diff --git a/packages/@n8n/nodes-langchain/nodes/llms/LMChatOpenAi/LmChatOpenAi.node.ts b/packages/@n8n/nodes-langchain/nodes/llms/LMChatOpenAi/LmChatOpenAi.node.ts
index 5cf188e752..eaaf4b6315 100644
--- a/packages/@n8n/nodes-langchain/nodes/llms/LMChatOpenAi/LmChatOpenAi.node.ts
+++ b/packages/@n8n/nodes-langchain/nodes/llms/LMChatOpenAi/LmChatOpenAi.node.ts
@@ -90,7 +90,11 @@ export class LmChatOpenAi implements INodeType {
 									{
 										type: 'filter',
 										properties: {
-											pass: "={{ $responseItem.id.startsWith('gpt-') && !$responseItem.id.includes('instruct') }}",
+											// If the baseURL is not set or is set to api.openai.com, include only chat models
+											pass: `={{
+												($parameter.options?.baseURL && !$parameter.options?.baseURL?.includes('api.openai.com')) ||
+												($responseItem.id.startsWith('gpt-') && !$responseItem.id.includes('instruct'))
+											}}`,
 										},
 									},
 									{
@@ -119,6 +123,18 @@ export class LmChatOpenAi implements INodeType {
 				},
 				default: 'gpt-3.5-turbo',
 			},
+			{
+				displayName:
+					'When using non-OpenAI models via "Base URL" override, not all models might be chat-compatible or support other features, like tools calling or JSON response format',
+				name: 'notice',
+				type: 'notice',
+				default: '',
+				displayOptions: {
+					show: {
+						'/options.baseURL': [{ _cnd: { exists: true } }],
+					},
+				},
+			},
 			{
 				displayName: 'Options',
 				name: 'options',
diff --git a/packages/@n8n/nodes-langchain/nodes/llms/LMOpenAi/LmOpenAi.node.ts b/packages/@n8n/nodes-langchain/nodes/llms/LMOpenAi/LmOpenAi.node.ts
index 3f2d1c4315..5408fc4da9 100644
--- a/packages/@n8n/nodes-langchain/nodes/llms/LMOpenAi/LmOpenAi.node.ts
+++ b/packages/@n8n/nodes-langchain/nodes/llms/LMOpenAi/LmOpenAi.node.ts
@@ -97,6 +97,18 @@ export class LmOpenAi implements INodeType {
 					},
 				},
 			},
+			{
+				displayName:
+					'When using non OpenAI models via Base URL override, not all models might be chat-compatible or support other features, like tools calling or JSON response format.',
+				name: 'notice',
+				type: 'notice',
+				default: '',
+				displayOptions: {
+					show: {
+						'/options.baseURL': [{ _cnd: { exists: true } }],
+					},
+				},
+			},
 			{
 				displayName: 'Options',
 				name: 'options',
@@ -198,7 +210,7 @@ export class LmOpenAi implements INodeType {
 				})) as { data: Array<{ owned_by: string; id: string }> };
 
 				for (const model of data) {
-					if (!model.owned_by?.startsWith('system')) continue;
+					if (!options.baseURL && !model.owned_by?.startsWith('system')) continue;
 					results.push({
 						name: model.id,
 						value: model.id,
diff --git a/packages/workflow/src/Interfaces.ts b/packages/workflow/src/Interfaces.ts
index 3a3aab1165..3433e0c45f 100644
--- a/packages/workflow/src/Interfaces.ts
+++ b/packages/workflow/src/Interfaces.ts
@@ -1296,7 +1296,8 @@ export type DisplayCondition =
 	| { _cnd: { startsWith: string } }
 	| { _cnd: { endsWith: string } }
 	| { _cnd: { includes: string } }
-	| { _cnd: { regex: string } };
+	| { _cnd: { regex: string } }
+	| { _cnd: { exists: true } };
 
 export interface IDisplayOptions {
 	hide?: {
diff --git a/packages/workflow/src/NodeHelpers.ts b/packages/workflow/src/NodeHelpers.ts
index b60aa3b1c2..1f27bacee9 100644
--- a/packages/workflow/src/NodeHelpers.ts
+++ b/packages/workflow/src/NodeHelpers.ts
@@ -359,7 +359,7 @@ const declarativeNodeOptionParameters: INodeProperties = {
 export function isSubNodeType(
 	typeDescription: Pick<INodeTypeDescription, 'outputs'> | null,
 ): boolean {
-	if (!typeDescription || !typeDescription.outputs || typeof typeDescription.outputs === 'string') {
+	if (!typeDescription?.outputs || typeof typeDescription.outputs === 'string') {
 		return false;
 	}
 	const outputTypes = getConnectionTypes(typeDescription.outputs);
@@ -521,6 +521,9 @@ const checkConditions = (
 				if (key === 'regex') {
 					return new RegExp(targetValue as string).test(propertyValue as string);
 				}
+				if (key === 'exists') {
+					return propertyValue !== null && propertyValue !== undefined && propertyValue !== '';
+				}
 				return false;
 			});
 		}
diff --git a/packages/workflow/test/NodeHelpers.conditions.test.ts b/packages/workflow/test/NodeHelpers.conditions.test.ts
index 9e1bcec5f0..05355d4a2e 100644
--- a/packages/workflow/test/NodeHelpers.conditions.test.ts
+++ b/packages/workflow/test/NodeHelpers.conditions.test.ts
@@ -1887,6 +1887,274 @@ describe('NodeHelpers', () => {
 					},
 				},
 			},
+			{
+				description:
+					'simple values with displayOptions "show" using exists condition. No values set.',
+				input: {
+					nodePropertiesArray: [
+						{
+							name: 'field1',
+							displayName: 'Field 1',
+							type: 'string',
+							default: '',
+						},
+						{
+							name: 'field2',
+							displayName: 'Field 2',
+							displayOptions: {
+								show: {
+									field1: [{ _cnd: { exists: true } }],
+								},
+							},
+							type: 'string',
+							default: 'default field2',
+						},
+					],
+					nodeValues: {},
+				},
+				output: {
+					noneDisplayedFalse: {
+						defaultsFalse: {},
+						defaultsTrue: {
+							field1: '',
+						},
+					},
+					noneDisplayedTrue: {
+						defaultsFalse: {},
+						defaultsTrue: {
+							field1: '',
+							field2: 'default field2',
+						},
+					},
+				},
+			},
+			{
+				description:
+					'simple values with displayOptions "show" using exists condition. Field1 has a value.',
+				input: {
+					nodePropertiesArray: [
+						{
+							name: 'field1',
+							displayName: 'Field 1',
+							type: 'string',
+							default: '',
+						},
+						{
+							name: 'field2',
+							displayName: 'Field 2',
+							displayOptions: {
+								show: {
+									field1: [{ _cnd: { exists: true } }],
+								},
+							},
+							type: 'string',
+							default: 'default field2',
+						},
+					],
+					nodeValues: {
+						field1: 'some value',
+					},
+				},
+				output: {
+					noneDisplayedFalse: {
+						defaultsFalse: {
+							field1: 'some value',
+						},
+						defaultsTrue: {
+							field1: 'some value',
+							field2: 'default field2',
+						},
+					},
+					noneDisplayedTrue: {
+						defaultsFalse: {
+							field1: 'some value',
+						},
+						defaultsTrue: {
+							field1: 'some value',
+							field2: 'default field2',
+						},
+					},
+				},
+			},
+			{
+				description:
+					'complex type "fixedCollection" with "multipleValues: false" and with displayOptions "show" using exists condition.',
+				input: {
+					nodePropertiesArray: [
+						{
+							name: 'values',
+							displayName: 'Values',
+							type: 'fixedCollection',
+							default: {},
+							options: [
+								{
+									name: 'data',
+									displayName: 'Data',
+									values: [
+										{
+											name: 'field1',
+											displayName: 'Field 1',
+											type: 'string',
+											default: '',
+										},
+										{
+											name: 'field2',
+											displayName: 'Field 2',
+											type: 'string',
+											displayOptions: {
+												show: {
+													field1: [{ _cnd: { exists: true } }],
+												},
+											},
+											default: 'default field2',
+										},
+									],
+								},
+							],
+						},
+					],
+					nodeValues: {
+						values: {
+							data: {
+								field1: 'some value',
+							},
+						},
+					},
+				},
+				output: {
+					noneDisplayedFalse: {
+						defaultsFalse: {
+							values: {
+								data: {
+									field1: 'some value',
+								},
+							},
+						},
+						defaultsTrue: {
+							values: {
+								data: {
+									field1: 'some value',
+									field2: 'default field2',
+								},
+							},
+						},
+					},
+					noneDisplayedTrue: {
+						defaultsFalse: {
+							values: {
+								data: {
+									field1: 'some value',
+								},
+							},
+						},
+						defaultsTrue: {
+							values: {
+								data: {
+									field1: 'some value',
+									field2: 'default field2',
+								},
+							},
+						},
+					},
+				},
+			},
+			{
+				description:
+					'complex type "collection" with "multipleValues: true" and with displayOptions "show" using exists condition.',
+				input: {
+					nodePropertiesArray: [
+						{
+							name: 'values',
+							displayName: 'Values',
+							type: 'collection',
+							typeOptions: {
+								multipleValues: true,
+							},
+							default: {},
+							options: [
+								{
+									name: 'field1',
+									displayName: 'Field 1',
+									type: 'string',
+									default: '',
+								},
+								{
+									name: 'field2',
+									displayName: 'Field 2',
+									type: 'string',
+									displayOptions: {
+										show: {
+											field1: [{ _cnd: { exists: true } }],
+										},
+									},
+									default: 'default field2',
+								},
+							],
+						},
+					],
+					nodeValues: {
+						values: [
+							{
+								field1: 'value1',
+							},
+							{
+								field1: '',
+							},
+							{},
+						],
+					},
+				},
+				output: {
+					noneDisplayedFalse: {
+						defaultsFalse: {
+							values: [
+								{
+									field1: 'value1',
+								},
+								{
+									field1: '',
+								},
+								{},
+							],
+						},
+						defaultsTrue: {
+							values: [
+								{
+									field1: 'value1',
+								},
+								{
+									field1: '',
+								},
+								{},
+							],
+						},
+					},
+					noneDisplayedTrue: {
+						defaultsFalse: {
+							values: [
+								{
+									field1: 'value1',
+								},
+								{
+									field1: '',
+								},
+								{},
+							],
+						},
+						defaultsTrue: {
+							values: [
+								{
+									field1: 'value1',
+								},
+								{
+									field1: '',
+								},
+								{},
+							],
+						},
+					},
+				},
+			},
 		];
 
 		for (const testData of tests) {