diff --git a/g4f/client/stubs.py b/g4f/client/stubs.py
index 4287ca86..2441e287 100644
--- a/g4f/client/stubs.py
+++ b/g4f/client/stubs.py
@@ -1 +1,106 @@
-#
\ No newline at end of file
+from __future__ import annotations
+
+from typing import Union
+
+class Model():
+    ...
+
+class ChatCompletion(Model):
+    def __init__(
+        self,
+        content: str,
+        finish_reason: str,
+        completion_id: str = None,
+        created: int = None
+    ):
+        self.id: str = f"chatcmpl-{completion_id}" if completion_id else None
+        self.object: str = "chat.completion"
+        self.created: int = created
+        self.model: str = None
+        self.provider: str = None
+        self.choices = [ChatCompletionChoice(ChatCompletionMessage(content), finish_reason)]
+        self.usage: dict[str, int] = {
+            "prompt_tokens": 0, #prompt_tokens,
+            "completion_tokens": 0, #completion_tokens,
+            "total_tokens": 0, #prompt_tokens + completion_tokens,
+        }
+
+    def to_json(self):
+        return {
+            **self.__dict__,
+            "choices": [choice.to_json() for choice in self.choices]
+        }
+
+class ChatCompletionChunk(Model):
+    def __init__(
+        self,
+        content: str,
+        finish_reason: str,
+        completion_id: str = None,
+        created: int = None
+    ):
+        self.id: str = f"chatcmpl-{completion_id}" if completion_id else None
+        self.object: str = "chat.completion.chunk"
+        self.created: int = created
+        self.model: str = None
+        self.provider: str = None
+        self.choices = [ChatCompletionDeltaChoice(ChatCompletionDelta(content), finish_reason)]
+
+    def to_json(self):
+        return {
+            **self.__dict__,
+            "choices": [choice.to_json() for choice in self.choices]
+        }
+
+class ChatCompletionMessage(Model):
+    def __init__(self, content: Union[str, None]):
+        self.role = "assistant"
+        self.content = content
+
+    def to_json(self):
+        return self.__dict__
+
+class ChatCompletionChoice(Model):
+    def __init__(self, message: ChatCompletionMessage, finish_reason: str):
+        self.index = 0
+        self.message = message
+        self.finish_reason = finish_reason
+
+    def to_json(self):
+        return {
+            **self.__dict__,
+            "message": self.message.to_json()
+        }
+
+class ChatCompletionDelta(Model):
+    content: Union[str, None] = None
+
+    def __init__(self, content: Union[str, None]):
+        if content is not None:
+            self.content = content
+
+    def to_json(self):
+        return self.__dict__
+
+class ChatCompletionDeltaChoice(Model):
+    def __init__(self, delta: ChatCompletionDelta, finish_reason: Union[str, None]):
+        self.delta = delta
+        self.finish_reason = finish_reason
+
+    def to_json(self):
+        return {
+            **self.__dict__,
+            "delta": self.delta.to_json()
+        }
+
+class Image(Model):
+    url: str
+
+    def __init__(self, url: str) -> None:
+        self.url = url
+
+class ImagesResponse(Model):
+    data: list[Image]
+
+    def __init__(self, data: list) -> None:
+        self.data = data