diff --git a/src/hooks/caveman-stats.js b/src/hooks/caveman-stats.js
index 008603b4..acef7ba5 100644
--- a/src/hooks/caveman-stats.js
+++ b/src/hooks/caveman-stats.js
@@ -22,13 +22,20 @@ const COMPRESSION = { 'full': 0.65 };
 // Match by model id prefix so this stays correct across point releases
 // (e.g. claude-sonnet-4-20250514, claude-sonnet-4-7). Update from
 // https://www.anthropic.com/pricing if a release changes the tier.
+// Most-specific prefixes MUST come first — priceForModel returns the first match.
 const MODEL_OUTPUT_PRICE_PER_M = [
-  ['claude-opus-4',     75.00],
-  ['claude-sonnet-4',   15.00],
-  ['claude-haiku-4',     4.00],
-  ['claude-3-5-sonnet', 15.00],
-  ['claude-3-5-haiku',   4.00],
-  ['claude-3-opus',     75.00],
+  // Legacy Opus 4.0 / 4.1 (pre-4.5) billed at the old $75/M output tier,
+  // including the dated ids (e.g. claude-opus-4-20250514).
+  ['claude-opus-4-0',    75.00],
+  ['claude-opus-4-1',    75.00],
+  ['claude-opus-4-2025', 75.00],
+  // Opus 4.5–4.8 dropped to $25/M output (rate card held since 4.5).
+  ['claude-opus-4',      25.00],
+  ['claude-sonnet-4',    15.00],
+  ['claude-haiku-4',      5.00],   // Haiku 4.5 = $5/M output
+  ['claude-3-5-sonnet',  15.00],
+  ['claude-3-5-haiku',    4.00],
+  ['claude-3-opus',      75.00],
 ];
 
 function priceForModel(model) {
diff --git a/tests/test_caveman_stats.js b/tests/test_caveman_stats.js
index 85270c29..e10694b2 100644
--- a/tests/test_caveman_stats.js
+++ b/tests/test_caveman_stats.js
@@ -160,10 +160,12 @@ test('omits USD line when model is unknown', (tmp) => {
 
 test('priceForModel matches by prefix across point releases', () => {
   const { priceForModel } = require(path.join(ROOT, 'src', 'hooks', 'caveman-stats.js'));
-  assert.strictEqual(priceForModel('claude-opus-4-7'), 75.00);
+  assert.strictEqual(priceForModel('claude-opus-4-7'), 25.00);
+  assert.strictEqual(priceForModel('claude-opus-4-8'), 25.00);
   assert.strictEqual(priceForModel('claude-opus-4-20250101'), 75.00);
+  assert.strictEqual(priceForModel('claude-opus-4-1-20250805'), 75.00);
   assert.strictEqual(priceForModel('claude-sonnet-4-7-20260315'), 15.00);
-  assert.strictEqual(priceForModel('claude-haiku-4-5'), 4.00);
+  assert.strictEqual(priceForModel('claude-haiku-4-5'), 5.00);
   assert.strictEqual(priceForModel('claude-3-5-sonnet-20241022'), 15.00);
   assert.strictEqual(priceForModel(null), null);
   assert.strictEqual(priceForModel('gpt-4'), null);