diff --git a/addition/generation/api.go b/addition/generation/api.go
index 466768b..7128cf7 100644
--- a/addition/generation/api.go
+++ b/addition/generation/api.go
@@ -5,8 +5,9 @@ import (
 	"chat/globals"
 	"chat/utils"
 	"fmt"
-	"github.com/gin-gonic/gin"
 	"strings"
+
+	"github.com/gin-gonic/gin"
 )
 
 type WebsocketGenerationForm struct {
@@ -53,7 +54,7 @@ func GenerateAPI(c *gin.Context) {
 		return
 	}
 
-	check, plan := auth.CanEnableModelWithSubscription(db, cache, user, form.Model)
+	check, plan := auth.CanEnableModelWithSubscription(db, cache, user, form.Model, []globals.Message{})
 	if check != nil {
 		conn.Send(globals.GenerationSegmentResponse{
 			Message: check.Error(),
diff --git a/auth/rule.go b/auth/rule.go
index f4416a1..8cdb6c1 100644
--- a/auth/rule.go
+++ b/auth/rule.go
@@ -4,6 +4,10 @@ import (
 	"chat/channel"
 	"database/sql"
 	"fmt"
+
+	"chat/globals"
+	"chat/utils"
+
 	"github.com/go-redis/redis/v8"
 )
 
@@ -11,10 +15,11 @@ const (
 	ErrNotAuthenticated = "not authenticated error (model: %s)"
 	ErrNotSetPrice      = "the price of the model is not set (model: %s)"
 	ErrNotEnoughQuota   = "user quota is not enough error (model: %s, minimum quota: %0.2f, your quota: %0.2f)"
+	ErrEstimatedCost    = "estimated cost exceeds user quota (model: %s, estimated cost: %0.2f, your quota: %0.2f)"
 )
 
 // CanEnableModel returns whether the model can be enabled (without subscription)
-func CanEnableModel(db *sql.DB, user *User, model string) error {
+func CanEnableModel(db *sql.DB, user *User, model string, messages []globals.Message) error {
 	isAuth := user != nil
 	isAdmin := isAuth && user.IsAdmin(db)
 
@@ -37,21 +42,23 @@ func CanEnableModel(db *sql.DB, user *User, model string) error {
 		return fmt.Errorf(ErrNotAuthenticated, model)
 	}
 
-	// return if the user is authenticated and has enough quota
-	limit := charge.GetLimit()
+	// Calculate estimated input cost
+	inputTokens := utils.NumTokensFromMessages(messages, model, false)
+	estimatedInputCost := float32(inputTokens) / 1000 * charge.GetInput()
 
+	// Get user's current quota
 	quota := user.GetQuota(db)
-	if quota < limit {
-		return fmt.Errorf(ErrNotEnoughQuota, model, limit, quota)
+	if quota < estimatedInputCost {
+		return fmt.Errorf(ErrEstimatedCost, model, estimatedInputCost, quota)
 	}
 
 	return nil
 }
 
-func CanEnableModelWithSubscription(db *sql.DB, cache *redis.Client, user *User, model string) (canEnable error, usePlan bool) {
+func CanEnableModelWithSubscription(db *sql.DB, cache *redis.Client, user *User, model string, messages []globals.Message) (canEnable error, usePlan bool) {
 	// use subscription quota first
 	if user != nil && HandleSubscriptionUsage(db, cache, user, model) {
 		return nil, true
 	}
-	return CanEnableModel(db, user, model), false
+	return CanEnableModel(db, user, model, messages), false
 }
diff --git a/manager/chat.go b/manager/chat.go
index 4185c62..43f2783 100644
--- a/manager/chat.go
+++ b/manager/chat.go
@@ -202,7 +202,7 @@ func ChatHandler(conn *Connection, user *auth.User, instance *conversation.Conve
 	model := instance.GetModel()
 	segment := adapter.ClearMessages(model, web.ToChatSearched(instance, restart))
 
-	check, plan := auth.CanEnableModelWithSubscription(db, cache, user, model)
+	check, plan := auth.CanEnableModelWithSubscription(db, cache, user, model, segment)
 	conn.Send(globals.ChatSegmentResponse{
 		Conversation: instance.GetId(),
 	})
diff --git a/manager/chat_completions.go b/manager/chat_completions.go
index 36ce60b..0aa30e5 100644
--- a/manager/chat_completions.go
+++ b/manager/chat_completions.go
@@ -28,12 +28,12 @@ func supportRelayPlan() bool {
 	return channel.SystemInstance.SupportRelayPlan()
 }
 
-func checkEnableState(db *sql.DB, cache *redis.Client, user *auth.User, model string) (state error, plan bool) {
+func checkEnableState(db *sql.DB, cache *redis.Client, user *auth.User, model string, messages []globals.Message) (state error, plan bool) {
 	if supportRelayPlan() {
-		return auth.CanEnableModelWithSubscription(db, cache, user, model)
+		return auth.CanEnableModelWithSubscription(db, cache, user, model, messages)
 	}
 
-	return auth.CanEnableModel(db, user, model), false
+	return auth.CanEnableModel(db, user, model, messages), false
 }
 
 func ChatRelayAPI(c *gin.Context) {
@@ -80,7 +80,7 @@ func ChatRelayAPI(c *gin.Context) {
 		form.Official = true
 	}
 
-	check, plan := checkEnableState(db, cache, user, form.Model)
+	check, plan := checkEnableState(db, cache, user, form.Model, messages)
 	if check != nil {
 		sendErrorResponse(c, check, "quota_exceeded_error")
 		return
diff --git a/manager/completions.go b/manager/completions.go
index f0762df..c0fcc10 100644
--- a/manager/completions.go
+++ b/manager/completions.go
@@ -28,7 +28,7 @@ func NativeChatHandler(c *gin.Context, user *auth.User, model string, message []
 
 	db := utils.GetDBFromContext(c)
 	cache := utils.GetCacheFromContext(c)
-	check, plan := auth.CanEnableModelWithSubscription(db, cache, user, model)
+	check, plan := auth.CanEnableModelWithSubscription(db, cache, user, model, segment)
 
 	if check != nil {
 		return check.Error(), 0
diff --git a/manager/images.go b/manager/images.go
index 5e80011..3317a1f 100644
--- a/manager/images.go
+++ b/manager/images.go
@@ -54,7 +54,7 @@ func ImagesRelayAPI(c *gin.Context) {
 		form.Model = strings.TrimSuffix(form.Model, "-official")
 	}
 
-	check := auth.CanEnableModel(db, user, form.Model)
+	check := auth.CanEnableModel(db, user, form.Model, []globals.Message{})
 	if check != nil {
 		sendErrorResponse(c, check, "quota_exceeded_error")
 		return