defaults to o3, will add better fallback for this in the future

Author: dzhng

src/ai/providers.ts

@@ -13,7 +13,7 @@ const openai = createOpenAI({
   baseURL: process.env.OPENAI_ENDPOINT || 'https://api.openai.com/v1',
 } as CustomOpenAIProviderSettings);
 
-const customModel = process.env.OPENAI_MODEL || 'gpt-4o-mini';
+const customModel = process.env.OPENAI_MODEL || 'o3-mini';
 
 // Models