From c27bdefc858c08ee575674b6e6a45d53f651957c Mon Sep 17 00:00:00 2001
From: James M Snell <jasnell@gmail.com>
Date: Tue, 8 Sep 2026 21:04:38 +0000
Subject: [PATCH] lib: put node:bench behind an --experimental-bench flag

Signed-off-by: James M Snell <jasnell@gmail.com>
Assisted-by: Opencode
---
 benchmark/_node-bench.js                      |   1 +
 doc/api/bench.md                              |  11 +-
 doc/api/cli.md                                |  18 ++-
 doc/node-config-schema.json                   | 107 ++++++++++++++++++
 doc/node.1                                    |  11 +-
 lib/internal/bench_runner/cli.js              |   9 +-
 lib/internal/bootstrap/realm.js               |   2 +
 lib/internal/process/pre_execution.js         |  11 ++
 src/node_builtins.cc                          |  20 ++--
 src/node_options.cc                           |  17 +++
 src/node_options.h                            |   2 +
 test/fixtures/bench-runner/node.config.json   |   3 +
 .../test-module-hooks-builtin-require.js      |   1 +
 .../test-module-hooks-load-builtin-require.js |   1 +
 test/parallel/test-bench-auto-run.js          |   3 +-
 test/parallel/test-bench-cli-arguments.js     |   4 +-
 test/parallel/test-bench-cli-backpressure.js  |   4 +-
 test/parallel/test-bench-cli-lifecycle.js     |   4 +-
 test/parallel/test-bench-cli-reporters.js     |   4 +-
 test/parallel/test-bench-cli.js               |  19 +++-
 test/parallel/test-bench-clock-precision.js   |   2 +-
 test/parallel/test-bench-context-control.js   |   2 +-
 test/parallel/test-bench-context-errors.js    |   2 +-
 test/parallel/test-bench-create-runner.js     |   2 +-
 test/parallel/test-bench-custom-reporter.js   |   2 +-
 .../test-bench-diagnostic-channels.js         |   2 +-
 test/parallel/test-bench-diagnostics.js       |   2 +-
 test/parallel/test-bench-errors.js            |   2 +-
 test/parallel/test-bench-filtering.js         |   2 +-
 test/parallel/test-bench-harness-errors.js    |   2 +-
 test/parallel/test-bench-hook-errors.js       |   2 +-
 test/parallel/test-bench-module.mjs           |   2 +-
 test/parallel/test-bench-reporters.js         |   2 +-
 test/parallel/test-bench-run-file.js          |   5 +-
 test/parallel/test-bench-run-options.js       |   2 +-
 test/parallel/test-bench-run.js               |   2 +-
 test/parallel/test-bench-stream.js            |   2 +-
 test/parallel/test-bench-validation.js        |   2 +-
 .../test-bench-yield-between-samples.js       |   2 +-
 .../test-module-builtin-experimental.js       |   2 +
 test/parallel/test-module-isBuiltin.js        |   6 +-
 41 files changed, 252 insertions(+), 49 deletions(-)

diff --git a/benchmark/_node-bench.js b/benchmark/_node-bench.js
index 6c8d1acffdfa..ecf383e3bc30 100644
--- a/benchmark/_node-bench.js
+++ b/benchmark/_node-bench.js
@@ -53,6 +53,7 @@ function runBenchmark(binary, file, options) {
   const args = [
     ...options.nodeArgs,
     '--no-warnings',
+    '--experimental-bench',
     '--bench',
     '--bench-reporter=json',
     '--bench-samples=1',
diff --git a/doc/api/bench.md b/doc/api/bench.md
index b25503830f2c..2f936caf2c72 100644
--- a/doc/api/bench.md
+++ b/doc/api/bench.md
@@ -12,7 +12,8 @@ added: REPLACEME
 
 The `node:bench` module supports defining and running JavaScript benchmarks in
 the current process, and running one benchmark file in a fresh child process.
-To access it:
+The module is only available when Node.js is started with the
+`--experimental-bench` flag and can only be imported with the `node:` scheme:
 
 ```mjs
 import { bench, suite } from 'node:bench';
@@ -22,8 +23,6 @@ import { bench, suite } from 'node:bench';
 const { bench, suite } = require('node:bench');
 ```
 
-This module is only available under the `node:` scheme.
-
 ## Example benchmark
 
 Save the following as `benchmark.mjs`:
@@ -57,7 +56,7 @@ suite('URL', () => {
 Run the benchmark from the command line:
 
 ```console
-node --bench benchmark.mjs
+node --experimental-bench --bench benchmark.mjs
 ```
 
 Benchmarks are executed serially in declaration order. Declared benchmarks are
@@ -183,8 +182,8 @@ declarations and a second call to `run()` is an error.
 The `--bench` flag runs one or more explicit benchmark files or glob patterns:
 
 ```console
-node --bench benchmark.mjs
-node --bench --bench-reporter=json 'benchmarks/**/*.js'
+node --experimental-bench --bench benchmark.mjs
+node --experimental-bench --bench --bench-reporter=json 'benchmarks/**/*.js'
 ```
 
 Files are sorted and executed serially. The default
diff --git a/doc/api/cli.md b/doc/api/cli.md
index 41f9d6534f81..3e3f2e4416f6 100644
--- a/doc/api/cli.md
+++ b/doc/api/cli.md
@@ -484,10 +484,13 @@ Starts the Node.js command-line benchmark runner. At least one explicit file or
 glob pattern is required:
 
 ```console
-node --bench benchmark.mjs
-node --bench 'benchmarks/**/*.js'
+node --experimental-bench --bench benchmark.mjs
+node --experimental-bench --bench 'benchmarks/**/*.js'
 ```
 
+The `--experimental-bench` flag is required to use this flag or any other
+`--bench-*` option.
+
 Quote glob patterns to prevent expansion by the shell. Matching files are
 sorted and executed serially. By default, each file runs in a separate child
 process. Benchmark files declare benchmarks using `node:bench`; they must not
@@ -1217,6 +1220,16 @@ changes:
 
 Enable experimental import support for `.node` addons.
 
+### `--experimental-bench`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental
+
+Enable the experimental `node:bench` module and command-line benchmark runner.
+
 ### `--experimental-config-file=path`, `--experimental-config-file`
 
 <!-- YAML
@@ -4076,6 +4089,7 @@ one is included in the list below.
 * `--entry-url`
 * `--experimental-abortcontroller`
 * `--experimental-addon-modules`
+* `--experimental-bench`
 * `--experimental-detect-module`
 * `--experimental-dtls`
 * `--experimental-eventsource`
diff --git a/doc/node-config-schema.json b/doc/node-config-schema.json
index 4618a5f17df1..07d4ac4a64ee 100644
--- a/doc/node-config-schema.json
+++ b/doc/node-config-schema.json
@@ -45,6 +45,63 @@
         "$schema": {
           "type": "string"
         },
+        "bench": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": [],
+          "properties": {
+            "bench": {
+              "type": "boolean",
+              "description": "launch benchmark runner on startup"
+            },
+            "bench-isolation": {
+              "type": "string",
+              "description": "configures the type of benchmark isolation used in the benchmark runner"
+            },
+            "bench-name-pattern": {
+              "type": "string",
+              "description": "run benchmarks whose name matches this regular expression"
+            },
+            "bench-reporter": {
+              "oneOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "minItems": 1,
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ],
+              "description": "report benchmark output using the given reporter"
+            },
+            "bench-reporter-destination": {
+              "oneOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "minItems": 1,
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ],
+              "description": "report the given benchmark reporter to the given destination"
+            },
+            "bench-samples": {
+              "type": "number",
+              "description": "specify the number of measured benchmark samples"
+            },
+            "bench-warmup": {
+              "type": "number",
+              "description": "specify the number of unreported benchmark warmup samples"
+            }
+          }
+        },
         "nodeOptions": {
           "additionalProperties": false,
           "required": [],
@@ -119,6 +176,52 @@
               "type": "boolean",
               "description": "Improve AsyncLocalStorage performance with AsyncContextFrame"
             },
+            "bench-isolation": {
+              "type": "string",
+              "description": "configures the type of benchmark isolation used in the benchmark runner"
+            },
+            "bench-name-pattern": {
+              "type": "string",
+              "description": "run benchmarks whose name matches this regular expression"
+            },
+            "bench-reporter": {
+              "oneOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "minItems": 1,
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ],
+              "description": "report benchmark output using the given reporter"
+            },
+            "bench-reporter-destination": {
+              "oneOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "minItems": 1,
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ],
+              "description": "report the given benchmark reporter to the given destination"
+            },
+            "bench-samples": {
+              "type": "number",
+              "description": "specify the number of measured benchmark samples"
+            },
+            "bench-warmup": {
+              "type": "number",
+              "description": "specify the number of unreported benchmark warmup samples"
+            },
             "conditions": {
               "oneOf": [
                 {
@@ -209,6 +312,10 @@
               "type": "boolean",
               "description": "experimental import support for addons"
             },
+            "experimental-bench": {
+              "type": "boolean",
+              "description": "experimental node:bench module and benchmark runner"
+            },
             "experimental-detect-module": {
               "type": "boolean",
               "description": "when ambiguous modules fail to evaluate because they contain ES module syntax, try again to evaluate them as ES modules"
diff --git a/doc/node.1 b/doc/node.1
index 5448bfd9b78e..894a69e150b7 100644
--- a/doc/node.1
+++ b/doc/node.1
@@ -296,9 +296,11 @@ Error: Access to this API has been restricted
 Starts the Node.js command-line benchmark runner. At least one explicit file or
 glob pattern is required:
 .Bd -literal
-node --bench benchmark.mjs
-node --bench 'benchmarks/**/*.js'
+node --experimental-bench --bench benchmark.mjs
+node --experimental-bench --bench 'benchmarks/**/*.js'
 .Ed
+The \fB--experimental-bench\fR flag is required to use this flag or any other
+\fB--bench-*\fR option.
 Quote glob patterns to prevent expansion by the shell. Matching files are
 sorted and executed serially. By default, each file runs in a separate child
 process. Benchmark files declare benchmarks using \fBnode:bench\fR; they must not
@@ -677,6 +679,9 @@ It is possible to run code containing inline types unless the
 .It Fl -experimental-addon-modules
 Enable experimental import support for \fB.node\fR addons.
 .
+.It Fl -experimental-bench
+Enable the experimental \fBnode:bench\fR module and command-line benchmark runner.
+.
 .It Fl -experimental-config-file Ns = Ns Ar path , Fl -experimental-config-file
 If present, Node.js will look for a configuration file at the specified path.
 If the path is not specified, Node.js will look for a \fBnode.config.json\fR file
@@ -2092,6 +2097,8 @@ one is included in the list below.
 .It
 \fB--experimental-addon-modules\fR
 .It
+\fB--experimental-bench\fR
+.It
 \fB--experimental-detect-module\fR
 .It
 \fB--experimental-dtls\fR
diff --git a/lib/internal/bench_runner/cli.js b/lib/internal/bench_runner/cli.js
index 5eaf0a317147..96930ca56878 100644
--- a/lib/internal/bench_runner/cli.js
+++ b/lib/internal/bench_runner/cli.js
@@ -106,7 +106,11 @@ const kEventTypes = new SafeSet([
   'bench:diagnostic',
   'bench:summary',
 ]);
-const kFilterArgs = ['--bench', '--experimental-default-config-file'];
+const kFilterArgs = [
+  '--bench',
+  '--experimental-bench',
+  '--experimental-default-config-file',
+];
 const kFilterArgValues = [
   '--bench-isolation',
   '--bench-name-pattern',
@@ -741,7 +745,8 @@ function getInheritedChildArgs() {
 function getChildArgs(path, options) {
   const args = options.execArgv === undefined ?
     getInheritedChildArgs() : ArrayPrototypeSlice(options.execArgv);
-  ArrayPrototypePush(args, '--bench', '--bench-isolation=none');
+  ArrayPrototypePush(
+    args, '--experimental-bench', '--bench', '--bench-isolation=none');
   if (options.namePatternSource.length > 0) {
     ArrayPrototypePush(
       args, `--bench-name-pattern=${options.namePatternSource}`);
diff --git a/lib/internal/bootstrap/realm.js b/lib/internal/bootstrap/realm.js
index 81ac2a0e398e..92314a873d3e 100644
--- a/lib/internal/bootstrap/realm.js
+++ b/lib/internal/bootstrap/realm.js
@@ -137,6 +137,8 @@ const schemelessBlockList = new SafeSet([
 ]);
 // Modules that will only be enabled at run time.
 const experimentalModuleList = new SafeSet([
+  'bench',
+  'bench/reporters',
   'dtls',
   'ffi',
   'quic',
diff --git a/lib/internal/process/pre_execution.js b/lib/internal/process/pre_execution.js
index 817b76cfc74b..928c2589e07c 100644
--- a/lib/internal/process/pre_execution.js
+++ b/lib/internal/process/pre_execution.js
@@ -114,6 +114,7 @@ function prepareExecution(options) {
   setupNetworkInspection();
   setupNavigator();
   setupWarningHandler();
+  setupBench();
   setupFFI();
   setupSQLite();
   setupStreamIter();
@@ -382,6 +383,16 @@ function setupNavigator() {
   defineReplaceableLazyAttribute(globalThis, 'internal/navigator', ['navigator'], false);
 }
 
+function setupBench() {
+  if (!getOptionValue('--experimental-bench')) {
+    return;
+  }
+
+  const { BuiltinModule } = require('internal/bootstrap/realm');
+  BuiltinModule.allowRequireByUsers('bench');
+  BuiltinModule.allowRequireByUsers('bench/reporters');
+}
+
 function setupFFI() {
   if (!getOptionValue('--experimental-ffi')) {
     return;
diff --git a/src/node_builtins.cc b/src/node_builtins.cc
index 2cefc8d74e1a..21af988c95d8 100644
--- a/src/node_builtins.cc
+++ b/src/node_builtins.cc
@@ -158,15 +158,17 @@ BuiltinLoader::BuiltinCategories BuiltinLoader::GetBuiltinCategories() const {
 #if !HAVE_FFI
         "internal/ffi-shared-buffer", "internal/ffi/fast-api",
 #endif                  // !HAVE_FFI
-        "dtls",         // Experimental.
-        "ffi",          // Experimental.
-        "quic",         // Experimental.
-        "sqlite",       // Experimental.
-        "stream/iter",  // Experimental.
-        "sys",          // Deprecated.
-        "vfs",          // Experimental.
-        "wasi",         // Experimental.
-        "zlib/iter",    // Experimental.
+        "bench",        // Experimental.
+        "bench/reporters",  // Experimental.
+        "dtls",             // Experimental.
+        "ffi",              // Experimental.
+        "quic",             // Experimental.
+        "sqlite",           // Experimental.
+        "stream/iter",      // Experimental.
+        "sys",              // Deprecated.
+        "vfs",              // Experimental.
+        "wasi",             // Experimental.
+        "zlib/iter",        // Experimental.
 #if !HAVE_SQLITE
         "internal/webstorage",  // Experimental.
         "internal/inspector/webstorage",
diff --git a/src/node_options.cc b/src/node_options.cc
index 9077325e393d..ee784db13037 100644
--- a/src/node_options.cc
+++ b/src/node_options.cc
@@ -243,6 +243,11 @@ void EnvironmentOptions::CheckOptions(std::vector<std::string>* errors,
     errors->push_back("invalid value for --trace-require-module");
   }
 
+  if (has_bench_options && !experimental_bench) {
+    errors->push_back(
+        "--experimental-bench is required to use --bench or related options");
+  }
+
   if (bench_runner && test_runner) {
     errors->push_back("either --bench or --test can be used, not both");
   }
@@ -632,6 +637,10 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             "experimental import support for addons",
             BOOL_FIELD(experimental_addon_modules),
             kAllowedInEnvvar);
+  AddOption("--experimental-bench",
+            "experimental node:bench module and benchmark runner",
+            BOOL_FIELD(experimental_bench),
+            kAllowedInEnvvar);
   AddOption("--experimental-abortcontroller", "", NoOp{}, kAllowedInEnvvar);
   AddOption("--experimental-eventsource",
             "experimental EventSource API",
@@ -985,33 +994,39 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             "use the specified file for package map resolution",
             &EnvironmentOptions::experimental_package_map_path,
             kAllowedInEnvvar);
+  AddOption("[has_bench_options]", "", BOOL_FIELD(has_bench_options));
   AddOption("--bench",
             "launch benchmark runner on startup",
             BOOL_FIELD(bench_runner),
             kDisallowedInEnvvar,
             false,
             OptionNamespaces::kBenchRunnerNamespace);
+  Implies("--bench", "[has_bench_options]");
   AddOption("--bench-isolation",
             "configures the type of benchmark isolation used in the benchmark "
             "runner",
             &EnvironmentOptions::bench_isolation,
             kAllowedInEnvvar,
             OptionNamespaces::kBenchRunnerNamespace);
+  Implies("--bench-isolation", "[has_bench_options]");
   AddOption("--bench-name-pattern",
             "run benchmarks whose name matches this regular expression",
             &EnvironmentOptions::bench_name_pattern,
             kAllowedInEnvvar,
             OptionNamespaces::kBenchRunnerNamespace);
+  Implies("--bench-name-pattern", "[has_bench_options]");
   AddOption("--bench-reporter",
             "report benchmark output using the given reporter",
             &EnvironmentOptions::bench_reporter,
             kAllowedInEnvvar,
             OptionNamespaces::kBenchRunnerNamespace);
+  Implies("--bench-reporter", "[has_bench_options]");
   AddOption("--bench-reporter-destination",
             "report the given benchmark reporter to the given destination",
             &EnvironmentOptions::bench_reporter_destination,
             kAllowedInEnvvar,
             OptionNamespaces::kBenchRunnerNamespace);
+  Implies("--bench-reporter-destination", "[has_bench_options]");
   AddOption("[has_bench_samples]", "", BOOL_FIELD(has_bench_samples));
   AddOption("--bench-samples",
             "specify the number of measured benchmark samples",
@@ -1019,6 +1034,7 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             kAllowedInEnvvar,
             OptionNamespaces::kBenchRunnerNamespace,
             kStrictOptionParsing);
+  Implies("--bench-samples", "[has_bench_options]");
   Implies("--bench-samples", "[has_bench_samples]");
   AddOption("[has_bench_warmup]", "", BOOL_FIELD(has_bench_warmup));
   AddOption("--bench-warmup",
@@ -1027,6 +1043,7 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             kAllowedInEnvvar,
             OptionNamespaces::kBenchRunnerNamespace,
             kStrictOptionParsing);
+  Implies("--bench-warmup", "[has_bench_options]");
   Implies("--bench-warmup", "[has_bench_warmup]");
   AddOption("--test",
             "launch test runner on startup",
diff --git a/src/node_options.h b/src/node_options.h
index ffd76d70526c..d40ac78cc233 100644
--- a/src/node_options.h
+++ b/src/node_options.h
@@ -206,6 +206,7 @@ class EnvironmentOptions : public Options {
   DEFINE_BOOL_FIELD(require_module) = true;
   DEFINE_BOOL_FIELD(enable_source_maps) = false;
   DEFINE_BOOL_FIELD(experimental_addon_modules) = true;
+  DEFINE_BOOL_FIELD(experimental_bench) = EXPERIMENTALS_DEFAULT_VALUE;
   DEFINE_BOOL_FIELD(experimental_eventsource) = EXPERIMENTALS_DEFAULT_VALUE;
   DEFINE_BOOL_FIELD(experimental_ffi) = HAVE_FFI;
   DEFINE_BOOL_FIELD(experimental_web_worker) = EXPERIMENTALS_DEFAULT_VALUE;
@@ -251,6 +252,7 @@ class EnvironmentOptions : public Options {
   DEFINE_BOOL_FIELD(prof_process) = false;
   DEFINE_BOOL_FIELD(has_env_file_string) = false;
   DEFINE_BOOL_FIELD(bench_runner) = false;
+  DEFINE_BOOL_FIELD(has_bench_options) = false;
   DEFINE_BOOL_FIELD(has_bench_samples) = false;
   DEFINE_BOOL_FIELD(has_bench_warmup) = false;
   DEFINE_BOOL_FIELD(test_runner) = false;
diff --git a/test/fixtures/bench-runner/node.config.json b/test/fixtures/bench-runner/node.config.json
index 0344e2a4b7f4..43ca70e1a6fa 100644
--- a/test/fixtures/bench-runner/node.config.json
+++ b/test/fixtures/bench-runner/node.config.json
@@ -1,4 +1,7 @@
 {
+  "nodeOptions": {
+    "experimental-bench": true
+  },
   "bench": {
     "bench-isolation": "none",
     "bench-reporter": ["json"],
diff --git a/test/module-hooks/test-module-hooks-builtin-require.js b/test/module-hooks/test-module-hooks-builtin-require.js
index e1e137ce1169..0ee8de756116 100644
--- a/test/module-hooks/test-module-hooks-builtin-require.js
+++ b/test/module-hooks/test-module-hooks-builtin-require.js
@@ -1,3 +1,4 @@
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 // This tests that when builtins that demand the `node:` prefix are
diff --git a/test/module-hooks/test-module-hooks-load-builtin-require.js b/test/module-hooks/test-module-hooks-load-builtin-require.js
index 946fc1e48766..d86eb4b9df76 100644
--- a/test/module-hooks/test-module-hooks-load-builtin-require.js
+++ b/test/module-hooks/test-module-hooks-load-builtin-require.js
@@ -1,3 +1,4 @@
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-auto-run.js b/test/parallel/test-bench-auto-run.js
index 6baf7b327cdc..82e91f97b4a4 100644
--- a/test/parallel/test-bench-auto-run.js
+++ b/test/parallel/test-bench-auto-run.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
@@ -8,6 +8,7 @@ const { bench } = require('node:bench');
 
 const child = spawnSync(process.execPath, [
   '--no-warnings',
+  '--experimental-bench',
   '-e',
   'require("node:bench").bench("failure", () => { throw new Error(); })',
 ]);
diff --git a/test/parallel/test-bench-cli-arguments.js b/test/parallel/test-bench-cli-arguments.js
index 81093284e312..f8757300a843 100644
--- a/test/parallel/test-bench-cli-arguments.js
+++ b/test/parallel/test-bench-cli-arguments.js
@@ -19,7 +19,9 @@ function spawnNode(args, options = undefined) {
 }
 
 function spawnBench(args, options = undefined) {
-  return spawnNode(['--no-warnings', '--bench', ...args], options);
+  return spawnNode([
+    '--no-warnings', '--experimental-bench', '--bench', ...args,
+  ], options);
 }
 
 for (const { args, message } of [
diff --git a/test/parallel/test-bench-cli-backpressure.js b/test/parallel/test-bench-cli-backpressure.js
index 0c885ccaeaec..47e4fdff252d 100644
--- a/test/parallel/test-bench-cli-backpressure.js
+++ b/test/parallel/test-bench-cli-backpressure.js
@@ -20,7 +20,9 @@ function spawnNode(args, options = undefined) {
 }
 
 function spawnBench(args, options = undefined) {
-  return spawnNode(['--no-warnings', '--bench', ...args], options);
+  return spawnNode([
+    '--no-warnings', '--experimental-bench', '--bench', ...args,
+  ], options);
 }
 
 function parseRecords(result) {
diff --git a/test/parallel/test-bench-cli-lifecycle.js b/test/parallel/test-bench-cli-lifecycle.js
index 64130e1467bf..ab42857f2789 100644
--- a/test/parallel/test-bench-cli-lifecycle.js
+++ b/test/parallel/test-bench-cli-lifecycle.js
@@ -20,7 +20,9 @@ function spawnNode(args, options = undefined) {
 }
 
 function spawnBench(args, options = undefined) {
-  return spawnNode(['--no-warnings', '--bench', ...args], options);
+  return spawnNode([
+    '--no-warnings', '--experimental-bench', '--bench', ...args,
+  ], options);
 }
 
 function parseRecords(result) {
diff --git a/test/parallel/test-bench-cli-reporters.js b/test/parallel/test-bench-cli-reporters.js
index 204e0d446b14..31cee67aaa12 100644
--- a/test/parallel/test-bench-cli-reporters.js
+++ b/test/parallel/test-bench-cli-reporters.js
@@ -24,7 +24,9 @@ function spawnNode(args, options = undefined) {
 }
 
 function spawnBench(args, options = undefined) {
-  return spawnNode(['--no-warnings', '--bench', ...args], options);
+  return spawnNode([
+    '--no-warnings', '--experimental-bench', '--bench', ...args,
+  ], options);
 }
 
 function parseRecords(result) {
diff --git a/test/parallel/test-bench-cli.js b/test/parallel/test-bench-cli.js
index e52530754000..059f7ea562a7 100644
--- a/test/parallel/test-bench-cli.js
+++ b/test/parallel/test-bench-cli.js
@@ -25,7 +25,9 @@ function spawnNode(args, options = undefined) {
 }
 
 function spawnBench(args, options = undefined) {
-  return spawnNode(['--no-warnings', '--bench', ...args], options);
+  return spawnNode([
+    '--no-warnings', '--experimental-bench', '--bench', ...args,
+  ], options);
 }
 
 function parseRecords(result) {
@@ -37,6 +39,20 @@ function parseOutput(output) {
   return output.trim().split('\n').map((line) => JSON.parse(line));
 }
 
+for (const option of [
+  '--bench',
+  '--bench-isolation=process',
+  '--bench-name-pattern=benchmark',
+  '--bench-reporter=spec',
+  '--bench-reporter-destination=stdout',
+  '--bench-samples=1',
+  '--bench-warmup=0',
+]) {
+  const result = spawnNode([option]);
+  assert.notStrictEqual(result.status, 0);
+  assert.match(result.stderr, /--experimental-bench is required/);
+}
+
 {
   const result = spawnBench([]);
   assert.strictEqual(result.status, 1);
@@ -75,6 +91,7 @@ for (const { patterns, message } of [
 ]) {
   const result = spawnNode([
     '--no-warnings',
+    '--experimental-bench',
     '--require', fixtures.path('bench-runner/fake-ipc.cjs'),
     '--bench',
     ...patterns,
diff --git a/test/parallel/test-bench-clock-precision.js b/test/parallel/test-bench-clock-precision.js
index 93158e51319b..7f7fc8009694 100644
--- a/test/parallel/test-bench-clock-precision.js
+++ b/test/parallel/test-bench-clock-precision.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-context-control.js b/test/parallel/test-bench-context-control.js
index 6ee095f94eae..d8be59a4e5e2 100644
--- a/test/parallel/test-bench-context-control.js
+++ b/test/parallel/test-bench-context-control.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-context-errors.js b/test/parallel/test-bench-context-errors.js
index 995330c5faef..4fd81ee2c821 100644
--- a/test/parallel/test-bench-context-errors.js
+++ b/test/parallel/test-bench-context-errors.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-create-runner.js b/test/parallel/test-bench-create-runner.js
index 51474af3d99c..d12bc5db4b6e 100644
--- a/test/parallel/test-bench-create-runner.js
+++ b/test/parallel/test-bench-create-runner.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-custom-reporter.js b/test/parallel/test-bench-custom-reporter.js
index 1d4ec8bed191..9c67dfa56ff1 100644
--- a/test/parallel/test-bench-custom-reporter.js
+++ b/test/parallel/test-bench-custom-reporter.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-diagnostic-channels.js b/test/parallel/test-bench-diagnostic-channels.js
index 9e1bb2a07024..1c6d3f60135b 100644
--- a/test/parallel/test-bench-diagnostic-channels.js
+++ b/test/parallel/test-bench-diagnostic-channels.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-diagnostics.js b/test/parallel/test-bench-diagnostics.js
index 9e33fd56323f..b5383f2bdacc 100644
--- a/test/parallel/test-bench-diagnostics.js
+++ b/test/parallel/test-bench-diagnostics.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-errors.js b/test/parallel/test-bench-errors.js
index e540d5d847c5..c6e4a022cfdd 100644
--- a/test/parallel/test-bench-errors.js
+++ b/test/parallel/test-bench-errors.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-filtering.js b/test/parallel/test-bench-filtering.js
index da580dcdafc0..b9a3124d8b7e 100644
--- a/test/parallel/test-bench-filtering.js
+++ b/test/parallel/test-bench-filtering.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-harness-errors.js b/test/parallel/test-bench-harness-errors.js
index 4fd6ec739488..a8ea3bb779ad 100644
--- a/test/parallel/test-bench-harness-errors.js
+++ b/test/parallel/test-bench-harness-errors.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-hook-errors.js b/test/parallel/test-bench-hook-errors.js
index f2977f241deb..498406010c49 100644
--- a/test/parallel/test-bench-hook-errors.js
+++ b/test/parallel/test-bench-hook-errors.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-module.mjs b/test/parallel/test-bench-module.mjs
index 3efe9a1f6151..b3b17976e19f 100644
--- a/test/parallel/test-bench-module.mjs
+++ b/test/parallel/test-bench-module.mjs
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 
 import '../common/index.mjs';
 import assert from 'node:assert';
diff --git a/test/parallel/test-bench-reporters.js b/test/parallel/test-bench-reporters.js
index f383e2cf5213..7a3ed8bff7cc 100644
--- a/test/parallel/test-bench-reporters.js
+++ b/test/parallel/test-bench-reporters.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-run-file.js b/test/parallel/test-bench-run-file.js
index ec0265ab162c..14735986dc7c 100644
--- a/test/parallel/test-bench-run-file.js
+++ b/test/parallel/test-bench-run-file.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
@@ -315,6 +315,7 @@ function testEvalParent() {
   `;
   const result = spawnSync(process.execPath, [
     '--no-warnings',
+    '--experimental-bench',
     '-e',
     script,
   ], { encoding: 'utf8' });
@@ -350,6 +351,7 @@ function testPermissions() {
   `;
   const result = spawnSync(process.execPath, [
     '--no-warnings',
+    '--experimental-bench',
     '--permission',
     '--allow-child-process',
     '-e',
@@ -378,6 +380,7 @@ function testPermissions() {
   `;
   const childProcessResult = spawnSync(process.execPath, [
     '--no-warnings',
+    '--experimental-bench',
     '--permission',
     `--allow-fs-read=${fixture}`,
     '-e',
diff --git a/test/parallel/test-bench-run-options.js b/test/parallel/test-bench-run-options.js
index bbb89f5fdc99..e68b4e29c102 100644
--- a/test/parallel/test-bench-run-options.js
+++ b/test/parallel/test-bench-run-options.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-run.js b/test/parallel/test-bench-run.js
index e79411f83e1d..0107150262d7 100644
--- a/test/parallel/test-bench-run.js
+++ b/test/parallel/test-bench-run.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-stream.js b/test/parallel/test-bench-stream.js
index 115364c7db5e..8fe0870ae55a 100644
--- a/test/parallel/test-bench-stream.js
+++ b/test/parallel/test-bench-stream.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-validation.js b/test/parallel/test-bench-validation.js
index 39edc5d411cc..2b508f18666f 100644
--- a/test/parallel/test-bench-validation.js
+++ b/test/parallel/test-bench-validation.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-bench-yield-between-samples.js b/test/parallel/test-bench-yield-between-samples.js
index aceb381d1a57..92b51e9409a5 100644
--- a/test/parallel/test-bench-yield-between-samples.js
+++ b/test/parallel/test-bench-yield-between-samples.js
@@ -1,4 +1,4 @@
-// Flags: --no-warnings
+// Flags: --experimental-bench --no-warnings
 'use strict';
 
 const common = require('../common');
diff --git a/test/parallel/test-module-builtin-experimental.js b/test/parallel/test-module-builtin-experimental.js
index 1257a96e8208..282701e7a0ae 100644
--- a/test/parallel/test-module-builtin-experimental.js
+++ b/test/parallel/test-module-builtin-experimental.js
@@ -4,6 +4,8 @@ const common = require('../common');
 const { spawnSyncAndAssert } = require('../common/child_process');
 
 const experimentalBuiltins = [
+  ['bench', '--experimental-bench', true],
+  ['bench/reporters', '--experimental-bench', true],
   ['dtls', '--experimental-dtls', common.hasDtls],
   ['quic', '--experimental-quic', common.hasQuic],
   ['vfs', '--experimental-vfs', true],
diff --git a/test/parallel/test-module-isBuiltin.js b/test/parallel/test-module-isBuiltin.js
index ccf359c32029..58290e935ca2 100644
--- a/test/parallel/test-module-isBuiltin.js
+++ b/test/parallel/test-module-isBuiltin.js
@@ -7,12 +7,12 @@ const { isBuiltin } = require('module');
 assert(isBuiltin('http'));
 assert(isBuiltin('sys'));
 assert(isBuiltin('node:fs'));
-assert(isBuiltin('node:bench'));
-assert(isBuiltin('node:bench/reporters'));
 assert(isBuiltin('node:test'));
 
-// Does not include internal modules
+// Does not include internal or disabled experimental modules
 assert(!isBuiltin('internal/errors'));
+assert(!isBuiltin('node:bench'));
+assert(!isBuiltin('node:bench/reporters'));
 assert(!isBuiltin('bench'));
 assert(!isBuiltin('bench/reporters'));
 assert(!isBuiltin('test'));