diff --git a/backend/internal/service/pricing_service.go b/backend/internal/service/pricing_service.go
index 0ade72cd..bad08894 100644
--- a/backend/internal/service/pricing_service.go
+++ b/backend/internal/service/pricing_service.go
@@ -651,7 +651,8 @@ func (s *PricingService) matchByModelFamily(model string) *LiteLLMModelPricing {
 // 回退顺序：
 // 1. gpt-5.2-codex -> gpt-5.2（去掉后缀如 -codex, -mini, -max 等）
 // 2. gpt-5.2-20251222 -> gpt-5.2（去掉日期版本号）
-// 3. 最终回退到 DefaultTestModel (gpt-5.1-codex)
+// 3. gpt-5.3-codex -> gpt-5.2-codex
+// 4. 最终回退到 DefaultTestModel (gpt-5.1-codex)
 func (s *PricingService) matchOpenAIModel(model string) *LiteLLMModelPricing {
 	// 尝试的回退变体
 	variants := s.generateOpenAIModelVariants(model, openAIModelDatePattern)
@@ -663,6 +664,13 @@ func (s *PricingService) matchOpenAIModel(model string) *LiteLLMModelPricing {
 		}
 	}
 
+	if strings.HasPrefix(model, "gpt-5.3-codex") {
+		if pricing, ok := s.pricingData["gpt-5.2-codex"]; ok {
+			log.Printf("[Pricing] OpenAI fallback matched %s -> %s", model, "gpt-5.2-codex")
+			return pricing
+		}
+	}
+
 	// 最终回退到 DefaultTestModel
 	defaultModel := strings.ToLower(openai.DefaultTestModel)
 	if pricing, ok := s.pricingData[defaultModel]; ok {