feat(Anthropic Chat Model Node): Fetch models dynamically & support thinking (#13543)

packages/@n8n/nodes-langchain/nodes/llms/LMChatAnthropic/methods/searchModels.ts

@@ -0,0 +1,60 @@
+import type {
+	ILoadOptionsFunctions,
+	INodeListSearchItems,
+	INodeListSearchResult,
+} from 'n8n-workflow';
+
+export interface AnthropicModel {
+	id: string;
+	display_name: string;
+	type: string;
+	created_at: string;
+}
+
+export async function searchModels(
+	this: ILoadOptionsFunctions,
+	filter?: string,
+): Promise<INodeListSearchResult> {
+	const response = (await this.helpers.httpRequestWithAuthentication.call(this, 'anthropicApi', {
+		url: 'https://api.anthropic.com/v1/models',
+		headers: {
+			'anthropic-version': '2023-06-01',
+		},
+	})) as { data: AnthropicModel[] };
+
+	const models = response.data || [];
+	let results: INodeListSearchItems[] = [];
+
+	if (filter) {
+		for (const model of models) {
+			if (model.id.toLowerCase().includes(filter.toLowerCase())) {
+				results.push({
+					name: model.display_name,
+					value: model.id,
+				});
+			}
+		}
+	} else {
+		results = models.map((model) => ({
+			name: model.display_name,
+			value: model.id,
+		}));
+	}
+
+	// Sort models with more recent ones first (claude-3 before claude-2)
+	results = results.sort((a, b) => {
+		const modelA = models.find((m) => m.id === a.value);
+		const modelB = models.find((m) => m.id === b.value);
+
+		if (!modelA || !modelB) return 0;
+
+		// Sort by created_at date, most recent first
+		const dateA = new Date(modelA.created_at);
+		const dateB = new Date(modelB.created_at);
+		return dateB.getTime() - dateA.getTime();
+	});
+
+	return {
+		results,
+	};
+}