diff --git a/examples/structured_output_model.py b/examples/structured_output_model.py
index 10328df..d847001 100644
--- a/examples/structured_output_model.py
+++ b/examples/structured_output_model.py
@@ -7,7 +7,7 @@
 
 from pydantic import BaseModel
 
-from droid_sdk import run
+from droid_sdk import RunSuccess, SessionConfig, run
 
 
 class Finding(BaseModel):
@@ -22,11 +22,29 @@ class Review(BaseModel):
 
 async def main() -> None:
     result = await run(
-        "Return a short repository summary and zero or more findings.",
+        (
+            'Return summary exactly "Structured output works." and one finding '
+            'with severity "low" and message exactly "Example complete."'
+        ),
         output=Review,
-        timeout=180,
+        timeout=60,
+        config=SessionConfig(
+            disable_builtin_skills=True,
+            restrict_tools=(),
+        ),
+    )
+    assert isinstance(result, RunSuccess), (
+        result.error.message if result.error else result.subtype
+    )
+    assert result.output == Review(
+        summary="Structured output works.",
+        findings=[
+            Finding(
+                severity="low",
+                message="Example complete.",
+            )
+        ],
     )
-    assert result.output is not None, result.output_validation_error
     print(result.output.summary)
 
 
diff --git a/src/droid_sdk/_high_level/output.py b/src/droid_sdk/_high_level/output.py
index fa5d883..abb3c84 100644
--- a/src/droid_sdk/_high_level/output.py
+++ b/src/droid_sdk/_high_level/output.py
@@ -47,11 +47,17 @@ def adapt(self, raw: object | None) -> OutputAdaptation[T_co]:
             return OutputAdaptation(None, None, None)
 
         if self._model is not None:
+            structured_output = _raw_object(raw)
+            validation_input = (
+                thaw_json(structured_output)
+                if structured_output is not None
+                else raw
+            )
             try:
-                value = self._model.model_validate(raw)
+                value = self._model.model_validate(validation_input)
             except ValidationError as exc:
-                return OutputAdaptation(None, _raw_object(raw), exc)
-            return OutputAdaptation(cast("T_co", value), _raw_object(raw), None)
+                return OutputAdaptation(None, structured_output, exc)
+            return OutputAdaptation(cast("T_co", value), structured_output, None)
 
         raw_value = _validate_json_object(raw)
         return OutputAdaptation(
diff --git a/tests/test_v5_streaming_core.py b/tests/test_v5_streaming_core.py
index 35cd57f..d3730a7 100644
--- a/tests/test_v5_streaming_core.py
+++ b/tests/test_v5_streaming_core.py
@@ -6,7 +6,7 @@
 from typing import Any, cast
 
 import pytest
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
 
 from droid_sdk import (
     AssistantMessage,
@@ -780,6 +780,20 @@ class NumericOutput(BaseModel):
     value: float
 
 
+class StrictFinding(BaseModel):
+    model_config = ConfigDict(strict=True, extra="forbid")
+
+    severity: str
+    message: str
+
+
+class StrictReview(BaseModel):
+    model_config = ConfigDict(strict=True, extra="forbid")
+
+    summary: str
+    findings: list[StrictFinding]
+
+
 @pytest.mark.asyncio
 async def test_structured_output_raw_adapted_fallback_and_validation_error() -> None:
     valid = RunStream[Review](
@@ -845,6 +859,50 @@ async def test_structured_output_raw_adapted_fallback_and_validation_error() ->
     assert raw.result.output == {"summary": "fallback"}
 
 
+@pytest.mark.asyncio
+async def test_strict_nested_output_validates_frozen_stream_data() -> None:
+    stream = RunStream[StrictReview](
+        expected_turn_id="turn",
+        session_id="session",
+        output_adapter=prepare_output_adapter(StrictReview),
+    )
+    raw = {
+        "summary": "ok",
+        "findings": [
+            {
+                "severity": "high",
+                "message": "Validate ordinary JSON containers",
+            }
+        ],
+    }
+    stream.feed_notification(
+        {
+            "type": "structured_output",
+            "messageId": "assistant",
+            "structuredOutput": raw,
+        }
+    )
+    stream.feed_notification(_complete())
+
+    await _collect(stream)
+
+    assert isinstance(stream.result, RunSuccess)
+    assert stream.result.output == StrictReview.model_validate(raw)
+    structured_output = stream.result.structured_output
+    assert structured_output is not None
+    assert structured_output == {
+        "summary": "ok",
+        "findings": (
+            {
+                "severity": "high",
+                "message": "Validate ordinary JSON containers",
+            },
+        ),
+    }
+    assert isinstance(structured_output["findings"], tuple)
+    assert stream.result.output_validation_error is None
+
+
 @pytest.mark.asyncio
 async def test_requested_output_that_never_arrives_is_a_failure() -> None:
     missing = RunStream[Mapping[str, object]](