fix(Gemini Node): Allow Nano Banana model to be selected (#19080)

Co-authored-by: Jonathan Bennetts <jonathan.bennetts@gmail.com>

packages/@n8n/nodes-langchain/nodes/vendors/GoogleGemini/actions/image/generate.operation.ts

@@ -103,7 +103,7 @@ export async function execute(this: IExecuteFunctions, i: number): Promise<INode
 		});
 
 		return await Promise.all(promises);
-	} else if (model.includes('imagen')) {
+	} else if (model.includes('imagen') || model.includes('flash-image')) {
 		// Imagen models use a different endpoint and request/response structure
 		const sampleCount = this.getNodeParameter('options.sampleCount', i, 1) as number;
 		const body = {

packages/@n8n/nodes-langchain/nodes/vendors/GoogleGemini/methods/listSearch.test.ts

@@ -38,6 +38,9 @@ const mockResponse = {
 		{
 			name: 'models/gemini-2.5-flash-preview-native-audio-dialog',
 		},
+		{
+			name: 'models/gemini-2.5-flash-image',
+		},
 	],
 };
 
@@ -126,6 +129,11 @@ describe('GoogleGemini -> listSearch', () => {
 						name: 'models/imagen-3.0-generate-002',
 						value: 'models/imagen-3.0-generate-002',
 					},
+					{
+						// eslint-disable-next-line n8n-nodes-base/node-param-display-name-miscased
+						name: 'models/gemini-2.5-flash-image (Nano Banana)',
+						value: 'models/gemini-2.5-flash-image',
+					},
 				],
 			});
 		});

packages/@n8n/nodes-langchain/nodes/vendors/GoogleGemini/methods/listSearch.ts

@@ -64,11 +64,22 @@ export async function imageGenerationModelSearch(
 	this: ILoadOptionsFunctions,
 	filter?: string,
 ): Promise<INodeListSearchResult> {
-	return await baseModelSearch.call(
+	const results = await baseModelSearch.call(
 		this,
-		(model) => model.includes('imagen') || model.includes('image-generation'),
+		(model) =>
+			model.includes('imagen') ||
+			model.includes('image-generation') ||
+			model.includes('flash-image'),
 		filter,
 	);
+
+	return {
+		results: results.results.map((r) =>
+			r.name.includes('gemini-2.5-flash-image')
+				? { name: `${r.name} (Nano Banana)`, value: r.value }
+				: r,
+		),
+	};
 }
 
 export async function videoGenerationModelSearch(