diff --git a/model_prices_and_context_window.json b/model_prices_and_context_window.json
index e31e6b3f4..e620c3fad 100644
--- a/model_prices_and_context_window.json
+++ b/model_prices_and_context_window.json
@@ -2085,7 +2085,8 @@
         "litellm_provider": "vertex_ai-anthropic_models",
         "mode": "chat",
         "supports_function_calling": true,
-        "supports_vision": true
+        "supports_vision": true,
+        "supports_assistant_prefill": true
     },
     "vertex_ai/claude-3-haiku@20240307": {
         "max_tokens": 4096,