManager(AbstractContextManager):
         pass
 
 
+class ChainedLogSource(LogSource):
+    """A :class:`LogSource` which chains multiple sources together."""
+
+    def __init__(self, sources: List[LogSource]) -> None:
+        self.sources = sources
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        pass
+
+    def experiments(self, group_id: str) -> Iterator[str]:
+        for source in self.sources:
+            with source:
+                yield from source.experiments(group_id)
+
+    def logs(
+        self, group_id: str, experiment_id: Optional[str] = None
+    ) -> Iterator[Tuple[ExperimentId, NodeId, RawLine]]:
+        for source in self.sources:
+            with source:
+                yield from source.logs(group_id, experiment_id)
+
+
 class FSOutputManager(OutputManager):
     """Simple :class:`OutputManager` which writes directly into the file system.