From 75766bda5efd5438fed9046623fe24491dae5648 Mon Sep 17 00:00:00 2001
From: zhangjiarui <zhangjiarui@uniontech.com>
Date: Tue, 9 Jun 2026 09:32:04 +0800
Subject: [PATCH] fix: handle bare dict annotations in construct_type

Avoid unpacking missing type arguments when model construction sees an unparameterized dict field.

Fixes #3341
---
 src/openai/_models.py |  5 ++++-
 tests/test_models.py  | 12 ++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/openai/_models.py b/src/openai/_models.py
index ed4c1f82d6..a63e687025 100644
--- a/src/openai/_models.py
+++ b/src/openai/_models.py
@@ -657,7 +657,10 @@ def construct_type(*, value: object, type_: object, metadata: Optional[List[Any]
         if not is_mapping(value):
             return value
 
-        _, items_type = get_args(type_)  # Dict[_, items_type]
+        if len(args) < 2:
+            return value
+
+        _, items_type = args  # Dict[_, items_type]
         return {key: construct_type(value=item, type_=items_type) for key, item in value.items()}
 
     if (
diff --git a/tests/test_models.py b/tests/test_models.py
index cc204bac1d..a73bb3e0a5 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -133,6 +133,18 @@ class NestedModel(BaseModel):
     assert cast(Any, m.nested) is False
 
 
+def test_bare_dictionary() -> None:
+    class NestedModel(BaseModel):
+        nested: dict
+
+    m = NestedModel.construct(nested={"hello": {"world": True}})
+    assert m.nested == {"hello": {"world": True}}
+
+    # mismatched types
+    m = NestedModel.construct(nested=False)
+    assert cast(Any, m.nested) is False
+
+
 def test_nested_dictionary_model() -> None:
     class NestedModel(BaseModel):
         nested: Dict[str, BasicModel]