diff --git a/packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.test.ts b/packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.test.ts
new file mode 100644
index 00000000000..7bb08290745
--- /dev/null
+++ b/packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.test.ts
@@ -0,0 +1,105 @@
+import { INodeData } from '../../../src/Interface'
+import { ChatOpenAI } from '../ChatOpenAI/FlowiseChatOpenAI'
+
+// Import the target node class for testing
+const { nodeClass } = require('./ChatLitellm')
+
+// Mock external utility functions
+jest.mock('../../../src/utils', () => ({
+    getBaseClasses: jest.fn().mockReturnValue(['BaseChatModel', 'ChatLitellm']),
+    getCredentialData: jest.fn().mockResolvedValue({}),
+    getCredentialParam: jest.fn().mockReturnValue('sk-test-api-key')
+}))
+
+// Mock FlowiseChatOpenAI class to prevent actual API calls and verify passed parameters
+jest.mock('../ChatOpenAI/FlowiseChatOpenAI', () => {
+    return {
+        ChatOpenAI: jest.fn().mockImplementation((id, obj) => {
+            return {
+                id,
+                obj, // Expose the injected parameters for testing
+                setMultiModalOption: jest.fn()
+            }
+        })
+    }
+})
+
+describe('ChatLitellm_ChatModels', () => {
+    let node: any
+
+    beforeEach(() => {
+        node = new nodeClass()
+        jest.clearAllMocks()
+    })
+
+    it('should initialize with correct properties and inputs', () => {
+        expect(node.label).toBe('LiteLLM')
+        expect(node.name).toBe('chatLitellm')
+        expect(node.type).toBe('ChatLitellm')
+        
+        // Verify that the newly added 'user' field exists in the inputs array
+        const userInput = node.inputs.find((input: any) => input.name === 'user')
+        expect(userInput).toBeDefined()
+        expect(userInput.type).toBe('string')
+        expect(userInput.additionalParams).toBe(true)
+    })
+
+    it('should initialize the model with basic required parameters', async () => {
+        const nodeData: INodeData = {
+            id: 'test-node-id',
+            inputs: {
+                modelName: 'vertex-gemini-2.5-flash',
+                temperature: '0.7'
+            }
+        } as any
+
+        const model = await node.init(nodeData, '', {})
+
+        expect(ChatOpenAI).toHaveBeenCalledTimes(1)
+        expect(model.id).toBe('test-node-id')
+        
+        // Check basic parameter mapping
+        expect(model.obj.modelName).toBe('vertex-gemini-2.5-flash')
+        expect(model.obj.temperature).toBe(0.7)
+        expect(model.obj.streaming).toBe(true) // Default fallback
+        expect(model.obj.openAIApiKey).toBe('sk-test-api-key')
+    })
+
+    it('should properly map advanced parameters including the new "user" parameter', async () => {
+        const nodeData: INodeData = {
+            id: 'test-node-id',
+            inputs: {
+                modelName: 'vertex-gemini-2.5-flash',
+                temperature: '0.5',
+                streaming: false,
+                maxTokens: '1024',
+                topP: '0.9',
+                timeout: '5000',
+                user: 'test01', // Added User ID
+                basePath: 'http://localhost:4000/v1',
+                allowImageUploads: true
+            }
+        } as any
+
+        const model = await node.init(nodeData, '', {})
+
+        expect(ChatOpenAI).toHaveBeenCalledTimes(1)
+        
+        // Check advanced parameter and user data mapping
+        expect(model.obj.user).toBe('test01')
+        expect(model.obj.maxTokens).toBe(1024)
+        expect(model.obj.topP).toBe(0.9)
+        expect(model.obj.timeout).toBe(5000)
+        expect(model.obj.streaming).toBe(false)
+        
+        // Check Base URL configuration
+        expect(model.obj.configuration?.baseURL).toBe('http://localhost:4000/v1')
+        
+        // Check multimodal option call
+        expect(model.setMultiModalOption).toHaveBeenCalledWith({
+            image: {
+                allowImageUploads: true
+            }
+        })
+    })
+})
diff --git a/packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.ts b/packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.ts
index a444d1ac79d..db05845bab6 100644
--- a/packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.ts
+++ b/packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.ts
@@ -100,6 +100,14 @@ class ChatLitellm_ChatModels implements INode {
                 step: 1,
                 optional: true,
                 additionalParams: true
+            },
+            {
+                label: 'User',
+                name: 'user',
+                type: 'string',
+                placeholder: 'user id',
+                optional: true,
+                additionalParams: true
             }
         ]
     }
@@ -114,6 +122,7 @@ class ChatLitellm_ChatModels implements INode {
         const topP = nodeData.inputs?.topP as string
         const timeout = nodeData.inputs?.timeout as string
         const allowImageUploads = nodeData.inputs?.allowImageUploads as boolean
+        const user = nodeData.inputs?.user as string
 
         const credentialData = await getCredentialData(nodeData.credential ?? '', options)
         const apiKey = getCredentialParam('litellmApiKey', credentialData, nodeData)
@@ -135,6 +144,7 @@ class ChatLitellm_ChatModels implements INode {
         if (topP) obj.topP = parseFloat(topP)
         if (timeout) obj.timeout = parseInt(timeout, 10)
         if (cache) obj.cache = cache
+        if (user) obj.user = user
         if (apiKey) {
             obj.openAIApiKey = apiKey
             obj.apiKey = apiKey