diff --git a/src/lib/aiProviders.ts b/src/lib/aiProviders.ts
new file mode 100644
index 0000000..588e737
--- /dev/null
+++ b/src/lib/aiProviders.ts
@@ -0,0 +1,74 @@
+export type AIProvider = 'pollinations' | 'gpt-oss' | 'custom';
+
+export interface AIProviderConfig {
+  id: AIProvider;
+  name: string;
+  description: string;
+  endpoint: string;
+  requiresAuth: boolean;
+  apiKey?: string;
+  model?: string;
+  allowsCustomKey?: boolean;
+}
+
+const getGptOssApiKey = (): string | undefined => {
+  return import.meta.env?.VITE_GPT_OSS_API_KEY ||
+         process.env.VITE_GPT_OSS_API_KEY ||
+         process.env.NEXT_PUBLIC_GPT_OSS_API_KEY;
+};
+
+export const AI_PROVIDERS: AIProviderConfig[] = [
+  {
+    id: 'pollinations',
+    name: 'Pollinations.ai',
+    description: 'Free, no login required',
+    endpoint: 'https://text.pollinations.ai/openai',
+    requiresAuth: false,
+    model: 'openai',
+  },
+  {
+    id: 'gpt-oss',
+    name: 'GPT-OSS-20B',
+    description: 'Alternative model (requires API key)',
+    endpoint: 'https://api.pawan.krd/gpt-oss-20b/v1/chat/completions',
+    requiresAuth: true,
+    get apiKey() {
+      return getGptOssApiKey();
+    },
+    model: 'gpt-oss-20b',
+  },
+  {
+    id: 'custom',
+    name: 'Custom API',
+    description: 'Use your own OpenAI-compatible API',
+    endpoint: '',
+    requiresAuth: true,
+    allowsCustomKey: true,
+    model: '',
+  },
+];
+
+export const getProvider = (id: AIProvider): AIProviderConfig => {
+  const provider = AI_PROVIDERS.find(p => p.id === id) || AI_PROVIDERS[0];
+
+  if (id === 'custom') {
+    const stored = localStorage.getItem(CUSTOM_API_STORAGE_KEY);
+    if (stored) {
+      try {
+        const customConfig = JSON.parse(stored);
+        return {
+          ...provider,
+          endpoint: customConfig.endpoint || '',
+          apiKey: customConfig.apiKey || undefined,
+          model: customConfig.model || '',
+        };
+      } catch {
+        return provider;
+      }
+    }
+  }
+
+  return provider;
+};
+
+export const CUSTOM_API_STORAGE_KEY = 'ai-chat-custom-api';