diff --git a/database/model_pricing_override.go b/database/model_pricing_override.go
index f86d8b455..142adda8d 100644
--- a/database/model_pricing_override.go
+++ b/database/model_pricing_override.go
@@ -329,7 +329,7 @@ func antigravityCanonicalPricingModel(model string) string {
 	}
 	lower := strings.ToLower(strings.TrimSpace(normalized))
 	if strings.HasPrefix(lower, "gemini-") {
-		for _, suffix := range []string{"-high", "-medium", "-low", "-tiered"} {
+		for _, suffix := range []string{"-xhigh", "-high", "-medium", "-low", "-tiered"} {
 			if strings.HasSuffix(lower, suffix) {
 				return strings.TrimSuffix(lower, suffix)
 			}
diff --git a/database/model_pricing_override_test.go b/database/model_pricing_override_test.go
index b192bf37d..cc93247be 100644
--- a/database/model_pricing_override_test.go
+++ b/database/model_pricing_override_test.go
@@ -131,6 +131,7 @@ func TestPricingManagementModelKeyPreservesIndependentAlias(t *testing.T) {
 		{model: "gemini-3.8-flash-low", want: "gemini-3.8-flash-low"},
 		{model: "gemini-3.8-flash-medium", want: "gemini-3.8-flash-medium"},
 		{model: "gemini-3.8-flash", want: "gemini-3.8-flash"},
+		{model: "gemini-4-hydrogen-xhigh", want: "gemini-4-hydrogen-xhigh"},
 		{model: "claude-opus-4-6-thinking", want: "claude-opus-4-6-thinking"},
 		{model: "claude-opus-5-5-high", want: "claude-opus-5-5-high"},
 	}
@@ -149,6 +150,9 @@ func TestAntigravityPricingAliasInheritance(t *testing.T) {
 	if target := PricingAliasTarget("gemini-3.8-flash-high"); target != "gemini-3.8-flash" {
 		t.Fatalf("PricingAliasTarget(gemini-3.8-flash-high) = %q, want gemini-3.8-flash", target)
 	}
+	if target := PricingAliasTarget("gemini-4-hydrogen-xhigh"); target != "gemini-4-hydrogen" {
+		t.Fatalf("PricingAliasTarget(gemini-4-hydrogen-xhigh) = %q, want gemini-4-hydrogen", target)
+	}
 	if target := PricingAliasTarget("claude-opus-4-6-thinking"); target != "claude-opus-4-6" {
 		t.Fatalf("PricingAliasTarget(claude-opus-4-6-thinking) = %q, want claude-opus-4-6", target)
 	}
@@ -162,7 +166,7 @@ func TestAntigravityPricingAliasInheritance(t *testing.T) {
 		t.Fatalf("gemini-3.8-flash-high default source = %q, want default", source)
 	}
 
-	// 2. 模拟同步源写入 gemini-3.8-flash 覆盖：变体应自动继承
+	// 2. 模拟同步源写入 gemini-3.8-flash 与 gemini-4-hydrogen 覆盖：变体应自动继承
 	syncedOverrides := map[string]ModelPricingOverride{
 		"gemini-3.8-flash": {
 			Source:      ModelPricingSourceSynced,
@@ -170,6 +174,12 @@ func TestAntigravityPricingAliasInheritance(t *testing.T) {
 			Output:      4.00,
 			CachedInput: 0.08,
 		},
+		"gemini-4-hydrogen": {
+			Source:      ModelPricingSourceSynced,
+			Input:       1.50,
+			Output:      7.50,
+			CachedInput: 0.075,
+		},
 	}
 	SetModelPricingOverrides(syncedOverrides)
 
@@ -181,6 +191,14 @@ func TestAntigravityPricingAliasInheritance(t *testing.T) {
 		t.Fatalf("gemini-3.8-flash-high source = %q, want synced", source)
 	}
 
+	hydrogenSynced := GetModelPricing("gemini-4-hydrogen-xhigh")
+	if hydrogenSynced.InputPricePerMToken != 1.50 || hydrogenSynced.OutputPricePerMToken != 7.50 || hydrogenSynced.CacheReadPricePerMToken != 0.075 {
+		t.Fatalf("gemini-4-hydrogen-xhigh should inherit synced base price: %+v", hydrogenSynced)
+	}
+	if source := ModelPricingSourceFor("gemini-4-hydrogen-xhigh"); source != ModelPricingSourceSynced {
+		t.Fatalf("gemini-4-hydrogen-xhigh source = %q, want synced", source)
+	}
+
 	// 3. 管理员显式为 high 档设置自定义价格：优先命中 alias custom
 	syncedOverrides["gemini-3.8-flash-high"] = ModelPricingOverride{
 		Source: ModelPricingSourceCustom,