diff --git a/simplemind/models.py b/simplemind/models.py
index 5846489..8617904 100644
--- a/simplemind/models.py
+++ b/simplemind/models.py
@@ -4,7 +4,8 @@ from typing import Any, Dict, List, Literal, Optional
 
 from pydantic import BaseModel, Field
 
-from simplemind.utils import find_provider
+from .utils import find_provider
+
 
 MESSAGE_ROLE = Literal["system", "user", "assistant"]
 
diff --git a/simplemind/providers/_base.py b/simplemind/providers/_base.py
index ff4df23..43715d3 100644
--- a/simplemind/providers/_base.py
+++ b/simplemind/providers/_base.py
@@ -2,13 +2,13 @@ from abc import ABC, abstractmethod
 
 from instructor import Instructor
 
-from simplemind.models import Conversation, Message
+# from ..models import Conversation, Message
 
 
 class BaseProvider(ABC):
     """The base provider class."""
 
-    __name__: str
+    NAME: str
     DEFAULT_MODEL: str
 
     @property
@@ -24,7 +24,7 @@ class BaseProvider(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def send_conversation(self, conversation: Conversation) -> Message:
+    def send_conversation(self, conversation: "Conversation") -> "Message":
         """Send a conversation to the provider."""
         raise NotImplementedError
 
diff --git a/simplemind/providers/anthropic.py b/simplemind/providers/anthropic.py
index 4efa976..b164c83 100644
--- a/simplemind/providers/anthropic.py
+++ b/simplemind/providers/anthropic.py
@@ -3,9 +3,8 @@ from typing import Union
 import anthropic
 import instructor
 
-from simplemind.models import Conversation, Message
-from simplemind.providers._base import BaseProvider
-from simplemind.settings import settings
+from ._base import BaseProvider
+from ..settings import settings
 
 PROVIDER_NAME = "anthropic"
 DEFAULT_MODEL = "claude-3-5-sonnet-20241022"
@@ -13,7 +12,7 @@ DEFAULT_MAX_TOKENS = 1000
 
 
 class Anthropic(BaseProvider):
-    __name__ = PROVIDER_NAME
+    NAME = PROVIDER_NAME
     DEFAULT_MODEL = DEFAULT_MODEL
 
     def __init__(self, api_key: Union[str, None] = None):
@@ -33,6 +32,8 @@ class Anthropic(BaseProvider):
 
     def send_conversation(self, conversation: "Conversation"):
         """Send a conversation to the Anthropic API."""
+        from ..models import Message
+
         messages = [
             {"role": msg.role, "content": msg.text} for msg in conversation.messages
         ]
@@ -43,8 +44,7 @@ class Anthropic(BaseProvider):
             max_tokens=DEFAULT_MAX_TOKENS,
         )
 
-        # Get the response content from the OpenAI response
-        # assistant_message = response.choices[0].message
+        # Get the response content from the Anthropic response
         assistant_message = response.content[0].text
 
         # Create and return a properly formatted Message instance
diff --git a/simplemind/providers/groq.py b/simplemind/providers/groq.py
index 4cd48f5..9fd4b71 100644
--- a/simplemind/providers/groq.py
+++ b/simplemind/providers/groq.py
@@ -3,16 +3,15 @@ from typing import Union
 import groq
 import instructor
 
-from simplemind.models import Conversation, Message
-from simplemind.providers._base import BaseProvider
-from simplemind.settings import settings
+from ._base import BaseProvider
+from ..settings import settings
 
 PROVIDER_NAME = "groq"
 DEFAULT_MODEL = "llama3-8b-8192"
 
 
 class Groq(BaseProvider):
-    __name__ = PROVIDER_NAME
+    NAME = PROVIDER_NAME
     DEFAULT_MODEL = DEFAULT_MODEL
 
     def __init__(self, api_key: Union[str, None] = None):
@@ -30,8 +29,10 @@ class Groq(BaseProvider):
         """A client patched with Instructor."""
         return instructor.from_groq(self.client)
 
-    def send_conversation(self, conversation: Conversation) -> Message:
+    def send_conversation(self, conversation: "Conversation") -> "Message":
         """Send a conversation to the Groq API."""
+        from ..models import Message
+
         messages = [
             {"role": msg.role, "content": msg.text} for msg in conversation.messages
         ]
diff --git a/simplemind/providers/openai.py b/simplemind/providers/openai.py
index 6302747..ee82105 100644
--- a/simplemind/providers/openai.py
+++ b/simplemind/providers/openai.py
@@ -3,16 +3,15 @@ from typing import Union
 import instructor
 import openai as oa
 
-from simplemind.models import Conversation, Message
-from simplemind.providers._base import BaseProvider
-from simplemind.settings import settings
+from ._base import BaseProvider
+from ..settings import settings
 
 PROVIDER_NAME = "openai"
 DEFAULT_MODEL = "gpt-4o-mini"
 
 
 class OpenAI(BaseProvider):
-    __name__ = PROVIDER_NAME
+    NAME = PROVIDER_NAME
     DEFAULT_MODEL = DEFAULT_MODEL
 
     def __init__(self, api_key: Union[str, None] = None):
@@ -32,6 +31,8 @@ class OpenAI(BaseProvider):
 
     def send_conversation(self, conversation: "Conversation"):
         """Send a conversation to the OpenAI API."""
+        from ..models import Message
+
         messages = [
             {"role": msg.role, "content": msg.text} for msg in conversation.messages
         ]
diff --git a/simplemind/providers/xai.py b/simplemind/providers/xai.py
index 6b22020..1d6e58b 100644
--- a/simplemind/providers/xai.py
+++ b/simplemind/providers/xai.py
@@ -3,9 +3,8 @@ from typing import Union
 import instructor
 import openai as oa
 
-from simplemind.models import Conversation, Message
-from simplemind.providers._base import BaseProvider
-from simplemind.settings import settings
+from ._base import BaseProvider
+from ..settings import settings
 
 PROVIDER_NAME = "xai"
 DEFAULT_MODEL = "grok-beta"
@@ -14,7 +13,7 @@ DEFAULT_MAX_TOKENS = 1000
 
 
 class XAI(BaseProvider):
-    __name__ = PROVIDER_NAME
+    NAME = PROVIDER_NAME
     DEFAULT_MODEL = DEFAULT_MODEL
 
     def __init__(self, api_key: Union[str, None] = None):
@@ -37,6 +36,7 @@ class XAI(BaseProvider):
 
     def send_conversation(self, conversation: "Conversation"):
         """Send a conversation to the OpenAI API."""
+        from ..models import Message
 
         messages = [
             {"role": msg.role, "content": msg.text} for msg in conversation.messages
diff --git a/simplemind/utils.py b/simplemind/utils.py
index 38e0c0d..7427312 100644
--- a/simplemind/utils.py
+++ b/simplemind/utils.py
@@ -1,13 +1,13 @@
 from typing import Union
 
-from simplemind.providers import providers
+from .providers import providers
 
 
 def find_provider(provider_name: Union[str, None]):
     """Find a provider by name."""
     if provider_name:
         for provider_class in providers:
-            if provider_class.__name__.lower() == provider_name.lower():
+            if provider_class.NAME.lower() == provider_name.lower():
                 # Instantiate the provider
                 return provider_class()
     raise ValueError(f"Provider {provider_name} not found")