diff --git a/common/model-ratio.go b/common/model-ratio.go
index 7e36105..ca669d1 100644
--- a/common/model-ratio.go
+++ b/common/model-ratio.go
@@ -6,7 +6,7 @@ import (
 	"time"
 )
 
-// ModelRatio
+// modelRatio
 // https://platform.openai.com/docs/models/model-endpoint-compatibility
 // https://cloud.baidu.com/doc/WENXINWORKSHOP/s/Blfmc9dlf
 // https://openai.com/pricing
@@ -114,14 +114,14 @@ var DefaultModelPrice = map[string]float64{
 	"swap_face":         0.05,
 }
 
-var ModelPrice = map[string]float64{}
-var ModelRatio = map[string]float64{}
+var modelPrice map[string]float64 = nil
+var modelRatio map[string]float64 = nil
 
 func ModelPrice2JSONString() string {
-	if len(ModelPrice) == 0 {
-		ModelPrice = DefaultModelPrice
+	if modelPrice == nil {
+		modelPrice = DefaultModelPrice
 	}
-	jsonBytes, err := json.Marshal(ModelPrice)
+	jsonBytes, err := json.Marshal(modelPrice)
 	if err != nil {
 		SysError("error marshalling model price: " + err.Error())
 	}
@@ -129,18 +129,18 @@ func ModelPrice2JSONString() string {
 }
 
 func UpdateModelPriceByJSONString(jsonStr string) error {
-	ModelPrice = make(map[string]float64)
-	return json.Unmarshal([]byte(jsonStr), &ModelPrice)
+	modelPrice = make(map[string]float64)
+	return json.Unmarshal([]byte(jsonStr), &modelPrice)
 }
 
 func GetModelPrice(name string, printErr bool) float64 {
-	if len(ModelPrice) == 0 {
-		ModelPrice = DefaultModelPrice
+	if modelPrice == nil {
+		modelPrice = DefaultModelPrice
 	}
 	if strings.HasPrefix(name, "gpt-4-gizmo") {
 		name = "gpt-4-gizmo-*"
 	}
-	price, ok := ModelPrice[name]
+	price, ok := modelPrice[name]
 	if !ok {
 		if printErr {
 			SysError("model price not found: " + name)
@@ -151,10 +151,10 @@ func GetModelPrice(name string, printErr bool) float64 {
 }
 
 func ModelRatio2JSONString() string {
-	if len(ModelRatio) == 0 {
-		ModelRatio = DefaultModelRatio
+	if modelRatio == nil {
+		modelRatio = DefaultModelRatio
 	}
-	jsonBytes, err := json.Marshal(ModelRatio)
+	jsonBytes, err := json.Marshal(modelRatio)
 	if err != nil {
 		SysError("error marshalling model ratio: " + err.Error())
 	}
@@ -162,18 +162,18 @@ func ModelRatio2JSONString() string {
 }
 
 func UpdateModelRatioByJSONString(jsonStr string) error {
-	ModelRatio = make(map[string]float64)
-	return json.Unmarshal([]byte(jsonStr), &ModelRatio)
+	modelRatio = make(map[string]float64)
+	return json.Unmarshal([]byte(jsonStr), &modelRatio)
 }
 
 func GetModelRatio(name string) float64 {
-	if len(ModelRatio) == 0 {
-		ModelRatio = DefaultModelRatio
+	if modelRatio == nil {
+		modelRatio = DefaultModelRatio
 	}
 	if strings.HasPrefix(name, "gpt-4-gizmo") {
 		name = "gpt-4-gizmo-*"
 	}
-	ratio, ok := ModelRatio[name]
+	ratio, ok := modelRatio[name]
 	if !ok {
 		SysError("model ratio not found: " + name)
 		return 30
diff --git a/model/option.go b/model/option.go
index 46e41da..6483e26 100644
--- a/model/option.go
+++ b/model/option.go
@@ -78,8 +78,8 @@ func InitOptionMap() {
 	common.OptionMap["QuotaForInvitee"] = strconv.Itoa(common.QuotaForInvitee)
 	common.OptionMap["QuotaRemindThreshold"] = strconv.Itoa(common.QuotaRemindThreshold)
 	common.OptionMap["PreConsumedQuota"] = strconv.Itoa(common.PreConsumedQuota)
-	common.OptionMap["ModelRatio"] = common.ModelRatio2JSONString()
-	common.OptionMap["ModelPrice"] = common.ModelPrice2JSONString()
+	common.OptionMap["modelRatio"] = common.ModelRatio2JSONString()
+	common.OptionMap["modelPrice"] = common.ModelPrice2JSONString()
 	common.OptionMap["GroupRatio"] = common.GroupRatio2JSONString()
 	common.OptionMap["TopUpLink"] = common.TopUpLink
 	common.OptionMap["ChatLink"] = common.ChatLink
@@ -271,11 +271,11 @@ func updateOptionMap(key string, value string) (err error) {
 		common.DataExportInterval, _ = strconv.Atoi(value)
 	case "DataExportDefaultTime":
 		common.DataExportDefaultTime = value
-	case "ModelRatio":
+	case "modelRatio":
 		err = common.UpdateModelRatioByJSONString(value)
 	case "GroupRatio":
 		err = common.UpdateGroupRatioByJSONString(value)
-	case "ModelPrice":
+	case "modelPrice":
 		err = common.UpdateModelPriceByJSONString(value)
 	case "TopUpLink":
 		common.TopUpLink = value
diff --git a/service/token_counter.go b/service/token_counter.go
index 4769dab..2147e88 100644
--- a/service/token_counter.go
+++ b/service/token_counter.go
@@ -29,7 +29,7 @@ func InitTokenEncoders() {
 	if err != nil {
 		common.FatalLog(fmt.Sprintf("failed to get gpt-4 token encoder: %s", err.Error()))
 	}
-	for model, _ := range common.ModelRatio {
+	for model, _ := range common.DefaultModelRatio {
 		if strings.HasPrefix(model, "gpt-3.5") {
 			tokenEncoderMap[model] = gpt35TokenEncoder
 		} else if strings.HasPrefix(model, "gpt-4") {