diff --git a/python_otbr_api/models.py b/python_otbr_api/models.py
index dcf0ee7..b1e9b93 100644
--- a/python_otbr_api/models.py
+++ b/python_otbr_api/models.py
@@ -7,6 +7,57 @@
 
 import voluptuous as vol  # type: ignore[import]
 
+# The OTBR REST API uses camelCase keys (per the OpenAPI spec in ot-br-posix),
+# but this library historically expected PascalCase. This mapping normalizes
+# camelCase keys to PascalCase so both formats are accepted.
+_CAMEL_TO_PASCAL: dict[str, str] = {
+    # Timestamp
+    "authoritative": "Authoritative",
+    "seconds": "Seconds",
+    "ticks": "Ticks",
+    # SecurityPolicy
+    "autonomousEnrollment": "AutonomousEnrollment",
+    "commercialCommissioning": "CommercialCommissioning",
+    "externalCommissioning": "ExternalCommissioning",
+    "nativeCommissioning": "NativeCommissioning",
+    "networkKeyProvisioning": "NetworkKeyProvisioning",
+    "nonCcmRouters": "NonCcmRouters",
+    "obtainNetworkKey": "ObtainNetworkKey",
+    "rotationTime": "RotationTime",
+    "routers": "Routers",
+    "tobleLink": "TobleLink",
+    # ActiveDataSet
+    "activeTimestamp": "ActiveTimestamp",
+    "channelMask": "ChannelMask",
+    "channel": "Channel",
+    "extPanId": "ExtPanId",
+    "meshLocalPrefix": "MeshLocalPrefix",
+    "networkKey": "NetworkKey",
+    "networkName": "NetworkName",
+    "panId": "PanId",
+    "pskc": "PSKc",
+    "securityPolicy": "SecurityPolicy",
+    # PendingDataSet
+    "activeDataset": "ActiveDataset",
+    "delay": "Delay",
+    "pendingTimestamp": "PendingTimestamp",
+}
+
+
+def _normalize_keys(data: Any) -> Any:
+    """Normalize camelCase JSON keys to PascalCase.
+
+    The OTBR REST API returns camelCase keys, but the schemas in this module
+    expect PascalCase. This function converts known camelCase keys so that both
+    formats are accepted. Unknown keys and non-dict values pass through unchanged.
+    """
+    if not isinstance(data, dict):
+        return data
+    return {
+        _CAMEL_TO_PASCAL.get(k, k): (_normalize_keys(v) if isinstance(v, dict) else v)
+        for k, v in data.items()
+    }
+
 
 @dataclass
 class Timestamp:
@@ -38,6 +89,7 @@ def as_json(self) -> dict:
     @classmethod
     def from_json(cls, json_data: Any) -> Timestamp:
         """Deserialize from JSON."""
+        json_data = _normalize_keys(json_data)
         cls.SCHEMA(json_data)
         return cls(
             json_data.get("Authoritative"),
@@ -104,6 +156,7 @@ def as_json(self) -> dict:
     @classmethod
     def from_json(cls, json_data: Any) -> SecurityPolicy:
         """Deserialize from JSON."""
+        json_data = _normalize_keys(json_data)
         cls.SCHEMA(json_data)
         return cls(
             json_data.get("AutonomousEnrollment"),
@@ -177,6 +230,7 @@ def as_json(self) -> dict:
     @classmethod
     def from_json(cls, json_data: Any) -> ActiveDataSet:
         """Deserialize from JSON."""
+        json_data = _normalize_keys(json_data)
         cls.SCHEMA(json_data)
         active_timestamp = None
         security_policy = None
@@ -229,6 +283,7 @@ def as_json(self) -> dict:
     @classmethod
     def from_json(cls, json_data: Any) -> PendingDataSet:
         """Deserialize from JSON."""
+        json_data = _normalize_keys(json_data)
         cls.SCHEMA(json_data)
         active_dataset = None
         pending_timestamp = None
diff --git a/tests/test_models.py b/tests/test_models.py
index c79610c..152056b 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -18,3 +18,51 @@ def test_deserialize_pending_dataset():
         12345,
         python_otbr_api.Timestamp(),
     )
+
+
+def test_deserialize_active_dataset_camelcase():
+    """Test deserializing with camelCase keys as returned by the OTBR REST API."""
+    dataset = python_otbr_api.ActiveDataSet.from_json(
+        {
+            "activeTimestamp": {"seconds": 1, "ticks": 0, "authoritative": False},
+            "networkKey": "00112233445566778899aabbccddeeff",
+            "networkName": "OpenThread-1234",
+            "extPanId": "dead00beef00cafe",
+            "meshLocalPrefix": "fd11:2222:3333::/64",
+            "panId": 12345,
+            "channel": 15,
+            "pskc": "aabbccddeeff00112233445566778899",
+            "securityPolicy": {
+                "rotationTime": 672,
+                "obtainNetworkKey": True,
+                "routers": True,
+            },
+            "channelMask": 134215680,
+        }
+    )
+    assert dataset.channel == 15
+    assert dataset.network_name == "OpenThread-1234"
+    assert dataset.extended_pan_id == "dead00beef00cafe"
+    assert dataset.pan_id == 12345
+    assert dataset.psk_c == "aabbccddeeff00112233445566778899"
+    assert dataset.active_timestamp == python_otbr_api.Timestamp(
+        authoritative=False, seconds=1, ticks=0
+    )
+    assert dataset.security_policy is not None
+    assert dataset.security_policy.rotation_time == 672
+
+
+def test_deserialize_pending_dataset_camelcase():
+    """Test that camelCase works for PendingDataSet with nested objects."""
+    result = python_otbr_api.PendingDataSet.from_json(
+        {
+            "activeDataset": {"networkName": "OpenThread HA"},
+            "delay": 12345,
+            "pendingTimestamp": {},
+        }
+    )
+    assert result == python_otbr_api.PendingDataSet(
+        python_otbr_api.ActiveDataSet(network_name="OpenThread HA"),
+        12345,
+        python_otbr_api.Timestamp(),
+    )