diff --git a/controller/pricing.go b/controller/pricing.go
index 8252327244c4..177ddca4416e 100644
--- a/controller/pricing.go
+++ b/controller/pricing.go
@@ -23,12 +23,19 @@ func filterPricingByUsableGroups(pricing []model.Pricing, usableGroup map[string
 			filtered = append(filtered, item)
 			continue
 		}
+		usableEnableGroups := make([]string, 0, len(item.EnableGroup))
 		for _, group := range item.EnableGroup {
 			if _, ok := usableGroup[group]; ok {
-				filtered = append(filtered, item)
-				break
+				usableEnableGroups = append(usableEnableGroups, group)
 			}
 		}
+		if len(usableEnableGroups) == 0 {
+			continue
+		}
+		// item is a copy of the shared pricing cache entry; assign a fresh
+		// slice so the cached EnableGroup is never mutated across requests.
+		item.EnableGroup = usableEnableGroups
+		filtered = append(filtered, item)
 	}
 	return filtered
 }
diff --git a/controller/pricing_test.go b/controller/pricing_test.go
new file mode 100644
index 000000000000..a97d90689cd9
--- /dev/null
+++ b/controller/pricing_test.go
@@ -0,0 +1,42 @@
+package controller
+
+import (
+	"testing"
+
+	"github.com/QuantumNous/new-api/model"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFilterPricingByUsableGroupsTrimsEnableGroups(t *testing.T) {
+	pricing := []model.Pricing{
+		{ModelName: "model-mixed", EnableGroup: []string{"default", "internal"}},
+		{ModelName: "model-internal-only", EnableGroup: []string{"internal"}},
+		{ModelName: "model-all", EnableGroup: []string{"all", "internal"}},
+	}
+	usableGroup := map[string]string{"default": "default group"}
+
+	filtered := filterPricingByUsableGroups(pricing, usableGroup)
+
+	require.Len(t, filtered, 2)
+
+	assert.Equal(t, "model-mixed", filtered[0].ModelName)
+	assert.Equal(t, []string{"default"}, filtered[0].EnableGroup,
+		"groups outside the user's usable groups must not be exposed")
+
+	assert.Equal(t, "model-all", filtered[1].ModelName)
+	assert.Equal(t, []string{"all", "internal"}, filtered[1].EnableGroup,
+		"entries enabled for all groups keep their original group list")
+
+	assert.Equal(t, []string{"default", "internal"}, pricing[0].EnableGroup,
+		"the shared pricing cache must stay untouched")
+}
+
+func TestFilterPricingByUsableGroupsEmptyInputs(t *testing.T) {
+	pricing := []model.Pricing{
+		{ModelName: "model-a", EnableGroup: []string{"default"}},
+	}
+
+	assert.Empty(t, filterPricingByUsableGroups(pricing, map[string]string{}))
+	assert.Empty(t, filterPricingByUsableGroups(nil, map[string]string{"default": ""}))
+}