diff --git a/llm/models.py b/llm/models.py
index 4e00987bc..07bce27fa 100644
--- a/llm/models.py
+++ b/llm/models.py
@@ -519,7 +519,7 @@ def __init__(
         self.schema = schema
         self.tools = _wrap_tools(tools or [])
         self.tool_results = tool_results or []
-        self.options = options or {}
+        self.options = options or model.Options()
         self.hide_reasoning = hide_reasoning
         # Explicit messages= list, if the caller supplied one. Copied so
         # later mutation by the caller doesn't alter the Prompt.
diff --git a/tests/test_options_parameter.py b/tests/test_options_parameter.py
index deb00f544..8a0a89529 100644
--- a/tests/test_options_parameter.py
+++ b/tests/test_options_parameter.py
@@ -6,6 +6,29 @@
 
 import pytest
 
+import llm
+
+
+@pytest.mark.parametrize("kwargs", ({}, {"options": None}, {"options": {}}))
+def test_direct_prompt_default_options(mocked_openai_responses, kwargs):
+    model = llm.get_model("gpt-5.5")
+    prompt = llm.Prompt("hello", model, **kwargs)
+    response = llm.Response(prompt=prompt, model=model, stream=False, key="test-key")
+
+    assert response.text() == "Bob, Alice, Eve"
+    assert isinstance(prompt.options, model.Options)
+    assert prompt.options == model.Options()
+
+
+def test_direct_prompt_preserves_options(mocked_openai_responses):
+    model = llm.get_model("gpt-5.5")
+    options = model.Options(temperature=0.5)
+    prompt = llm.Prompt("hello", model, options=options)
+    response = llm.Response(prompt=prompt, model=model, stream=False, key="test-key")
+
+    assert response.text() == "Bob, Alice, Eve"
+    assert prompt.options is options
+
 
 def test_prompt_with_options_dict(mock_model):
     mock_model.enqueue(["ok"])