2 files changed, 12 insertions, 6 deletions

diff --git a/g4f/__init__.py b/g4f/__init__.py
index 6c8e100e..6716c727 100644
--- a/g4f/__init__.py
+++ b/g4f/__init__.py
@@ -10,6 +10,7 @@ from .cookies  import get_cookies, set_cookies
 from .         import debug, version
 from .providers.types import BaseRetryProvider, ProviderType
 from .providers.base_provider import ProviderModelMixin
+from .providers.retry_provider import RetryProvider
 
 def get_model_and_provider(model    : Union[Model, str], 
                            provider : Union[ProviderType, str, None], 
@@ -43,7 +44,12 @@ def get_model_and_provider(model    : Union[Model, str],
         version.utils.check_version()
        
     if isinstance(provider, str):
-        if provider in ProviderUtils.convert:
+        if " " in provider:
+            provider_list = [ProviderUtils.convert[p] for p in provider.split() if p in ProviderUtils.convert]
+            if not provider_list:
+                raise ProviderNotFoundError(f'Providers not found: {provider}')
+            provider = RetryProvider(provider_list, False)
+        elif provider in ProviderUtils.convert:
             provider = ProviderUtils.convert[provider]
         else:
             raise ProviderNotFoundError(f'Provider not found: {provider}')
diff --git a/g4f/api/__init__.py b/g4f/api/__init__.py
index 18268eec..abfe3b04 100644
--- a/g4f/api/__init__.py
+++ b/g4f/api/__init__.py
@@ -16,12 +16,12 @@ from g4f.typing import Messages
 class ChatCompletionsConfig(BaseModel):
     messages: Messages
     model: str
-    provider: Union[str, None] 
+    provider: Union[str, None] = None
     stream: bool = False
-    temperature: Union[float, None] 
-    max_tokens: int = None
-    stop: Union[list[str], str, None]
-    api_key: Union[str, None]
+    temperature: Union[float, None] = None
+    max_tokens: Union[int, None] = None
+    stop: Union[list[str], str, None] = None
+    api_key: Union[str, None] = None
 
 class Api:
     def __init__(self, engine: g4f, debug: bool = True, sentry: bool = False,