diff --git a/app/admin_web.py b/app/admin_web.py
index 6064bc1..dd8149f 100644
--- a/app/admin_web.py
+++ b/app/admin_web.py
@@ -35,12 +35,10 @@ from app.models import (
     Website,
 )
 from app.services.ai_generation import (
-    SUPPORTED_MODELS,
     create_generation_run,
     generate_questions_batch,
     get_ai_stats,
     save_ai_question,
-    validate_ai_model,
 )
 from app.services.irt_calibration import get_calibration_status
 from app.services.tryout_json_import import (
@@ -687,7 +685,7 @@ def _basis_item_workspace_body(
     error: str | None = None,
     success: str | None = None,
     target_level: str = "mudah",
-    ai_model: str = settings.OPENROUTER_MODEL_QWEN,
+    ai_model: str = settings.OPENROUTER_MODEL_LLAMA,
     generation_count: str = "1",
     operator_notes: str = "",
     include_note_for_admin: bool = True,
@@ -695,10 +693,6 @@ def _basis_item_workspace_body(
 ) -> str:
     error_html = f'<div class="error">{escape(error)}</div>' if error else ""
     success_html = f'<div class="success">{escape(success)}</div>' if success else ""
-    model_options = "".join(
-        f'<option value="{escape(model)}" {"selected" if model == ai_model else ""}>{escape(label)}</option>'
-        for model, label in SUPPORTED_MODELS.items()
-    )
     status_filter = filters.get("status", "")
     level_filter = filters.get("level", "")
     min_frequency_filter = filters.get("min_frequency", "")
@@ -805,7 +799,7 @@ def _basis_item_workspace_body(
           <option value="sulit" {"selected" if target_level == "sulit" else ""}>sulit</option>
         </select>
         <label for="ai_model">Model</label>
-        <select id="ai_model" name="ai_model">{model_options}</select>
+        <input id="ai_model" name="ai_model" type="text" value="{escape(settings.OPENROUTER_MODEL_LLAMA)}" readonly>
         <label for="generation_count">Generate Count</label>
         <input id="generation_count" name="generation_count" type="number" min="1" max="50" value="{escape(generation_count)}">
         <p class="muted">Recommended: 1-3 per run. Larger runs increase overlap and review burden.</p>
@@ -1926,7 +1920,7 @@ async def basis_item_generate_submit(
     request: Request,
     db: AsyncSession = Depends(get_db),
     target_level: str = Form(...),
-    ai_model: str = Form(...),
+    ai_model: str = Form(""),
     generation_count: int = Form(1),
     operator_notes: str = Form(""),
     include_note_for_admin: str | None = Form(None),
@@ -1941,6 +1935,8 @@ async def basis_item_generate_submit(
     if basis_item is None or basis_item.generated_by == "ai" or basis_item.level != "sedang":
         return RedirectResponse(url="/admin/basis-items", status_code=HTTP_303_SEE_OTHER)
 
+    # Llama-only policy for production quality consistency.
+    ai_model = settings.OPENROUTER_MODEL_LLAMA
     note_for_admin = include_note_for_admin == "on"
     note_in_prompt = include_note_in_prompt == "on"
 
@@ -1983,8 +1979,6 @@ async def basis_item_generate_submit(
 
     if target_level not in {"mudah", "sulit"}:
         return RedirectResponse(url=f"/admin/basis-items/{basis_item.id}", status_code=HTTP_303_SEE_OTHER)
-    if not validate_ai_model(ai_model):
-        return RedirectResponse(url=f"/admin/basis-items/{basis_item.id}", status_code=HTTP_303_SEE_OTHER)
     if generation_count < 1 or generation_count > 50:
         return RedirectResponse(url=f"/admin/basis-items/{basis_item.id}", status_code=HTTP_303_SEE_OTHER)
 
@@ -2153,7 +2147,7 @@ def _ai_form_body(
     generated_variants: list[Item] | None = None,
     basis_item_id: str = "",
     target_level: str = "mudah",
-    ai_model: str = settings.OPENROUTER_MODEL_QWEN,
+    ai_model: str = settings.OPENROUTER_MODEL_LLAMA,
     generation_count: str = "1",
     operator_notes: str = "",
     include_note_for_admin: bool = True,
@@ -2161,10 +2155,6 @@ def _ai_form_body(
 ) -> str:
     error_html = f'<div class="error">{escape(error)}</div>' if error else ""
     success_html = f'<div class="success">{escape(success)}</div>' if success else ""
-    options_html = "".join(
-        f'<option value="{escape(model)}" {"selected" if model == ai_model else ""}>{escape(label)}</option>'
-        for model, label in SUPPORTED_MODELS.items()
-    )
     basis_items = basis_items or []
     generation_runs = generation_runs or []
     generated_variants = generated_variants or []
@@ -2271,9 +2261,7 @@ def _ai_form_body(
         <option value="sulit" {"selected" if target_level == "sulit" else ""}>sulit</option>
       </select>
       <label for="ai_model">Model</label>
-      <select id="ai_model" name="ai_model" style="width:100%;box-sizing:border-box;border:1px solid #cbd5e1;border-radius:10px;padding:12px 14px;font-size:15px;">
-        {options_html}
-      </select>
+      <input id="ai_model" name="ai_model" type="text" value="{escape(settings.OPENROUTER_MODEL_LLAMA)}" readonly style="width:100%;box-sizing:border-box;border:1px solid #cbd5e1;border-radius:10px;padding:12px 14px;font-size:15px;background:#f8fafc;">
       <label for="generation_count">Generate Count</label>
       <input id="generation_count" name="generation_count" type="number" min="1" max="50" value="{escape(generation_count)}">
       <p class="muted">Recommended: 1-3 variants per run. Larger runs can increase overlap and review burden. Backend safety cap: 50.</p>
@@ -2353,7 +2341,7 @@ async def ai_playground_submit(
     db: AsyncSession = Depends(get_db),
     basis_item_id: int = Form(...),
     target_level: str = Form(...),
-    ai_model: str = Form(...),
+    ai_model: str = Form(""),
     generation_count: int = Form(1),
     operator_notes: str = Form(""),
     include_note_for_admin: str | None = Form(None),
@@ -2368,6 +2356,8 @@ async def ai_playground_submit(
     generation_runs = await _recent_generation_runs(db)
     generated_variants = await _recent_generated_variants(db)
 
+    # Llama-only policy for production quality consistency.
+    ai_model = settings.OPENROUTER_MODEL_LLAMA
     note_for_admin = include_note_for_admin == "on"
     note_in_prompt = include_note_in_prompt == "on"
 
@@ -2407,24 +2397,6 @@ async def ai_playground_submit(
         )
         return _render_admin_page(request, "AI Playground", "AI Playground", body)
 
-    if not validate_ai_model(ai_model):
-        body = _ai_form_body(
-            True,
-            stats,
-            error="Unsupported AI model.",
-            basis_items=basis_items,
-            generation_runs=generation_runs,
-            generated_variants=generated_variants,
-            basis_item_id=str(basis_item_id),
-            target_level=target_level,
-            ai_model=ai_model,
-            generation_count=str(generation_count),
-            operator_notes=operator_notes,
-            include_note_for_admin=note_for_admin,
-            include_note_in_prompt=note_in_prompt,
-        )
-        return _render_admin_page(request, "AI Playground", "AI Playground", body)
-
     result = await db.execute(select(Item).where(Item.id == basis_item_id))
     basis_item = result.scalar_one_or_none()
     if not basis_item: