diff --git a/benchmarks/core.bench.ts b/benchmarks/core.bench.ts
index eb9e2e0..c68a3c3 100644
--- a/benchmarks/core.bench.ts
+++ b/benchmarks/core.bench.ts
@@ -1,12 +1,57 @@
-import { bench, describe } from "vitest";
+/// <reference types="node" />
+
+import { mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import { arch } from "node:os";
+import { dirname, resolve } from "node:path";
+import { describe, test } from "vitest";
+import {
+  type BenchmarkBaseline,
+  buildBaseline,
+  compareToBaseline,
+  formatComparison,
+  formatTable,
+  recordBenchmark,
+} from "./report.js";
 import { coreWorkloads } from "./workloads.js";
 
-const options = { time: 750, warmupTime: 250 };
+// Vitest 5 moved timing from the per-`bench()` options to the run options; the
+// values mirror the pre-5.0 defaults so historical baselines stay comparable.
+const runOptions = { time: 750, warmupTime: 250 };
+
+// Vitest 5 dropped the `--outputJson`/`--compare` CLI flags; baseline and
+// comparison are selected through env vars set by the npm scripts.
+const baselineOut = process.env.BENCH_BASELINE_OUT;
+const baselineIn = process.env.BENCH_BASELINE_IN;
 
 describe("core workloads", () => {
-  for (const [name, workload] of Object.entries(coreWorkloads)) {
-    bench(name, () => {
-      workload();
-    }, options);
-  }
+  test("core", async ({ bench }) => {
+    const records = [];
+    for (const [name, workload] of Object.entries(coreWorkloads)) {
+      const result = await bench(name, () => {
+        workload();
+      }).run(runOptions);
+      records.push(recordBenchmark(name, result));
+    }
+
+    if (baselineIn) {
+      const baseline = JSON.parse(readFileSync(resolve(baselineIn), "utf8")) as BenchmarkBaseline;
+      process.stdout.write(`\n${formatComparison(compareToBaseline(records, baseline))}\n`);
+      return;
+    }
+
+    process.stdout.write(`\n${formatTable(records)}\n`);
+
+    if (baselineOut) {
+      const path = resolve(baselineOut);
+      mkdirSync(dirname(path), { recursive: true });
+      const baseline = buildBaseline(records, {
+        node: process.version,
+        arch: arch(),
+        platform: process.platform,
+        timezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
+      });
+      writeFileSync(path, `${JSON.stringify(baseline, null, 2)}\n`);
+      process.stdout.write(`\nbaseline written to ${baselineOut}\n`);
+    }
+  });
 });
diff --git a/benchmarks/report.ts b/benchmarks/report.ts
new file mode 100644
index 0000000..f4316a3
--- /dev/null
+++ b/benchmarks/report.ts
@@ -0,0 +1,139 @@
+/// <reference types="node" />
+
+// Vitest 5 removed the built-in benchmark table, `--outputJson`, and `--compare`.
+// `bench.compare()` now only runs the registrations and hands back their raw
+// statistics; formatting, baselines, and comparison are the caller's job. These
+// pure helpers keep that logic out of the `.bench.ts` file so it can be tested.
+
+// Minimal shape of the tinybench statistics we consume; kept local so the
+// helpers do not couple to vitest's evolving benchmark types.
+export interface BenchStatistics {
+  mean: number;
+  rme: number;
+}
+
+export interface BenchResultLike {
+  latency: BenchStatistics;
+  throughput: BenchStatistics;
+}
+
+export interface RecordedBenchmark {
+  name: string;
+  /** Mean wall-clock latency per operation, in milliseconds. */
+  latencyMeanMs: number;
+  /** Mean throughput, in operations per second. */
+  throughputMean: number;
+  /** Relative margin of error on latency, as a percentage. */
+  rme: number;
+}
+
+export interface BenchmarkBaseline {
+  schemaVersion: 1;
+  createdAt: string;
+  node: string;
+  arch: string;
+  platform: string;
+  timezone: string;
+  benchmarks: Record<string, RecordedBenchmark>;
+}
+
+export function recordBenchmark(name: string, result: BenchResultLike): RecordedBenchmark {
+  return {
+    name,
+    latencyMeanMs: result.latency.mean,
+    throughputMean: result.throughput.mean,
+    rme: result.latency.rme,
+  };
+}
+
+function padEnd(value: string, width: number): string {
+  return value.length >= width ? value : value + " ".repeat(width - value.length);
+}
+
+function padStart(value: string, width: number): string {
+  return value.length >= width ? value : " ".repeat(width - value.length) + value;
+}
+
+function formatNumber(value: number, fractionDigits: number): string {
+  if (!Number.isFinite(value)) return "n/a";
+  return value.toLocaleString("en-US", {
+    minimumFractionDigits: fractionDigits,
+    maximumFractionDigits: fractionDigits,
+  });
+}
+
+export function formatTable(records: RecordedBenchmark[]): string {
+  const header = ["name", "ops/sec", "mean ms", "±rme"];
+  const rows = records.map((record) => [
+    record.name,
+    formatNumber(record.throughputMean, 0),
+    formatNumber(record.latencyMeanMs, 4),
+    `±${formatNumber(record.rme, 2)}%`,
+  ]);
+  const widths = header.map((cell, column) =>
+    Math.max(cell.length, ...rows.map((row) => row[column]!.length)),
+  );
+  const render = (cells: string[]) =>
+    cells
+      .map((cell, column) => (column === 0 ? padEnd(cell, widths[column]!) : padStart(cell, widths[column]!)))
+      .join("  ");
+  return [render(header), render(widths.map((width) => "-".repeat(width))), ...rows.map(render)].join("\n");
+}
+
+export interface ComparisonRow {
+  name: string;
+  current: RecordedBenchmark;
+  baseline?: RecordedBenchmark;
+  /** Signed percentage change in throughput vs. baseline; positive is faster. */
+  throughputDeltaPct?: number;
+}
+
+export function compareToBaseline(
+  current: RecordedBenchmark[],
+  baseline: BenchmarkBaseline,
+): ComparisonRow[] {
+  return current.map((record) => {
+    const previous = baseline.benchmarks[record.name];
+    if (!previous || previous.throughputMean === 0) {
+      return { name: record.name, current: record, baseline: previous };
+    }
+    const throughputDeltaPct =
+      ((record.throughputMean - previous.throughputMean) / previous.throughputMean) * 100;
+    return { name: record.name, current: record, baseline: previous, throughputDeltaPct };
+  });
+}
+
+export function formatComparison(rows: ComparisonRow[]): string {
+  const header = ["name", "ops/sec", "baseline", "change"];
+  const body = rows.map((row) => [
+    row.name,
+    formatNumber(row.current.throughputMean, 0),
+    row.baseline ? formatNumber(row.baseline.throughputMean, 0) : "new",
+    row.throughputDeltaPct === undefined
+      ? "—"
+      : `${row.throughputDeltaPct >= 0 ? "+" : ""}${formatNumber(row.throughputDeltaPct, 2)}%`,
+  ]);
+  const widths = header.map((cell, column) =>
+    Math.max(cell.length, ...body.map((cells) => cells[column]!.length)),
+  );
+  const render = (cells: string[]) =>
+    cells
+      .map((cell, column) => (column === 0 ? padEnd(cell, widths[column]!) : padStart(cell, widths[column]!)))
+      .join("  ");
+  return [render(header), render(widths.map((width) => "-".repeat(width))), ...body.map(render)].join("\n");
+}
+
+export function buildBaseline(
+  records: RecordedBenchmark[],
+  meta: Pick<BenchmarkBaseline, "node" | "arch" | "platform" | "timezone"> & { createdAt?: string },
+): BenchmarkBaseline {
+  return {
+    schemaVersion: 1,
+    createdAt: meta.createdAt ?? new Date().toISOString(),
+    node: meta.node,
+    arch: meta.arch,
+    platform: meta.platform,
+    timezone: meta.timezone,
+    benchmarks: Object.fromEntries(records.map((record) => [record.name, record])),
+  };
+}
diff --git a/docs/TESTING.md b/docs/TESTING.md
index 35cc93f..bf1fd66 100644
--- a/docs/TESTING.md
+++ b/docs/TESTING.md
@@ -174,12 +174,13 @@ Keep the generalized property and add the minimized example to the nearest ordin
 ## Benchmarks and profiles
 
 ```bash
+npm run bench
 npm run bench:baseline
 npm run bench:compare
 npm run profile:core
 ```
 
-Compare benchmarks only on the same machine, Node version, architecture, timezone, and power state. Profiles are written to `.artifacts/profiles/`; load the `.cpuprofile` in a V8-compatible viewer. Shared benchmark workloads live in `benchmarks/workloads.ts`.
+`npm run bench` prints a table of throughput, mean latency, and margin of error. `bench:baseline` writes those results to `.artifacts/benchmarks/baseline.json`, and `bench:compare` reports the throughput change of a fresh run against that baseline. Compare benchmarks only on the same machine, Node version, architecture, timezone, and power state. Profiles are written to `.artifacts/profiles/`; load the `.cpuprofile` in a V8-compatible viewer. Shared benchmark workloads live in `benchmarks/workloads.ts`.
 
 ## Change-specific minimums
 
diff --git a/package-lock.json b/package-lock.json
index 2beeca6..aa2ae88 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,12 +13,12 @@
         "@earendil-works/pi-coding-agent": "0.85.1",
         "@earendil-works/pi-tui": "0.85.1",
         "@types/node": "^26.1.2",
-        "@vitest/coverage-v8": "^4.1.8",
+        "@vitest/coverage-v8": "^5.0.1",
         "fast-check": "^4.9.0",
         "tsx": "^4.23.1",
         "typebox": "1.3.30",
         "typescript": "^7.0.2",
-        "vitest": "^4.1.5"
+        "vitest": "^5.0.1"
       },
       "engines": {
         "node": ">=22.19.0"
@@ -50,13 +50,13 @@
       }
     },
     "node_modules/@babel/parser": {
-      "version": "7.29.7",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.29.7.tgz",
-      "integrity": "sha512-hnORnjP/1P/zFEndoeX+n+t1RwWRJiJpM/jO7FW32Kn9r5+sJB2JWOdYo4L6k78j15eCwY3Gm/7364B1EMwtNg==",
+      "version": "7.29.9",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.29.9.tgz",
+      "integrity": "sha512-CjXrNHTnvqBVqHgdBysY3vk2T8tpJHb5/RMeHJBTyVa9xgugCB0CJTx/3oO8RV2QRQP391RWpB7D6hLjm8V9uA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/types": "^7.29.7"
+        "@babel/types": "^7.29.8"
       },
       "bin": {
         "parser": "bin/babel-parser.js"
@@ -66,9 +66,9 @@
       }
     },
     "node_modules/@babel/types": {
-      "version": "7.29.7",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.29.7.tgz",
-      "integrity": "sha512-4zBIxpPzowiZpusoFkyGVwakdRJUyuH5PxQ/PrqghfdFWWasvnCdPfQXHrenDai+gyLARulZjZowCOj6fjT4pA==",
+      "version": "7.29.8",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.29.8.tgz",
+      "integrity": "sha512-Vj1jF3cPfxg7OAfoI7QnVKLoILlm2JF9pnVHrX8qx7AHMiYWT+NDAA7jChlNgRS4WTLc/fD1lXLmPixluj+3Gg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -3124,9 +3124,9 @@
       }
     },
     "node_modules/@jridgewell/sourcemap-codec": {
-      "version": "1.5.5",
-      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
-      "integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.6.0.tgz",
+      "integrity": "sha512-T7jf+5zgsZHwNJ4lvQ7/aezbyk0nNX+zJVWpmHA7VYsEx7a7qr5Rg5IbtJFqkgze5Y2sruq1RUY8Q837Od7iFw==",
       "dev": true,
       "license": "MIT"
     },
@@ -3142,19 +3142,20 @@
       }
     },
     "node_modules/@oxc-project/types": {
-      "version": "0.146.0",
-      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.146.0.tgz",
-      "integrity": "sha512-XC0QsnnhVe7sLIWmYmdPw7x5P0h4W8vUU3Nv1ySgWXtvCz8NizoAEpGXA0sOYoJQV2Rl13LgURAHQ5cI5ILCSA==",
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.150.0.tgz",
+      "integrity": "sha512-rDS5/31E9HfPl/CIzGrn0DOlvBbXFseQ5URJ9sYMfstbKLD/c6Gm9vmRzRGDdAXyOIL4zmO37lc9RIwYqVruZw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "funding": {
-        "url": "https://github.com/sponsors/Boshen"
+        "url": "https://github.com/sponsors/oxc-project"
       }
     },
     "node_modules/@rolldown/binding-android-arm-eabi": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm-eabi/-/binding-android-arm-eabi-1.2.5.tgz",
-      "integrity": "sha512-DLe/i+l8ynIBY7XEQ191TeZvCoowIGa18R+dIV30GW7DiOtp74i/xX8hs8GUjW5ARV7VZuie3d6AumSmCwbeRA==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm-eabi/-/binding-android-arm-eabi-1.2.9.tgz",
+      "integrity": "sha512-tNISae1QEf/vkb3xkRcjV5SEdzPE97We5IVaa2Z8jSszQPZ8U60B/YCYpw4QI7VidYsBtKavczXf+DyDs9WGxw==",
       "cpu": [
         "arm"
       ],
@@ -3164,14 +3165,15 @@
       "os": [
         "android"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/@rolldown/binding-android-arm64": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.2.5.tgz",
-      "integrity": "sha512-zXcwKlQApYAOELHd8PwKDFkagYF9Wy4e0RJ+0qnzl9Pjnpj75TEG8ufv40p2J7kCEfwZAsNiuzRIyNNMWT38ig==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.2.9.tgz",
+      "integrity": "sha512-YC8YsI30o606GTZi0VyzYlsDKFP8W61i/QzayHDkLbNEz/IShqAmTa+hsJRj13xTHA0H+6fk4b2UmGn+Q/cMlg==",
       "cpu": [
         "arm64"
       ],
@@ -3181,14 +3183,15 @@
       "os": [
         "android"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/@rolldown/binding-darwin-arm64": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.2.5.tgz",
-      "integrity": "sha512-dK4QakI42nzWgJT5sm4y4y/O//D4OxM75/cH28RLV+nzIN9AY+YsbuUVrUTjlLjXR6vpyxFbSsbmNuJ6BP9sww==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.2.9.tgz",
+      "integrity": "sha512-IwhlH3qK5urrY8hZiEgGkHKEFN901p/p2bjxCxJlr4GyNnF7wYpUvK+Y43uaRYuC4hpfjzbR3SJC3arX1jGvmw==",
       "cpu": [
         "arm64"
       ],
@@ -3198,14 +3201,15 @@
       "os": [
         "darwin"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/@rolldown/binding-darwin-x64": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.2.5.tgz",
-      "integrity": "sha512-fqSALaUu1Wjd1nK2uW2kJDWdLCc8lx1IcY+MTY26Aurfdx19anlzhqXOgCFbBFQnlFDTn4TC1/7Nz4Bl2mLP3A==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.2.9.tgz",
+      "integrity": "sha512-XxpJfVzFh+jilRxIXUqcfYAYcunIc/XEzIizsOL1fcJee5Sf7H3mH8WlLmfHfluz5amqR88QQo9izKtmMlavAw==",
       "cpu": [
         "x64"
       ],
@@ -3215,14 +3219,15 @@
       "os": [
         "darwin"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/@rolldown/binding-freebsd-x64": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.2.5.tgz",
-      "integrity": "sha512-/vCnNxlkxs9tKxNDcyWUePpJ/PgTzxIaVhoM5SmG8UV+GR/IcPam4VYxi7GIMo7PSDuNqlJqvprqii9NqqVCMw==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.2.9.tgz",
+      "integrity": "sha512-kSfvhmgeWyfkbT3p/1s5vSgboogoah2zkm9fX2zjg2hHxSV7T4KhMWRUUaRk4OXNqoD3QAUeRqLcs1aZOK4U1g==",
       "cpu": [
         "x64"
       ],
@@ -3232,14 +3237,15 @@
       "os": [
         "freebsd"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/@rolldown/binding-linux-arm-gnueabihf": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.2.5.tgz",
-      "integrity": "sha512-abk0NLA519LxRCszmbE0jYKuQ9YPocOXTiOXOo6Yr+YAT95VH+PtqYAjOJvGKt3viEd/x4qzabAlwd5bHOOARg==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.2.9.tgz",
+      "integrity": "sha512-1RVzG17pxqbTfYLC352JlLt6kKLG+6Hr30n8DlIJqsnV5luUDd2Qdx9Ayw1Cabfyb1K9k0jXEZ7evxkRoT+uiw==",
       "cpu": [
         "arm"
       ],
@@ -3249,14 +3255,15 @@
       "os": [
         "linux"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/@rolldown/binding-linux-arm64-gnu": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.2.5.tgz",
-      "integrity": "sha512-Y7eALiJ8lr0M2HH103Js+g7V34wf6snlpZLAsHI90uLhr3PVlNsbFVAXJC9d/V6BnPyKtpSwI+NcB/RLxsQxuA==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.2.9.tgz",
+      "integrity": "sha512-BXqPvZ2drqVD+/Z8UpKwcs4Mp7grM+eGFku4CAEKrEtcbAsUpzREphK1sogCRZGreVPiMkiiBtw0n3TPteuqvw==",
       "cpu": [
         "arm64"
       ],
@@ -3269,14 +3276,15 @@
       "os": [
         "linux"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/@rolldown/binding-linux-arm64-musl": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.2.5.tgz",
-      "integrity": "sha512-xMvZgnbZg4YVnR/AX2b3oOPDTFYJvUVaJg5FedA/LuvexAtXibZQej4cnTkw3rjsJ/ggUROB64TdtETiim+FYA==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.2.9.tgz",
+      "integrity": "sha512-11vWvo8YDwLzukt27J3aYDWU+gg2P7J+ZOmiJ0hkF5BXZDW7pVya7r40MXDy6ya0i9KamoENSVKIugvJNgFXIA==",
       "cpu": [
         "arm64"
       ],
@@ -3289,14 +3297,15 @@
       "os": [
         "linux"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
     "node_modules/@rolldown/binding-linux-ppc64-gnu": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.2.5.tgz",
-      "integrity": "sha512-GRjeqTUDHTo5GwntsLaAMcBahG3nlpjftXWZLN73HiYQlhwEowvarFgQnRnQZtIp4keXX7quXFbG38uPZBa2EA==",
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.2.9.tgz",
+      "integrity": "sha512-a1tijMkdwsIARtc0F39ApURROkf3NwqinI6TOiSSWCTR7dT96dffNvMUtDHnq64wKNTIZOIlzKrFvvFUznJiyw==",
       "cpu": [
         "ppc64"
       ],
@@ -3309,14 +3318,15 @@
       "os": [
         "linux"
       ],
+      "peer": true,
       "engines": {
         "node": "^20.19.0 || >=22.12.0"
       }
     },
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-        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "@types/chai": "^5.2.2",
+        "@vitest/mocker": "5.0.1",
+        "chai": "^6.2.2",
+        "es-module-lexer": "^2.3.2",
+        "expect-type": "^1.4.0",
+        "magic-string": "^1.2.3",
+        "obug": "^2.1.4",
+        "picomatch": "^4.0.7",
+        "std-env": "^4.2.0",
+        "tinybench": "6.1.4",
+        "tinyexec": "1.3.0",
+        "tinyglobby": "^0.2.17",
         "why-is-node-running": "^2.3.0"
       },
       "bin": {
         "vitest": "vitest.mjs"
       },
       "engines": {
-        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+        "node": "^22.12.0 || ^24.0.0 || >=26.0.0"
       },
       "funding": {
         "url": "https://opencollective.com/vitest"
@@ -4955,16 +4816,16 @@
       "peerDependencies": {
         "@edge-runtime/vm": "*",
         "@opentelemetry/api": "^1.9.0",
-        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
-        "@vitest/browser-playwright": "4.1.11",
-        "@vitest/browser-preview": "4.1.11",
-        "@vitest/browser-webdriverio": "4.1.11",
-        "@vitest/coverage-istanbul": "4.1.11",
-        "@vitest/coverage-v8": "4.1.11",
-        "@vitest/ui": "4.1.11",
+        "@types/node": "^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "5.0.1",
+        "@vitest/browser-preview": "5.0.1",
+        "@vitest/browser-webdriverio": "^5.0.0-beta.5 || >=5.0.0",
+        "@vitest/coverage-istanbul": "5.0.1",
+        "@vitest/coverage-v8": "5.0.1",
+        "@vitest/ui": "5.0.1",
         "happy-dom": "*",
         "jsdom": "*",
-        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+        "vite": "^6.4.0 || ^7.0.0 || ^8.0.0"
       },
       "peerDependenciesMeta": {
         "@edge-runtime/vm": {
diff --git a/package.json b/package.json
index 803f953..4658447 100644
--- a/package.json
+++ b/package.json
@@ -72,8 +72,8 @@
     "test:property": "TZ=UTC vitest run test/property --maxWorkers=1 --no-file-parallelism --passWithNoTests",
     "test:fuzz": "FC_NUM_RUNS=10000 npm run test:property",
     "bench": "TZ=UTC vitest bench --run --maxWorkers=1 --no-file-parallelism --passWithNoTests",
-    "bench:baseline": "node -e \"require('node:fs').mkdirSync('.artifacts/benchmarks',{recursive:true})\" && npm run bench -- --outputJson .artifacts/benchmarks/baseline.json",
-    "bench:compare": "npm run bench -- --compare .artifacts/benchmarks/baseline.json",
+    "bench:baseline": "BENCH_BASELINE_OUT=.artifacts/benchmarks/baseline.json npm run bench",
+    "bench:compare": "BENCH_BASELINE_IN=.artifacts/benchmarks/baseline.json npm run bench",
     "profile:core": "node -e \"const fs=require('node:fs');fs.mkdirSync('.artifacts/profiles',{recursive:true});fs.rmSync('.artifacts/profiles/core.cpuprofile',{force:true})\" && TZ=UTC node --import tsx --cpu-prof --cpu-prof-interval=1000 --cpu-prof-dir=.artifacts/profiles --cpu-prof-name=core.cpuprofile benchmarks/profile-core.ts",
     "hooks:install": "git config core.hooksPath .githooks",
     "typecheck": "npm run typecheck:prod && tsc -p tsconfig.dev.json",
@@ -86,12 +86,12 @@
     "@earendil-works/pi-coding-agent": "0.85.1",
     "@earendil-works/pi-tui": "0.85.1",
     "@types/node": "^26.1.2",
-    "@vitest/coverage-v8": "^4.1.8",
+    "@vitest/coverage-v8": "^5.0.1",
     "fast-check": "^4.9.0",
     "tsx": "^4.23.1",
     "typebox": "1.3.30",
     "typescript": "^7.0.2",
-    "vitest": "^4.1.5"
+    "vitest": "^5.0.1"
   },
   "pi": {
     "extensions": [
diff --git a/test/benchmark-report.test.ts b/test/benchmark-report.test.ts
new file mode 100644
index 0000000..ceed4c9
--- /dev/null
+++ b/test/benchmark-report.test.ts
@@ -0,0 +1,76 @@
+import { describe, expect, it } from "vitest";
+import {
+  type BenchResultLike,
+  buildBaseline,
+  compareToBaseline,
+  formatComparison,
+  formatTable,
+  recordBenchmark,
+} from "../benchmarks/report.js";
+
+function result(latencyMean: number, throughputMean: number, rme = 1.5): BenchResultLike {
+  return {
+    latency: { mean: latencyMean, rme },
+    throughput: { mean: throughputMean, rme },
+  };
+}
+
+describe("benchmark report helpers", () => {
+  it("records the fields we report from a raw benchmark result", () => {
+    const record = recordBenchmark("cron", result(0.5, 2000, 2.25));
+    expect(record).toEqual({
+      name: "cron",
+      latencyMeanMs: 0.5,
+      throughputMean: 2000,
+      rme: 2.25,
+    });
+  });
+
+  it("computes signed throughput deltas against a baseline", () => {
+    const baseline = buildBaseline([recordBenchmark("cron", result(1, 1000))], {
+      node: "v26.0.0",
+      arch: "arm64",
+      platform: "darwin",
+      timezone: "UTC",
+      createdAt: "2026-01-01T00:00:00.000Z",
+    });
+    const rows = compareToBaseline([recordBenchmark("cron", result(0.8, 1250))], baseline);
+    expect(rows[0]!.throughputDeltaPct).toBeCloseTo(25, 6);
+  });
+
+  it("marks a benchmark absent from the baseline as new without a delta", () => {
+    const baseline = buildBaseline([], {
+      node: "v26.0.0",
+      arch: "arm64",
+      platform: "darwin",
+      timezone: "UTC",
+    });
+    const rows = compareToBaseline([recordBenchmark("added", result(1, 1000))], baseline);
+    expect(rows[0]!.throughputDeltaPct).toBeUndefined();
+    expect(rows[0]!.baseline).toBeUndefined();
+    expect(formatComparison(rows)).toContain("new");
+  });
+
+  it("does not divide by a zero-throughput baseline", () => {
+    const baseline = buildBaseline([recordBenchmark("stalled", result(0, 0))], {
+      node: "v26.0.0",
+      arch: "arm64",
+      platform: "darwin",
+      timezone: "UTC",
+    });
+    const rows = compareToBaseline([recordBenchmark("stalled", result(1, 1000))], baseline);
+    expect(rows[0]!.throughputDeltaPct).toBeUndefined();
+  });
+
+  it("renders a table with a header and one row per benchmark", () => {
+    const table = formatTable([
+      recordBenchmark("cron", result(0.5, 2000)),
+      recordBenchmark("workflow", result(0.1, 10_000)),
+    ]);
+    const lines = table.split("\n");
+    expect(lines[0]).toContain("ops/sec");
+    expect(lines).toHaveLength(4); // header, divider, two rows
+    expect(table).toContain("cron");
+    expect(table).toContain("workflow");
+  });
+});