diff --git a/common/init.go b/common/init.go
index 4ac7d238..e9cfc98b 100644
--- a/common/init.go
+++ b/common/init.go
@@ -131,7 +131,7 @@ func initConstantEnv() {
 	constant.StreamingTimeout = GetEnvOrDefault("STREAMING_TIMEOUT", 300)
 	constant.DifyDebug = GetEnvOrDefaultBool("DIFY_DEBUG", true)
 	constant.MaxFileDownloadMB = GetEnvOrDefault("MAX_FILE_DOWNLOAD_MB", 64)
-	constant.StreamScannerMaxBufferMB = GetEnvOrDefault("STREAM_SCANNER_MAX_BUFFER_MB", 64)
+	constant.StreamScannerMaxBufferMB = GetEnvOrDefault("STREAM_SCANNER_MAX_BUFFER_MB", 128)
 	// MaxRequestBodyMB 请求体最大大小（解压后），用于防止超大请求/zip bomb导致内存暴涨
 	constant.MaxRequestBodyMB = GetEnvOrDefault("MAX_REQUEST_BODY_MB", 128)
 	// ForceStreamOption 覆盖请求参数，强制返回usage信息
diff --git a/setting/ratio_setting/model_ratio.go b/setting/ratio_setting/model_ratio.go
index c2050871..62fc8b3e 100644
--- a/setting/ratio_setting/model_ratio.go
+++ b/setting/ratio_setting/model_ratio.go
@@ -510,6 +510,9 @@ func getHardcodedCompletionModelRatio(name string) (float64, bool) {
 		// gpt-5 匹配
 		if strings.HasPrefix(name, "gpt-5") {
 			if strings.HasPrefix(name, "gpt-5.4") {
+				if strings.HasPrefix(name, "gpt-5.4-nano") {
+					return 6.25, true
+				}
 				return 6, true
 			}
 			return 8, true