diff --git a/src/web-server/model-pricing.ts b/src/web-server/model-pricing.ts
index 25127406..7c01c32e 100644
--- a/src/web-server/model-pricing.ts
+++ b/src/web-server/model-pricing.ts
@@ -296,6 +296,10 @@ const PRICING_REGISTRY: Record<string, ModelPricing> = {
       fast: OPUS_46_47_FAST_RATES,
     },
   },
+  // Legacy pricing-only entry for historical analytics data; this id has no
+  // catalog model (Opus 4.7 moved to adaptive thinking levels in 84dc4e24, so
+  // there is no separate -thinking variant). Kept so older usage records still
+  // resolve to the correct rate. No fast tier: the id is never requested live.
   'claude-opus-4-7-thinking': {
     inputPerMillion: 5.0,
     outputPerMillion: 25.0,
diff --git a/tests/unit/model-pricing.test.ts b/tests/unit/model-pricing.test.ts
index 95b6c7f1..16652330 100644
--- a/tests/unit/model-pricing.test.ts
+++ b/tests/unit/model-pricing.test.ts
@@ -223,6 +223,14 @@ describe('model-pricing', () => {
       expect(opus48fastDated.cacheReadPerMillion).toBe(1.0);
     });
 
+    it('should preserve serviceTiers metadata when applying tier rates', () => {
+      // applyServiceTier must keep the serviceTiers map on the returned object
+      // so callers can still inspect available tiers after rate substitution.
+      const opus48fast = getModelPricing('claude-opus-4-8', { serviceTier: 'fast' });
+      expect(opus48fast.serviceTiers).toBeDefined();
+      expect(opus48fast.serviceTiers?.fast).toBeDefined();
+    });
+
     it('should fall back to standard rates when serviceTier is unknown', () => {
       // Unknown tier names must not throw; revert to base pricing transparently.
       const opus48 = getModelPricing('claude-opus-4-8', { serviceTier: 'enterprise-mythos' });