diff --git a/index/index.html b/index/index.html
index 24092bd..769d056 100644
--- a/index/index.html
+++ b/index/index.html
@@ -334,8 +334,8 @@ <h2>Matrix multiply cost grows with the <span class="grad">cube</span> of size.<
         <p style="margin-top:12px">Trivial today — the N³ term means this is not where the real cost lives.</p>
       </div>
       <div class="card scale-card reveal" style="transition-delay:.06s">
-        <div class="kpi">3.5 TFLOP</div>
-        <div class="sub">N = 12,000 — CCO's reference regime</div>
+        <div class="kpi">1.1 TFLOP</div>
+        <div class="sub">N = 8,192 — CCO's reference regime</div>
         <p style="margin-top:12px">Full-rank data, deliberately the hard case — no structure to exploit for free.</p>
       </div>
       <div class="card scale-card reveal" style="transition-delay:.12s">
@@ -461,7 +461,7 @@ <h2>From matmul, live today, to sub-quadratic attention.</h2>
         <div class="tl-body">
           <h3>Matmul arena</h3>
           <p>Approximate and exact-but-cheaper strategies for C = A × B, scored on full-rank, low-rank, and decaying-spectrum regimes. Open for contributions today.</p>
-          <div class="tl-tags"><span class="tag">subspace</span><span class="tag">N=12000</span><span class="tag">open now</span></div>
+          <div class="tl-tags"><span class="tag">subspace</span><span class="tag">N=8192</span><span class="tag">open now</span></div>
         </div>
       </div>
       <div class="tl-row reveal">
@@ -524,7 +524,7 @@ <h3>Run the scorer</h3>
         <p style="margin-bottom:18px">Clone the repo, install PyTorch, and reproduce the matmul reference scorecard on your own GPU — the same numbers a reviewer checks.</p>
         <ul class="feature-list">
           <li><span class="check"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3"><path d="M20 6L9 17l-5-5"/></svg></span><span>CUDA or Apple MPS, PyTorch-only</span></li>
-          <li><span class="check"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3"><path d="M20 6L9 17l-5-5"/></svg></span><span><code style="font-family:var(--mono)">python -m eval --n 12000 --pairs 3</code></span></li>
+          <li><span class="check"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3"><path d="M20 6L9 17l-5-5"/></svg></span><span><code style="font-family:var(--mono)">python -m eval --n 8192 --pairs 3</code></span></li>
         </ul>
         <a class="btn btn-ghost" style="margin-top:6px" href="https://github.com/zeokin/Cuda-Compute-OSS">See the quickstart</a>
       </div>
diff --git a/tests/test_landing_page_reference_regime.py b/tests/test_landing_page_reference_regime.py
new file mode 100644
index 0000000..72c4e56
--- /dev/null
+++ b/tests/test_landing_page_reference_regime.py
@@ -0,0 +1,83 @@
+"""Pin the landing page's reference-regime claims to the code (issue: stale N).
+
+`index/index.html` advertises CCO's reference regime and a copy-pasteable
+quickstart command. Those must track the real default the engines ship with --
+`strategy`/`matmul` `--n` (8192), which README.md and BENCHMARKS.md also state as
+"Reference setup: 8192 x 8192". The page had been left at the pre-8192 default of
+N=12,000 (and its KPI showed 2*12000**3 = 3.5 TFLOP), so a visitor's first
+command and headline number disagreed with every other surface in the repo.
+
+These tests re-derive the page's claims from the CLI default itself, so the
+landing page cannot silently drift away from the shipped default again.
+Pure parsing + arithmetic; no GPU needed.
+
+Run:  python tests/test_landing_page_reference_regime.py
+"""
+import os
+import re
+import sys
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from strategy.cli import build_parser as strategy_parser
+from matmul.cli import build_parser as matmul_parser
+
+_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+_PAGE = os.path.join(_ROOT, "index", "index.html")
+
+
+def _page() -> str:
+    with open(_PAGE, encoding="utf-8") as fh:
+        return fh.read()
+
+
+def _default_n() -> int:
+    n = strategy_parser().parse_args([]).n
+    assert n == matmul_parser().parse_args([]).n, "engines disagree on default --n"
+    return n
+
+
+def test_quickstart_command_uses_the_shipped_default_n():
+    """The copy-pasteable `python -m eval --n ...` on the page must be the default."""
+    shown = re.findall(r"python -m eval --n (\d+)", _page())
+    assert shown, "no `python -m eval --n <N>` quickstart found on the landing page"
+    for value in shown:
+        assert int(value) == _default_n()
+
+
+def test_reference_regime_card_matches_the_default_n():
+    """The 'CCO's reference regime' KPI card must name the same N."""
+    m = re.search(r"N = ([\d,]+)\s*&mdash;|N = ([\d,]+)\s*—\s*CCO's reference regime", _page())
+    assert m, "no 'CCO's reference regime' card found"
+    shown = int((m.group(1) or m.group(2)).replace(",", ""))
+    assert shown == _default_n()
+
+
+def test_reference_regime_flop_kpi_is_2n3_at_the_default_n():
+    """The KPI beside the reference regime is 2*N**3; check it in decimal units
+    (the same convention the 1,000 -> 2 GFLOP and 128,000 -> 4.2 PFLOP cards use)."""
+    n = _default_n()
+    expected_tflop = round(2.0 * n**3 / 1e12, 1)
+    assert expected_tflop == 1.1, f"sanity: 2*{n}**3 should be 1.1 TFLOP, got {expected_tflop}"
+    assert f"{expected_tflop} TFLOP" in _page()
+    # the pre-8192 figure (2*12000**3) must be gone
+    assert "3.5 TFLOP" not in _page()
+
+
+def test_no_stale_12000_reference_remains():
+    page = _page()
+    assert "12000" not in page and "12,000" not in page
+
+
+if __name__ == "__main__":
+    fns = [v for k, v in sorted(globals().items()) if k.startswith("test_")]
+    failed = 0
+    for fn in fns:
+        try:
+            fn()
+            print(f"PASS  {fn.__name__}")
+        except AssertionError as e:
+            failed += 1
+            print(f"FAIL  {fn.__name__}: {e}")
+    print(f"\n{len(fns) - failed}/{len(fns)} passed")
+    sys.exit(1 if failed else 0)