Se usan modelos de openai a partir de variables de entorno

supabase/functions/ai-generate-plan/index.ts

@@ -118,6 +118,10 @@ Deno.serve(async (req: Request): Promise<Response> => {
       SERVICE_ROLE_KEY,
     );
 
+    // Model name controlled via env var (single use)
+    const AI_GENERATE_PLAN_MODELO = Deno.env.get("AI_GENERATE_PLAN_MODELO") ??
+      "gpt-5-nano";
+
     const formData = await req.formData();
     const validation = parseAndValidate(formData);
     if (!validation.success) {
@@ -185,7 +189,7 @@ Deno.serve(async (req: Request): Promise<Response> => {
         : {};
 
     const aiStructuredPayload: StructuredResponseOptions = {
-      model: "gpt-5-nano",
+      model: AI_GENERATE_PLAN_MODELO,
       input: [
         { role: "system", content: systemPrompt },
         { role: "user", content: userPrompt },