diff --git a/.github/workflows/run-benchmark.yml b/.github/workflows/run-benchmark.yml
index 0f29fab..0af96a2 100644
--- a/.github/workflows/run-benchmark.yml
+++ b/.github/workflows/run-benchmark.yml
@@ -32,7 +32,7 @@ on:
       max_parallel:
         description: Maximum concurrent task runners
         type: number
-        default: 12
+        default: 100
       fetch_use:
         description: Enable BrowserCode fetch service (requires Browser Use key)
         type: boolean
@@ -67,7 +67,7 @@ jobs:
         run: |
           python3 - <<'PY'
           import os
-          assert 1 <= int(os.environ["MAX_PARALLEL"]) <= 50
+          assert 1 <= int(os.environ["MAX_PARALLEL"]) <= 200
           assert 1 <= int(os.environ["TASK_TIMEOUT"]) <= 14400
           PY
           uv run python bcode_results.py prepare --tasks "$TASK_COUNT" --task-ids "$TASK_IDS"
diff --git a/README.md b/README.md
index c1efba4..1de0ae2 100644
--- a/README.md
+++ b/README.md
@@ -141,7 +141,7 @@ Defaults:
 | Executor | BrowserCode 0.1.20, `openai/gpt-6-luna`, xhigh reasoning |
 | Tasks | All 200 in `BU_Bench_V2.enc` |
 | Browser | Browser Use Cloud, one session per task |
-| Limits | 3 concurrent tasks; 3,600 seconds per task |
+| Limits | Up to 100 concurrent tasks; 3,600 seconds per task |
 | Judge | `gpt-5.6-luna`, xhigh reasoning |
 | Score | Continuous weighted V2 rubric score, including partial credit |
 
@@ -170,9 +170,10 @@ bu2-001/
 ```
 
 Use `--tasks 5` for a short run, or `--task-ids bu2-171 bu2-185` for exact cases.
-`--parallel` controls tasks per process; `--task-timeout` is in seconds. `--model`
-and `--agent-reasoning` select another BrowserCode model/variant, while
-`--judge-model` and `--judge-reasoning` change the findings judge. `--check`
+`--parallel` controls tasks per process (default 100); use a smaller value such as
+`--parallel 5` to fit your browser capacity or API limits. `--task-timeout` is in
+seconds. `--model` and `--agent-reasoning` select another BrowserCode model/variant,
+while `--judge-model` and `--judge-reasoning` change the findings judge. `--check`
 performs the binary/model preflight without executing tasks.
 
 The historical V1, Stealth, and framework comparison runners remain available
@@ -185,9 +186,11 @@ batch/orchestrator path.
 ### Running the default evaluation on GitHub Actions
 
 The manual **Run BU Bench V2** workflow runs one task per GitHub-hosted Ubuntu
-runner, with at most 12 task runners active. Every runner invokes the same
-`run_eval.py` command and judges its task. All 200 tasks run by default. The
-aggregate job requires every selected task exactly once and reports incomplete
+runner, with up to 100 task runners active by default, subject to your GitHub
+account's concurrency limits. Set `max_parallel` to override this (1–200).
+Every runner invokes the same `run_eval.py` command and judges its task.
+All 200 tasks run by default. The aggregate job requires every selected task
+exactly once and reports incomplete
 judging as an error instead of treating it as a zero or silently dropping it.
 
 For your own runs, fork the repository, enable Actions, and add your own secrets
diff --git a/run_eval.py b/run_eval.py
index 4811449..e584809 100644
--- a/run_eval.py
+++ b/run_eval.py
@@ -342,11 +342,13 @@ def parse_args(argv=None):
     parser.add_argument("--shard-count", type=int, help="Total contiguous shards")
     parser.add_argument("--task-timeout", type=int, default=None)
     parser.add_argument("--max-steps", type=int, default=None)
-    parser.add_argument("--concurrency", "--parallel", type=int, default=MAX_CONCURRENT)
+    parser.add_argument("--concurrency", "--parallel", type=int, default=None)
     args = parser.parse_args(argv)
     args.executor = args.executor or (
         "bcode" if args.benchmark == DEFAULT_BENCHMARK else "browser-use"
     )
+    if args.concurrency is None:
+        args.concurrency = 100 if args.executor == "bcode" else MAX_CONCURRENT
     if (args.shard_index is None) != (args.shard_count is None):
         parser.error("--shard-index and --shard-count must be provided together")
     if args.shard_count is not None and (
diff --git a/tests/test_bcode_runner.py b/tests/test_bcode_runner.py
index b8a480f..e0d7ad0 100644
--- a/tests/test_bcode_runner.py
+++ b/tests/test_bcode_runner.py
@@ -57,7 +57,7 @@ def test_defaults_select_all_200_and_only_bcode_findings_path(self):
         )
         self.assertEqual(
             (args.bcode_version, args.task_timeout, args.concurrency),
-            ("0.1.20", 3600, 3),
+            ("0.1.20", 3600, 100),
         )
         with contextlib.redirect_stderr(io.StringIO()), self.assertRaises(SystemExit):
             run_eval.parse_args(["--framework", "browser-use"])
@@ -98,6 +98,7 @@ def test_stealth_and_v1_keep_their_existing_executor_and_datasets(self):
                 ("browser-use", "bu-2-0", "local_headless"),
             )
             self.assertEqual(len(load_tasks(benchmark)), count)
+            self.assertEqual(args.concurrency, 3)
         explicit = run_eval.parse_args(["--executor", "browser-use"])
         self.assertEqual(explicit.benchmark, "BU_Bench_V2")
         self.assertEqual(explicit.model, "bu-2-0")