diff --git a/relay/adaptor/openai/adaptor.go b/relay/adaptor/openai/adaptor.go
index 6946e402..ede9fc13 100644
--- a/relay/adaptor/openai/adaptor.go
+++ b/relay/adaptor/openai/adaptor.go
@@ -82,6 +82,21 @@ func (a *Adaptor) ConvertRequest(c *gin.Context, relayMode int, request *model.G
 		}
 		request.StreamOptions.IncludeUsage = true
 	}
+
+	// o1/o1-mini/o1-preview do not support system prompt and max_tokens
+	if strings.HasPrefix(request.Model, "o1") {
+		request.MaxTokens = 0
+		request.Messages = func(raw []model.Message) (filtered []model.Message) {
+			for i := range raw {
+				if raw[i].Role != "system" {
+					filtered = append(filtered, raw[i])
+				}
+			}
+
+			return
+		}(request.Messages)
+	}
+
 	return request, nil
 }
 
diff --git a/relay/billing/ratio/model.go b/relay/billing/ratio/model.go
index f83aa70c..e7c89ca7 100644
--- a/relay/billing/ratio/model.go
+++ b/relay/billing/ratio/model.go
@@ -466,7 +466,7 @@ func GetCompletionRatio(name string, channelType int) float64 {
 		}
 		return 2
 	}
-	// including o1, o1-preview, o1-mini
+	// including o1/o1-preview/o1-mini
 	if strings.HasPrefix(name, "o1") {
 		return 4
 	}