feat(chat): add dynamic provider catalog and zen support

backend/server/chat/llm_client.py

@@ -7,15 +7,61 @@ from integrations.models import UserAPIKey
 
 logger = logging.getLogger(__name__)
 
-PROVIDER_MODELS = {
+CHAT_PROVIDER_CONFIG = {
-    "openai": "gpt-4o",
+    "openai": {
-    "anthropic": "anthropic/claude-sonnet-4-20250514",
+        "label": "OpenAI",
-    "gemini": "gemini/gemini-2.0-flash",
+        "needs_api_key": True,
-    "ollama": "ollama/llama3.1",
+        "default_model": "gpt-4o",
-    "groq": "groq/llama-3.3-70b-versatile",
+        "api_base": None,
-    "mistral": "mistral/mistral-large-latest",
+    },
-    "github_models": "github/gpt-4o",
+    "anthropic": {
-    "openrouter": "openrouter/auto",
+        "label": "Anthropic",
+        "needs_api_key": True,
+        "default_model": "anthropic/claude-sonnet-4-20250514",
+        "api_base": None,
+    },
+    "gemini": {
+        "label": "Google Gemini",
+        "needs_api_key": True,
+        "default_model": "gemini/gemini-2.0-flash",
+        "api_base": None,
+    },
+    "ollama": {
+        "label": "Ollama",
+        "needs_api_key": True,
+        "default_model": "ollama/llama3.1",
+        "api_base": None,
+    },
+    "groq": {
+        "label": "Groq",
+        "needs_api_key": True,
+        "default_model": "groq/llama-3.3-70b-versatile",
+        "api_base": None,
+    },
+    "mistral": {
+        "label": "Mistral",
+        "needs_api_key": True,
+        "default_model": "mistral/mistral-large-latest",
+        "api_base": None,
+    },
+    "github_models": {
+        "label": "GitHub Models",
+        "needs_api_key": True,
+        "default_model": "github/gpt-4o",
+        "api_base": None,
+    },
+    "openrouter": {
+        "label": "OpenRouter",
+        "needs_api_key": True,
+        "default_model": "openrouter/auto",
+        "api_base": None,
+    },
+    "opencode_zen": {
+        "label": "OpenCode Zen",
+        "needs_api_key": True,
+        "default_model": "openai/gpt-4o-mini",
+        "api_base": "https://opencode.ai/zen/v1",
+    },
 }
 
 
@@ -27,9 +73,82 @@ def _safe_get(obj, key, default=None):
     return getattr(obj, key, default)
 
 
+def _normalize_provider_id(provider_id):
+    value = str(provider_id or "").strip()
+    if value.startswith("LlmProviders."):
+        value = value.split(".", 1)[1]
+    return value.lower()
+
+
+def _default_provider_label(provider_id):
+    return provider_id.replace("_", " ").title()
+
+
+def is_chat_provider_available(provider_id):
+    normalized_provider = _normalize_provider_id(provider_id)
+    return normalized_provider in CHAT_PROVIDER_CONFIG
+
+
+def get_provider_catalog():
+    seen = set()
+    catalog = []
+
+    for provider_id in getattr(litellm, "provider_list", []):
+        normalized_provider = _normalize_provider_id(provider_id)
+        if not normalized_provider or normalized_provider in seen:
+            continue
+
+        seen.add(normalized_provider)
+        provider_config = CHAT_PROVIDER_CONFIG.get(normalized_provider)
+        if provider_config:
+            catalog.append(
+                {
+                    "id": normalized_provider,
+                    "label": provider_config["label"],
+                    "available_for_chat": True,
+                    "needs_api_key": provider_config["needs_api_key"],
+                    "default_model": provider_config["default_model"],
+                    "api_base": provider_config["api_base"],
+                }
+            )
+            continue
+
+        catalog.append(
+            {
+                "id": normalized_provider,
+                "label": _default_provider_label(normalized_provider),
+                "available_for_chat": False,
+                "needs_api_key": None,
+                "default_model": None,
+                "api_base": None,
+            }
+        )
+
+    # Include app-supported OpenAI-compatible aliases that are not part of
+    # LiteLLM's native provider list (for example OpenCode Zen).
+    for provider_id, provider_config in CHAT_PROVIDER_CONFIG.items():
+        normalized_provider = _normalize_provider_id(provider_id)
+        if not normalized_provider or normalized_provider in seen:
+            continue
+
+        seen.add(normalized_provider)
+        catalog.append(
+            {
+                "id": normalized_provider,
+                "label": provider_config["label"],
+                "available_for_chat": True,
+                "needs_api_key": provider_config["needs_api_key"],
+                "default_model": provider_config["default_model"],
+                "api_base": provider_config["api_base"],
+            }
+        )
+
+    return catalog
+
+
 def get_llm_api_key(user, provider):
     """Get the user's API key for the given provider."""
-    normalized_provider = (provider or "").strip().lower()
+    normalized_provider = _normalize_provider_id(provider)
     try:
         key_obj = UserAPIKey.objects.get(user=user, provider=normalized_provider)
         return key_obj.get_api_key()
@@ -85,26 +204,36 @@ async def stream_chat_completion(user, messages, provider, tools=None):
 
     Yields SSE-formatted strings.
     """
-    normalized_provider = (provider or "").strip().lower()
+    normalized_provider = _normalize_provider_id(provider)
+    provider_config = CHAT_PROVIDER_CONFIG.get(normalized_provider)
+    if not provider_config:
+        payload = {
+            "error": f"Provider is not available for chat: {normalized_provider}."
+        }
+        yield f"data: {json.dumps(payload)}\n\n"
+        return
+
     api_key = get_llm_api_key(user, normalized_provider)
-    if not api_key:
+    if provider_config["needs_api_key"] and not api_key:
         payload = {
             "error": f"No API key found for provider: {normalized_provider}. Please add one in Settings."
         }
         yield f"data: {json.dumps(payload)}\n\n"
         return
 
-    model = PROVIDER_MODELS.get(normalized_provider, "gpt-4o")
+    completion_kwargs = {
+        "model": provider_config["default_model"],
+        "messages": messages,
+        "tools": tools,
+        "tool_choice": "auto" if tools else None,
+        "stream": True,
+        "api_key": api_key,
+    }
+    if provider_config["api_base"]:
+        completion_kwargs["api_base"] = provider_config["api_base"]
 
     try:
-        response = await litellm.acompletion(
+        response = await litellm.acompletion(**completion_kwargs)
-            model=model,
-            messages=messages,
-            tools=tools,
-            tool_choice="auto" if tools else None,
-            stream=True,
-            api_key=api_key,
-        )
 
         async for chunk in response:
             choices = _safe_get(chunk, "choices", []) or []

backend/server/chat/urls.py

@@ -1,10 +1,13 @@
 from django.urls import include, path
 from rest_framework.routers import DefaultRouter
 
-from .views import ChatViewSet
+from .views import ChatProviderCatalogViewSet, ChatViewSet
 
 router = DefaultRouter()
 router.register(r"conversations", ChatViewSet, basename="chat-conversation")
+router.register(
+    r"providers", ChatProviderCatalogViewSet, basename="chat-provider-catalog"
+)
 
 urlpatterns = [
     path("", include(router.urls)),

backend/server/chat/views.py

@@ -9,7 +9,12 @@ from rest_framework.permissions import IsAuthenticated
 from rest_framework.response import Response
 
 from .agent_tools import AGENT_TOOLS, execute_tool, serialize_tool_result
-from .llm_client import get_system_prompt, stream_chat_completion
+from .llm_client import (
+    get_provider_catalog,
+    get_system_prompt,
+    is_chat_provider_available,
+    stream_chat_completion,
+)
 from .models import ChatConversation, ChatMessage
 from .serializers import ChatConversationSerializer
 
@@ -106,6 +111,11 @@ class ChatViewSet(viewsets.ModelViewSet):
             )
 
         provider = (request.data.get("provider") or "openai").strip().lower()
+        if not is_chat_provider_available(provider):
+            return Response(
+                {"error": f"Provider is not available for chat: {provider}."},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
 
         ChatMessage.objects.create(
             conversation=conversation,
@@ -262,3 +272,10 @@ class ChatViewSet(viewsets.ModelViewSet):
         response["Cache-Control"] = "no-cache"
         response["X-Accel-Buffering"] = "no"
         return response
+
+
+class ChatProviderCatalogViewSet(viewsets.ViewSet):
+    permission_classes = [IsAuthenticated]
+
+    def list(self, request):
+        return Response(get_provider_catalog())

frontend/src/lib/types.ts

@@ -566,6 +566,15 @@ export type RecommendationResponse = {
 	};
 };
 
+export type ChatProviderCatalogEntry = {
+	id: string;
+	label: string;
+	available_for_chat: boolean;
+	needs_api_key: boolean | null;
+	default_model: string | null;
+	api_base: string | null;
+};
+
 export type CollectionItineraryDay = {
 	id: string;
 	collection: string; // UUID of the collection

frontend/src/routes/chat/+page.svelte

@@ -2,11 +2,7 @@
 	import { onMount } from 'svelte';
 	import { t } from 'svelte-i18n';
 	import { mdiRobot, mdiSend, mdiPlus, mdiDelete, mdiMenu, mdiClose } from '@mdi/js';
-
+	import type { ChatProviderCatalogEntry } from '$lib/types.js';
-	type Provider = {
-		value: string;
-		label: string;
-	};
 
 	type Conversation = {
 		id: string;
@@ -29,18 +25,30 @@
 	let streamingContent = '';
 
 	let selectedProvider = 'openai';
-	const providers: Provider[] = [
+	let providerCatalog: ChatProviderCatalogEntry[] = [];
-		{ value: 'openai', label: 'OpenAI' },
+	$: chatProviders = providerCatalog.filter((provider) => provider.available_for_chat);
-		{ value: 'anthropic', label: 'Anthropic' },
-		{ value: 'gemini', label: 'Google Gemini' },
-		{ value: 'ollama', label: 'Ollama' },
-		{ value: 'groq', label: 'Groq' },
-		{ value: 'mistral', label: 'Mistral' },
-		{ value: 'github_models', label: 'GitHub Models' },
-		{ value: 'openrouter', label: 'OpenRouter' }
-	];
 
-	onMount(loadConversations);
+	onMount(async () => {
+		await Promise.all([loadConversations(), loadProviderCatalog()]);
+	});
+
+	async function loadProviderCatalog() {
+		const res = await fetch('/api/chat/providers/');
+		if (!res.ok) {
+			return;
+		}
+
+		const catalog = (await res.json()) as ChatProviderCatalogEntry[];
+		providerCatalog = catalog;
+		const availableProviders = catalog.filter((provider) => provider.available_for_chat);
+		if (!availableProviders.length) {
+			return;
+		}
+
+		if (!availableProviders.some((provider) => provider.id === selectedProvider)) {
+			selectedProvider = availableProviders[0].id;
+		}
+	}
 
 	async function loadConversations() {
 		const res = await fetch('/api/chat/conversations/');
@@ -86,6 +94,7 @@
 
 	async function sendMessage() {
 		if (!inputMessage.trim() || isStreaming) return;
+		if (!chatProviders.some((provider) => provider.id === selectedProvider)) return;
 
 		let conversation = activeConversation;
 		if (!conversation) {
@@ -258,9 +267,13 @@
 			</svg>
 			<h1 class="text-lg font-semibold">{$t('chat.title')}</h1>
 			<div class="ml-auto">
-				<select class="select select-bordered select-sm" bind:value={selectedProvider}>
+				<select
-					{#each providers as provider}
+					class="select select-bordered select-sm"
-						<option value={provider.value}>{provider.label}</option>
+					bind:value={selectedProvider}
+					disabled={chatProviders.length === 0}
+				>
+					{#each chatProviders as provider}
+						<option value={provider.id}>{provider.label}</option>
 					{/each}
 				</select>
 			</div>
@@ -325,7 +338,7 @@
 				<button
 					class="btn btn-primary"
 					on:click={sendMessage}
-					disabled={isStreaming || !inputMessage.trim()}
+					disabled={isStreaming || !inputMessage.trim() || chatProviders.length === 0}
 					title={$t('chat.send')}
 				>
 					{#if isStreaming}

frontend/src/routes/settings/+page.svelte

@@ -3,7 +3,7 @@
 	import { page } from '$app/stores';
 	import { addToast } from '$lib/toasts';
 	import { CURRENCY_LABELS, CURRENCY_OPTIONS } from '$lib/money';
-	import type { ImmichIntegration, User } from '$lib/types.js';
+	import type { ChatProviderCatalogEntry, ImmichIntegration, User } from '$lib/types.js';
 	import type { PageData } from './$types';
 	import { onMount } from 'svelte';
 	import { browser } from '$app/environment';
@@ -46,6 +46,7 @@
 	let userApiKeys: UserAPIKey[] = data.props.apiKeys ?? [];
 	let apiKeysConfigError: string | null = data.props.apiKeysConfigError ?? null;
 	let newApiKeyProvider = 'anthropic';
+	let providerCatalog: ChatProviderCatalogEntry[] = [];
 	let newApiKeyValue = '';
 	let isSavingApiKey = false;
 	let deletingApiKeyId: string | null = null;
@@ -53,21 +54,26 @@
 	let isLoadingMcpToken = false;
 	let activeSection: string = 'profile';
 
-	const API_KEY_PROVIDER_OPTIONS = [
+	async function loadProviderCatalog() {
-		{ value: 'anthropic', labelKey: 'settings.api_key_provider_anthropic' },
+		const res = await fetch('/api/chat/providers/');
-		{ value: 'openai', labelKey: 'settings.api_key_provider_openai' },
+		if (!res.ok) {
-		{ value: 'gemini', labelKey: 'settings.api_key_provider_gemini' },
+			return;
-		{ value: 'ollama', labelKey: 'settings.api_key_provider_ollama' },
+		}
-		{ value: 'groq', labelKey: 'settings.api_key_provider_groq' },
+
-		{ value: 'mistral', labelKey: 'settings.api_key_provider_mistral' },
+		providerCatalog = await res.json();
-		{ value: 'github_models', labelKey: 'settings.api_key_provider_github_models' },
+		if (!providerCatalog.length) {
-		{ value: 'openrouter', labelKey: 'settings.api_key_provider_openrouter' }
+			return;
-	];
+		}
+
+		if (!providerCatalog.some((provider) => provider.id === newApiKeyProvider)) {
+			newApiKeyProvider = providerCatalog[0].id;
+		}
+	}
 
 	function getApiKeyProviderLabel(provider: string): string {
-		const option = API_KEY_PROVIDER_OPTIONS.find((entry) => entry.value === provider);
+		const catalogProvider = providerCatalog.find((entry) => entry.id === provider);
-		if (option) {
+		if (catalogProvider) {
-			return $t(option.labelKey);
+			return catalogProvider.label;
 		}
 
 		if (provider === 'google_maps') {
@@ -127,6 +133,8 @@
 	];
 
 	onMount(async () => {
+		void loadProviderCatalog();
+
 		if (browser) {
 			const queryParams = new URLSearchParams($page.url.search);
 			const pageParam = queryParams.get('page');
@@ -1642,9 +1650,10 @@
 										id="api-key-provider"
 										class="select select-bordered select-primary w-full"
 										bind:value={newApiKeyProvider}
+										disabled={providerCatalog.length === 0}
 									>
-											{#each API_KEY_PROVIDER_OPTIONS as option}
+										{#each providerCatalog as provider}
-												<option value={option.value}>{$t(option.labelKey)}</option>
+											<option value={provider.id}>{provider.label}</option>
 										{/each}
 									</select>
 								</div>
@@ -1665,7 +1674,11 @@
 											{$t('settings.api_key_write_only_hint')}
 										</p>
 									</div>
-									<button class="btn btn-primary" type="submit" disabled={isSavingApiKey}>
+									<button
+										class="btn btn-primary"
+										type="submit"
+										disabled={isSavingApiKey || providerCatalog.length === 0}
+									>
 										{#if isSavingApiKey}
 											<span class="loading loading-spinner loading-sm"></span>
 										{/if}