diff --git a/horde_sdk/ai_horde_api/apimodels/alchemy/_async.py b/horde_sdk/ai_horde_api/apimodels/alchemy/_async.py
index dffaa25..a9a7c1f 100644
--- a/horde_sdk/ai_horde_api/apimodels/alchemy/_async.py
+++ b/horde_sdk/ai_horde_api/apimodels/alchemy/_async.py
@@ -68,7 +68,9 @@ class AlchemyAsyncRequestFormItem(BaseModel):
 
     @field_validator("name")
     def check_name(cls, v: KNOWN_ALCHEMY_TYPES | str) -> KNOWN_ALCHEMY_TYPES | str:
-        if isinstance(v, str) and v not in KNOWN_ALCHEMY_TYPES.__members__:
+        if (isinstance(v, str) and v not in KNOWN_ALCHEMY_TYPES.__members__) or (
+            not isinstance(v, KNOWN_ALCHEMY_TYPES)
+        ):
             logger.warning(f"Unknown alchemy form name {v}. Is your SDK out of date or did the API change?")
         return v
 
diff --git a/horde_sdk/ai_horde_api/apimodels/alchemy/_status.py b/horde_sdk/ai_horde_api/apimodels/alchemy/_status.py
index 0f44c6d..11e6a26 100644
--- a/horde_sdk/ai_horde_api/apimodels/alchemy/_status.py
+++ b/horde_sdk/ai_horde_api/apimodels/alchemy/_status.py
@@ -68,7 +68,9 @@ class AlchemyFormStatus(BaseModel):
 
     @field_validator("form", mode="before")
     def validate_form(cls, v: str | KNOWN_ALCHEMY_TYPES) -> KNOWN_ALCHEMY_TYPES | str:
-        if isinstance(v, str) and v not in KNOWN_ALCHEMY_TYPES.__members__:
+        if (isinstance(v, str) and v not in KNOWN_ALCHEMY_TYPES.__members__) or (
+            not isinstance(v, KNOWN_ALCHEMY_TYPES)
+        ):
             logger.warning(f"Unknown form type {v}. Is your SDK out of date or did the API change?")
         return v
 
diff --git a/horde_sdk/ai_horde_api/apimodels/base.py b/horde_sdk/ai_horde_api/apimodels/base.py
index 6aa13c1..e7cb89c 100644
--- a/horde_sdk/ai_horde_api/apimodels/base.py
+++ b/horde_sdk/ai_horde_api/apimodels/base.py
@@ -18,6 +18,7 @@
     METADATA_TYPE,
     METADATA_VALUE,
     POST_PROCESSOR_ORDER_TYPE,
+    _all_valid_post_processors_names_and_values,
 )
 from horde_sdk.ai_horde_api.endpoints import AI_HORDE_BASE_URL
 from horde_sdk.ai_horde_api.fields import JobID, WorkerID
@@ -182,8 +183,9 @@ def width_divisible_by_64(cls, value: int) -> int:
     @field_validator("sampler_name")
     def sampler_name_must_be_known(cls, v: str | KNOWN_SAMPLERS) -> str | KNOWN_SAMPLERS:
         """Ensure that the sampler name is in this list of supported samplers."""
-        if v not in KNOWN_SAMPLERS.__members__:
+        if (isinstance(v, str) and v not in KNOWN_SAMPLERS.__members__) or (not isinstance(v, KNOWN_SAMPLERS)):
             logger.warning(f"Unknown sampler name {v}. Is your SDK out of date or did the API change?")
+
         return v
 
     # @model_validator(mode="after")
@@ -208,11 +210,11 @@ def post_processors_must_be_known(
         v: list[str | KNOWN_UPSCALERS | KNOWN_FACEFIXERS | KNOWN_MISC_POST_PROCESSORS],
     ) -> list[str | KNOWN_UPSCALERS | KNOWN_FACEFIXERS | KNOWN_MISC_POST_PROCESSORS]:
         """Ensure that the post processors are in this list of supported post processors."""
+
+        _valid_types: list[type] = [str, KNOWN_UPSCALERS, KNOWN_FACEFIXERS, KNOWN_MISC_POST_PROCESSORS]
         for post_processor in v:
-            if (
-                post_processor not in KNOWN_UPSCALERS.__members__
-                and post_processor not in KNOWN_FACEFIXERS.__members__
-                and post_processor not in KNOWN_MISC_POST_PROCESSORS.__members__
+            if post_processor not in _all_valid_post_processors_names_and_values or (
+                type(post_processor) not in _valid_types
             ):
                 logger.warning(
                     f"Unknown post processor {post_processor}. Is your SDK out of date or did the API change?",
@@ -224,7 +226,7 @@ def control_type_must_be_known(cls, v: str | KNOWN_CONTROLNETS | None) -> str |
         """Ensure that the control type is in this list of supported control types."""
         if v is None:
             return None
-        if v not in KNOWN_CONTROLNETS.__members__:
+        if (isinstance(v, str) and v not in KNOWN_CONTROLNETS.__members__) or (not isinstance(v, KNOWN_CONTROLNETS)):
             logger.warning(f"Unknown control type '{v}'. Is your SDK out of date or did the API change?")
         return v
 
@@ -260,13 +262,13 @@ class GenMetadataEntry(BaseModel):
     @field_validator("type_")
     def validate_type(cls, v: str | METADATA_TYPE) -> str | METADATA_TYPE:
         """Ensure that the type is in this list of supported types."""
-        if v not in METADATA_TYPE.__members__:
+        if (isinstance(v, str) and v not in METADATA_TYPE.__members__) or (not isinstance(v, METADATA_TYPE)):
             logger.warning(f"Unknown metadata type {v}. Is your SDK out of date or did the API change?")
         return v
 
     @field_validator("value")
     def validate_value(cls, v: str | METADATA_VALUE) -> str | METADATA_VALUE:
         """Ensure that the value is in this list of supported values."""
-        if v not in METADATA_VALUE.__members__:
+        if (isinstance(v, str) and v not in METADATA_VALUE.__members__) or (not isinstance(v, METADATA_VALUE)):
             logger.warning(f"Unknown metadata value {v}. Is your SDK out of date or did the API change?")
         return v
diff --git a/horde_sdk/ai_horde_api/consts.py b/horde_sdk/ai_horde_api/consts.py
index 48cd25b..c425e4f 100644
--- a/horde_sdk/ai_horde_api/consts.py
+++ b/horde_sdk/ai_horde_api/consts.py
@@ -135,6 +135,18 @@ class KNOWN_MISC_POST_PROCESSORS(StrEnum):
     strip_background = auto()
 
 
+_all_valid_post_processors_names_and_values = (
+    list(KNOWN_UPSCALERS.__members__.keys())
+    + list(KNOWN_UPSCALERS.__members__.values())
+    + list(KNOWN_FACEFIXERS.__members__.keys())
+    + list(KNOWN_FACEFIXERS.__members__.values())
+    + list(KNOWN_MISC_POST_PROCESSORS.__members__.keys())
+    + list(KNOWN_MISC_POST_PROCESSORS.__members__.values())
+)
+"""Used to validate post processor names and values. \
+    This is because some post processor names are not valid python variable names."""
+
+
 class POST_PROCESSOR_ORDER_TYPE(StrEnum):
     """The post processor order types that are known to the API.
 
diff --git a/tests/ai_horde_api/test_ai_horde_api_models.py b/tests/ai_horde_api/test_ai_horde_api_models.py
index 8e113d3..d7a0c49 100644
--- a/tests/ai_horde_api/test_ai_horde_api_models.py
+++ b/tests/ai_horde_api/test_ai_horde_api_models.py
@@ -374,3 +374,22 @@ def test_ImageGenerateJobPopResponse() -> None:
         ),
         skipped=ImageGenerateJobPopSkippedStatus(),
     )
+    test_response = ImageGenerateJobPopResponse(
+        id=None,
+        ids=[JobID(root=UUID("00000000-0000-0000-0000-000000000000"))],
+        payload=ImageGenerateJobPopPayload(
+            post_processing=["4x_AnimeSharp"],
+            prompt="A cat in a hat",
+        ),
+        skipped=ImageGenerateJobPopSkippedStatus(),
+    )
+
+    test_response = ImageGenerateJobPopResponse(
+        id=None,
+        ids=[JobID(root=UUID("00000000-0000-0000-0000-000000000000"))],
+        payload=ImageGenerateJobPopPayload(
+            post_processing=[KNOWN_UPSCALERS.four_4x_AnimeSharp],
+            prompt="A cat in a hat",
+        ),
+        skipped=ImageGenerateJobPopSkippedStatus(),
+    )