diff --git a/packages/components/nodes/chatmodels/ChatOpenAICustom/ChatOpenAICustom.test.ts b/packages/components/nodes/chatmodels/ChatOpenAICustom/ChatOpenAICustom.test.ts
new file mode 100644
index 00000000000..d0bf5275299
--- /dev/null
+++ b/packages/components/nodes/chatmodels/ChatOpenAICustom/ChatOpenAICustom.test.ts
@@ -0,0 +1,80 @@
+jest.mock('@langchain/openai', () => ({
+    ChatOpenAI: jest.fn().mockImplementation((fields) => ({ fields }))
+}))
+
+jest.mock('../../../src/utils', () => ({
+    getBaseClasses: jest.fn().mockReturnValue(['BaseChatModel']),
+    getCredentialData: jest.fn(),
+    getCredentialParam: jest.fn()
+}))
+
+import { getCredentialData, getCredentialParam } from '../../../src/utils'
+
+const { nodeClass: ChatOpenAICustom } = require('./ChatOpenAICustom')
+
+describe('ChatOpenAICustom', () => {
+    beforeEach(() => {
+        jest.clearAllMocks()
+        ;(getCredentialData as jest.Mock).mockResolvedValue({ openAIApiKey: 'test-api-key' })
+        ;(getCredentialParam as jest.Mock).mockImplementation((key, credentialData) => credentialData[key])
+    })
+
+    it('exposes stopSequence as an additional parameter', () => {
+        const node = new ChatOpenAICustom()
+
+        expect(node.inputs).toEqual(
+            expect.arrayContaining([
+                expect.objectContaining({
+                    label: 'Stop Sequence',
+                    name: 'stopSequence',
+                    additionalParams: true
+                })
+            ])
+        )
+    })
+
+    it('passes comma-separated stop sequences to ChatOpenAI', async () => {
+        const node = new ChatOpenAICustom()
+        const model = await node.init(
+            {
+                credential: 'cred-1',
+                inputs: {
+                    modelName: 'custom-model',
+                    temperature: '0.3',
+                    stopSequence: '<|im_end|>, END',
+                    streaming: false
+                }
+            },
+            '',
+            {}
+        )
+
+        expect(model.fields).toMatchObject({
+            modelName: 'custom-model',
+            openAIApiKey: 'test-api-key',
+            apiKey: 'test-api-key',
+            temperature: 0.3,
+            streaming: false,
+            stop: ['<|im_end|>', 'END']
+        })
+    })
+
+    it('ignores empty stop sequence entries', async () => {
+        const node = new ChatOpenAICustom()
+        const model = await node.init(
+            {
+                credential: 'cred-1',
+                inputs: {
+                    modelName: 'custom-model',
+                    temperature: '0.3',
+                    stopSequence: 'foo,, bar, ',
+                    streaming: false
+                }
+            },
+            '',
+            {}
+        )
+
+        expect(model.fields.stop).toEqual(['foo', 'bar'])
+    })
+})
diff --git a/packages/components/nodes/chatmodels/ChatOpenAICustom/ChatOpenAICustom.ts b/packages/components/nodes/chatmodels/ChatOpenAICustom/ChatOpenAICustom.ts
index faf2ebd8b37..21981bd9190 100644
--- a/packages/components/nodes/chatmodels/ChatOpenAICustom/ChatOpenAICustom.ts
+++ b/packages/components/nodes/chatmodels/ChatOpenAICustom/ChatOpenAICustom.ts
@@ -18,7 +18,7 @@ class ChatOpenAICustom_ChatModels implements INode {
     constructor() {
         this.label = 'OpenAI Custom Model'
         this.name = 'chatOpenAICustom'
-        this.version = 4.0
+        this.version = 4.1
         this.type = 'ChatOpenAI-Custom'
         this.icon = 'openai.svg'
         this.category = 'Chat Models'
@@ -92,6 +92,15 @@ class ChatOpenAICustom_ChatModels implements INode {
                 optional: true,
                 additionalParams: true
             },
+            {
+                label: 'Stop Sequence',
+                name: 'stopSequence',
+                type: 'string',
+                rows: 4,
+                optional: true,
+                description: 'List of stop words to use when generating. Use comma to separate multiple stop words.',
+                additionalParams: true
+            },
             {
                 label: 'Timeout',
                 name: 'timeout',
@@ -126,6 +135,7 @@ class ChatOpenAICustom_ChatModels implements INode {
         const topP = nodeData.inputs?.topP as string
         const frequencyPenalty = nodeData.inputs?.frequencyPenalty as string
         const presencePenalty = nodeData.inputs?.presencePenalty as string
+        const stopSequence = nodeData.inputs?.stopSequence as string
         const timeout = nodeData.inputs?.timeout as string
         const streaming = nodeData.inputs?.streaming as boolean
         const basePath = nodeData.inputs?.basepath as string
@@ -147,6 +157,13 @@ class ChatOpenAICustom_ChatModels implements INode {
         if (topP) obj.topP = parseFloat(topP)
         if (frequencyPenalty) obj.frequencyPenalty = parseFloat(frequencyPenalty)
         if (presencePenalty) obj.presencePenalty = parseFloat(presencePenalty)
+        if (stopSequence) {
+            const stopSequenceArray = stopSequence
+                .split(',')
+                .map((item) => item.trim())
+                .filter((item) => item !== '')
+            if (stopSequenceArray.length > 0) obj.stop = stopSequenceArray
+        }
         if (timeout) obj.timeout = parseInt(timeout, 10)
         if (cache) obj.cache = cache