From 7f026546f85484aa4182d56a13eefc1d52022dfb Mon Sep 17 00:00:00 2001
From: Javi-vahe <14846631+Javi-vahe@users.noreply.github.com>
Date: Wed, 3 Jun 2026 21:52:02 +0800
Subject: [PATCH 1/2] fix(chatopenai): support stop in base options

---
 .../nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/packages/components/nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts b/packages/components/nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts
index 03c13fee9b0..db8d50ae68c 100644
--- a/packages/components/nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts
+++ b/packages/components/nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts
@@ -286,6 +286,25 @@ class ChatOpenAI_ChatModels implements INode {
             }
         }
 
+        if (parsedBaseOptions?.stop) {
+            const stop = parsedBaseOptions.stop
+
+            if (!obj.stop) {
+                obj.stop = Array.isArray(stop)
+                    ? stop.map((item) => String(item).trim()).filter(Boolean)
+                    : String(stop)
+                          .split(',')
+                          .map((item) => item.trim())
+                          .filter(Boolean)
+            }
+
+            delete parsedBaseOptions.stop
+
+            if (Object.keys(parsedBaseOptions).length === 0) {
+                parsedBaseOptions = undefined
+            }
+        }
+
         if (basePath || parsedBaseOptions) {
             obj.configuration = {
                 baseURL: basePath,

From 6b84689c3305658795a9b86cdf0e523e487c2e91 Mon Sep 17 00:00:00 2001
From: Javi-vahe <14846631+Javi-vahe@users.noreply.github.com>
Date: Sat, 6 Jun 2026 16:30:38 +0800
Subject: [PATCH 2/2] fix(chatopenai): avoid mutating base options

---
 .../nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts       | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/packages/components/nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts b/packages/components/nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts
index db8d50ae68c..efe39111919 100644
--- a/packages/components/nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts
+++ b/packages/components/nodes/chatmodels/ChatOpenAI/ChatOpenAI.ts
@@ -280,16 +280,17 @@ class ChatOpenAI_ChatModels implements INode {
 
         if (baseOptions) {
             try {
-                parsedBaseOptions = typeof baseOptions === 'object' ? baseOptions : JSON.parse(baseOptions)
+                parsedBaseOptions = typeof baseOptions === 'object' ? { ...baseOptions } : JSON.parse(baseOptions)
             } catch (exception) {
                 throw new Error("Invalid JSON in the ChatOpenAI's BaseOptions: " + exception)
             }
         }
 
         if (parsedBaseOptions?.stop) {
-            const stop = parsedBaseOptions.stop
+            const { stop, ...restBaseOptions } = parsedBaseOptions
+            parsedBaseOptions = Object.keys(restBaseOptions).length ? restBaseOptions : undefined
 
-            if (!obj.stop) {
+            if (!isReasoningModelOpenAI(modelName) && !obj.stop) {
                 obj.stop = Array.isArray(stop)
                     ? stop.map((item) => String(item).trim()).filter(Boolean)
                     : String(stop)
@@ -297,12 +298,6 @@ class ChatOpenAI_ChatModels implements INode {
                           .map((item) => item.trim())
                           .filter(Boolean)
             }
-
-            delete parsedBaseOptions.stop
-
-            if (Object.keys(parsedBaseOptions).length === 0) {
-                parsedBaseOptions = undefined
-            }
         }
 
         if (basePath || parsedBaseOptions) {