diff --git a/backend/internal/domain/constants.go b/backend/internal/domain/constants.go
index 3be604daff..378b05501c 100644
--- a/backend/internal/domain/constants.go
+++ b/backend/internal/domain/constants.go
@@ -145,6 +145,12 @@ var DefaultAntigravityModelMapping = map[string]string{
 	"gemini-3.6-flash-low":    "gemini-3.6-flash-low",
 	"gemini-3.6-flash-medium": "gemini-3.6-flash-medium",
 	"gemini-3.6-flash-tiered": "gemini-3.6-flash-tiered",
+	// Gemini 3.7 Flash tiered models
+	"gemini-3.7-flash":        "gemini-3.7-flash",
+	"gemini-3.7-flash-high":   "gemini-3.7-flash-high",
+	"gemini-3.7-flash-low":    "gemini-3.7-flash-low",
+	"gemini-3.7-flash-medium": "gemini-3.7-flash-medium",
+	"gemini-3.7-flash-tiered": "gemini-3.7-flash-tiered",
 	// Gemini 3.8 Flash tiered models
 	"gemini-3.8-flash":        "gemini-3.8-flash",
 	"gemini-3.8-flash-high":   "gemini-3.8-flash-high",
diff --git a/backend/internal/domain/constants_test.go b/backend/internal/domain/constants_test.go
index 7813cbbc7a..de7d882955 100644
--- a/backend/internal/domain/constants_test.go
+++ b/backend/internal/domain/constants_test.go
@@ -89,6 +89,14 @@ func TestDefaultAntigravityModelMapping_Gemini36FlashModels(t *testing.T) {
 	}
 }
 
+func TestDefaultAntigravityModelMapping_Gemini37FlashModels(t *testing.T) {
+	for _, model := range []string{"gemini-3.7-flash", "gemini-3.7-flash-high", "gemini-3.7-flash-low", "gemini-3.7-flash-medium", "gemini-3.7-flash-tiered"} {
+		if got := DefaultAntigravityModelMapping[model]; got != model {
+			t.Fatalf("expected %s to map to itself, got %q", model, got)
+		}
+	}
+}
+
 func TestDefaultAntigravityModelMapping_Gemini38FlashModels(t *testing.T) {
 	for _, model := range []string{"gemini-3.8-flash", "gemini-3.8-flash-high", "gemini-3.8-flash-low", "gemini-3.8-flash-medium", "gemini-3.8-flash-tiered"} {
 		if got := DefaultAntigravityModelMapping[model]; got != model {
diff --git a/backend/internal/pkg/antigravity/claude_types.go b/backend/internal/pkg/antigravity/claude_types.go
index 811c810546..23601c0457 100644
--- a/backend/internal/pkg/antigravity/claude_types.go
+++ b/backend/internal/pkg/antigravity/claude_types.go
@@ -184,6 +184,11 @@ var geminiModels = []modelDef{
 	{ID: "gemini-3.6-flash-low", DisplayName: "Gemini 3.6 Flash Low", CreatedAt: "2026-07-21T00:00:00Z", IsReasoning: true},
 	{ID: "gemini-3.6-flash-medium", DisplayName: "Gemini 3.6 Flash Medium", CreatedAt: "2026-07-21T00:00:00Z", IsReasoning: true},
 	{ID: "gemini-3.6-flash-tiered", DisplayName: "Gemini 3.6 Flash", CreatedAt: "2026-07-21T00:00:00Z", IsReasoning: true},
+	{ID: "gemini-3.7-flash", DisplayName: "Gemini 3.7 Flash", CreatedAt: "2026-08-13T00:00:00Z"},
+	{ID: "gemini-3.7-flash-high", DisplayName: "Gemini 3.7 Flash High", CreatedAt: "2026-08-13T00:00:00Z", IsReasoning: true},
+	{ID: "gemini-3.7-flash-low", DisplayName: "Gemini 3.7 Flash Low", CreatedAt: "2026-08-13T00:00:00Z", IsReasoning: true},
+	{ID: "gemini-3.7-flash-medium", DisplayName: "Gemini 3.7 Flash Medium", CreatedAt: "2026-08-13T00:00:00Z", IsReasoning: true},
+	{ID: "gemini-3.7-flash-tiered", DisplayName: "Gemini 3.7 Flash", CreatedAt: "2026-08-13T00:00:00Z", IsReasoning: true},
 	{ID: "gemini-3.8-flash", DisplayName: "Gemini 3.8 Flash", CreatedAt: "2026-09-02T00:00:00Z"},
 	{ID: "gemini-3.8-flash-high", DisplayName: "Gemini 3.8 Flash High", CreatedAt: "2026-09-02T00:00:00Z", IsReasoning: true},
 	{ID: "gemini-3.8-flash-low", DisplayName: "Gemini 3.8 Flash Low", CreatedAt: "2026-09-02T00:00:00Z", IsReasoning: true},
diff --git a/backend/internal/pkg/antigravity/claude_types_test.go b/backend/internal/pkg/antigravity/claude_types_test.go
index 860a9db28c..4b49fdb9b1 100644
--- a/backend/internal/pkg/antigravity/claude_types_test.go
+++ b/backend/internal/pkg/antigravity/claude_types_test.go
@@ -26,6 +26,11 @@ func TestDefaultModels_ContainsNewAndLegacyImageModels(t *testing.T) {
 		"gemini-3.6-flash-low",
 		"gemini-3.6-flash-medium",
 		"gemini-3.6-flash-tiered",
+		"gemini-3.7-flash",
+		"gemini-3.7-flash-high",
+		"gemini-3.7-flash-low",
+		"gemini-3.7-flash-medium",
+		"gemini-3.7-flash-tiered",
 		"gemini-3.8-flash",
 		"gemini-3.8-flash-high",
 		"gemini-3.8-flash-low",
diff --git a/backend/internal/service/account.go b/backend/internal/service/account.go
index a962d94159..15fd4d16ce 100644
--- a/backend/internal/service/account.go
+++ b/backend/internal/service/account.go
@@ -662,6 +662,11 @@ func (a *Account) resolveModelMapping(rawMapping map[string]any) map[string]stri
 				"gemini-3.6-flash-low",
 				"gemini-3.6-flash-medium",
 				"gemini-3.6-flash-tiered",
+				"gemini-3.7-flash",
+				"gemini-3.7-flash-high",
+				"gemini-3.7-flash-low",
+				"gemini-3.7-flash-medium",
+				"gemini-3.7-flash-tiered",
 				"gemini-3.8-flash",
 				"gemini-3.8-flash-high",
 				"gemini-3.8-flash-low",
diff --git a/backend/internal/service/billing_service.go b/backend/internal/service/billing_service.go
index 2fe2a913f4..9d9fdff498 100644
--- a/backend/internal/service/billing_service.go
+++ b/backend/internal/service/billing_service.go
@@ -400,6 +400,18 @@ func (s *BillingService) initFallbackPricing() {
 		SupportsCacheBreakdown: false,
 	}
 
+	// Gemini 3.7 Flash (Google AI pricing: $0.75 input / $3.75 output /
+	// $0.075 cached input per MTok, promotional through 2026-12-31; official
+	// rates double to $1.50/$7.50/$0.15 from 2027-01-01). Antigravity's
+	// -high/-low/-medium/-tiered aliases are matched below so unavailable
+	// remote pricing never records token-bearing requests at $0.
+	s.fallbackPrices["gemini-3.7-flash"] = &ModelPricing{
+		InputPricePerToken:     0.75e-6,
+		OutputPricePerToken:    3.75e-6,
+		CacheReadPricePerToken: 0.075e-6,
+		SupportsCacheBreakdown: false,
+	}
+
 	// Gemini 3.8 Flash (Google AI pricing: $0.75 input / $3.75 output /
 	// $0.075 cached input per MTok, promotional through 2026-12-31; official
 	// rates double to $1.50/$7.50/$0.15 from 2027-01-01). Antigravity's
@@ -863,6 +875,9 @@ func (s *BillingService) getFallbackPricing(model string) *ModelPricing {
 	if strings.Contains(modelLower, "gemini-3.6-flash") || strings.Contains(modelLower, "gemini-3-6-flash") {
 		return s.fallbackPrices["gemini-3.6-flash"]
 	}
+	if strings.Contains(modelLower, "gemini-3.7-flash") || strings.Contains(modelLower, "gemini-3-7-flash") {
+		return s.fallbackPrices["gemini-3.7-flash"]
+	}
 	if strings.Contains(modelLower, "gemini-3.8-flash") || strings.Contains(modelLower, "gemini-3-8-flash") {
 		return s.fallbackPrices["gemini-3.8-flash"]
 	}
diff --git a/backend/internal/service/pricing_service.go b/backend/internal/service/pricing_service.go
index 84b6d448e0..e0b344ac60 100644
--- a/backend/internal/service/pricing_service.go
+++ b/backend/internal/service/pricing_service.go
@@ -1116,7 +1116,7 @@ func normalizeModelNameForPricing(model string) string {
 // behavior, not the published token rate, so this keeps -high/-low/-medium and
 // -tiered requests on the same price card as their base model.
 func normalizeGeminiThinkingTierAlias(model string) string {
-	for _, baseModel := range []string{"gemini-3.6-flash", "gemini-3.8-flash"} {
+	for _, baseModel := range []string{"gemini-3.6-flash", "gemini-3.7-flash", "gemini-3.8-flash"} {
 		for _, tier := range []string{"-high", "-low", "-medium", "-tiered"} {
 			if model == baseModel+tier {
 				return baseModel
diff --git a/backend/internal/service/pricing_service_test.go b/backend/internal/service/pricing_service_test.go
index dc7674ef5c..bfbac756ff 100644
--- a/backend/internal/service/pricing_service_test.go
+++ b/backend/internal/service/pricing_service_test.go
@@ -533,6 +533,51 @@ func TestBillingService_Gemini36FlashThinkingTierFallbacksAreBillable(t *testing
 	}
 }
 
+func TestPricingService_Gemini37FlashThinkingTiersUseBasePricing(t *testing.T) {
+	basePricing := &LiteLLMModelPricing{
+		InputCostPerToken:       0.75e-6,
+		OutputCostPerToken:      3.75e-6,
+		CacheReadInputTokenCost: 0.075e-6,
+	}
+	svc := &PricingService{pricingData: map[string]*LiteLLMModelPricing{
+		"gemini-3.7-flash": basePricing,
+	}}
+
+	for _, model := range []string{
+		"gemini-3.7-flash",
+		"gemini-3.7-flash-high",
+		"gemini-3.7-flash-low",
+		"gemini-3.7-flash-medium",
+		"gemini-3.7-flash-tiered",
+	} {
+		t.Run(model, func(t *testing.T) {
+			require.Same(t, basePricing, svc.GetModelPricing(model))
+		})
+	}
+}
+
+func TestBillingService_Gemini37FlashThinkingTierFallbacksAreBillable(t *testing.T) {
+	svc := NewBillingService(&config.Config{}, nil)
+	tokens := UsageTokens{InputTokens: 1_000_000, OutputTokens: 1_000_000, CacheReadTokens: 1_000_000}
+
+	for _, model := range []string{
+		"gemini-3.7-flash",
+		"gemini-3.7-flash-high",
+		"gemini-3.7-flash-low",
+		"gemini-3.7-flash-medium",
+		"gemini-3.7-flash-tiered",
+	} {
+		t.Run(model, func(t *testing.T) {
+			cost, err := svc.CalculateCost(model, tokens, 1)
+			require.NoError(t, err)
+			require.InDelta(t, 0.75, cost.InputCost, 1e-12)
+			require.InDelta(t, 3.75, cost.OutputCost, 1e-12)
+			require.InDelta(t, 0.075, cost.CacheReadCost, 1e-12)
+			require.InDelta(t, 4.575, cost.TotalCost, 1e-12)
+		})
+	}
+}
+
 func TestPricingService_Gemini38FlashThinkingTiersUseBasePricing(t *testing.T) {
 	basePricing := &LiteLLMModelPricing{
 		InputCostPerToken:       0.75e-6,