diff --git a/backend/internal/handler/gateway_handler.go b/backend/internal/handler/gateway_handler.go
index a505f578..7e6b2f03 100644
--- a/backend/internal/handler/gateway_handler.go
+++ b/backend/internal/handler/gateway_handler.go
@@ -22,7 +22,6 @@ import (
 	"github.com/Wei-Shaw/sub2api/internal/service"
 
 	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
 )
 
 // GatewayHandler handles API gateway requests
@@ -213,53 +212,6 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 	if sessionKey != "" {
 		sessionBoundAccountID, _ = h.gatewayService.GetCachedSessionAccountID(c.Request.Context(), apiKey.GroupID, sessionKey)
 	}
-
-	// === Anthropic 内容摘要会话 Fallback 逻辑 ===
-	// 当原有会话标识无效时（sessionBoundAccountID == 0），尝试基于内容摘要链匹配
-	var anthropicDigestChain string
-	var anthropicPrefixHash string
-	var anthropicSessionUUID string
-	useAnthropicDigestFallback := sessionBoundAccountID == 0 && platform != service.PlatformGemini
-
-	if useAnthropicDigestFallback {
-		anthropicDigestChain = service.BuildAnthropicDigestChain(parsedReq)
-		if anthropicDigestChain != "" {
-			userAgent := c.GetHeader("User-Agent")
-			clientIP := ip.GetClientIP(c)
-			anthropicPrefixHash = service.GenerateGeminiPrefixHash(
-				subject.UserID,
-				apiKey.ID,
-				clientIP,
-				userAgent,
-				platform,
-				reqModel,
-			)
-
-			foundUUID, foundAccountID, found := h.gatewayService.FindAnthropicSession(
-				c.Request.Context(),
-				derefGroupID(apiKey.GroupID),
-				anthropicPrefixHash,
-				anthropicDigestChain,
-			)
-			if found {
-				sessionBoundAccountID = foundAccountID
-				anthropicSessionUUID = foundUUID
-				log.Printf("[Anthropic] Digest fallback matched: uuid=%s, accountID=%d, chain=%s",
-					foundUUID[:8], foundAccountID, truncateDigestChain(anthropicDigestChain))
-
-				if sessionKey == "" {
-					sessionKey = service.GenerateAnthropicDigestSessionKey(anthropicPrefixHash, foundUUID)
-				}
-				_ = h.gatewayService.BindStickySession(c.Request.Context(), apiKey.GroupID, sessionKey, foundAccountID)
-			} else {
-				anthropicSessionUUID = uuid.New().String()
-				if sessionKey == "" {
-					sessionKey = service.GenerateAnthropicDigestSessionKey(anthropicPrefixHash, anthropicSessionUUID)
-				}
-			}
-		}
-	}
-
 	// 判断是否真的绑定了粘性会话：有 sessionKey 且已经绑定到某个账号
 	hasBoundSession := sessionKey != "" && sessionBoundAccountID > 0
 
@@ -588,20 +540,6 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 			userAgent := c.GetHeader("User-Agent")
 			clientIP := ip.GetClientIP(c)
 
-			// 保存 Anthropic 内容摘要会话（用于 Fallback 匹配）
-			if useAnthropicDigestFallback && anthropicDigestChain != "" && anthropicPrefixHash != "" {
-				if err := h.gatewayService.SaveAnthropicSession(
-					c.Request.Context(),
-					derefGroupID(apiKey.GroupID),
-					anthropicPrefixHash,
-					anthropicDigestChain,
-					anthropicSessionUUID,
-					account.ID,
-				); err != nil {
-					log.Printf("[Anthropic] Failed to save digest session: %v", err)
-				}
-			}
-
 			// 异步记录使用量（subscription已在函数开头获取）
 			go func(result *service.ForwardResult, usedAccount *service.Account, ua, clientIP string, fcb bool) {
 				ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)