diff --git a/api/app/clients/OpenAIClient.js b/api/app/clients/OpenAIClient.js
index c6a6bcc68e..091a36919e 100644
--- a/api/app/clients/OpenAIClient.js
+++ b/api/app/clients/OpenAIClient.js
@@ -475,7 +475,9 @@ class OpenAIClient extends BaseClient {
       promptPrefix = this.augmentedPrompt + promptPrefix;
     }
 
-    if (promptPrefix && this.isOmni !== true) {
+    const noSystemModelRegex = /\b(o1-preview|o1-mini)\b/i.test(this.modelOptions.model);
+
+    if (promptPrefix && !noSystemModelRegex) {
       promptPrefix = `Instructions:\n${promptPrefix.trim()}`;
       instructions = {
         role: 'system',
@@ -503,7 +505,7 @@ class OpenAIClient extends BaseClient {
     };
 
     /** EXPERIMENTAL */
-    if (promptPrefix && this.isOmni === true) {
+    if (promptPrefix && noSystemModelRegex) {
       const lastUserMessageIndex = payload.findLastIndex((message) => message.role === 'user');
       if (lastUserMessageIndex !== -1) {
         if (Array.isArray(payload[lastUserMessageIndex].content)) {
@@ -1227,9 +1229,9 @@ ${convo}
 
         opts.baseURL = this.langchainProxy
           ? constructAzureURL({
-            baseURL: this.langchainProxy,
-            azureOptions: this.azure,
-          })
+              baseURL: this.langchainProxy,
+              azureOptions: this.azure,
+            })
           : this.azureEndpoint.split(/(?<!\/)\/(chat|completion)\//)[0];
 
         opts.defaultQuery = { 'api-version': this.azure.azureOpenAIApiVersion };
diff --git a/api/server/controllers/agents/client.js b/api/server/controllers/agents/client.js
index a506c18ff3..9649e0cde7 100644
--- a/api/server/controllers/agents/client.js
+++ b/api/server/controllers/agents/client.js
@@ -58,7 +58,7 @@ const payloadParser = ({ req, agent, endpoint }) => {
 
 const legacyContentEndpoints = new Set([KnownEndpoints.groq, KnownEndpoints.deepseek]);
 
-const noSystemModelRegex = [/\b(o1)\b/gi];
+const noSystemModelRegex = [/\b(o1-preview|o1-mini)\b/gi];
 
 // const { processMemory, memoryInstructions } = require('~/server/services/Endpoints/agents/memory');
 // const { getFormattedMemories } = require('~/models/Memory');