diff --git a/app/api/deepseek.ts b/app/api/deepseek.ts
index 9433e404b..06d97a0d6 100644
--- a/app/api/deepseek.ts
+++ b/app/api/deepseek.ts
@@ -8,7 +8,7 @@ import {
 import { prettyObject } from "@/app/utils/format";
 import { NextRequest, NextResponse } from "next/server";
 import { auth } from "@/app/api/auth";
-import { isModelAvailableInServer } from "@/app/utils/model";
+import { isModelNotavailableInServer } from "@/app/utils/model";
 
 const serverConfig = getServerSideConfig();
 
@@ -88,7 +88,7 @@ async function request(req: NextRequest) {
 
       // not undefined and is false
       if (
-        isModelAvailableInServer(
+        isModelNotavailableInServer(
           serverConfig.customModels,
           jsonBody?.model as string,
           ServiceProvider.Moonshot as string,
diff --git a/app/constant.ts b/app/constant.ts
index b1fca2d47..8163f51b4 100644
--- a/app/constant.ts
+++ b/app/constant.ts
@@ -287,6 +287,8 @@ export const KnowledgeCutOffDate: Record<string, string> = {
   // it's now easier to add "KnowledgeCutOffDate" instead of stupid hardcoding it, as was done previously.
   "gemini-pro": "2023-12",
   "gemini-pro-vision": "2023-12",
+  "deepseek-chat": "2024-07",
+  "deepseek-coder": "2024-07",
 };
 
 export const DEFAULT_TTS_ENGINE = "OpenAI-TTS";