1 files changed, 6 insertions, 3 deletions

diff --git a/g4f/__init__.py b/g4f/__init__.py
index d8681297..a49e60e9 100644
--- a/g4f/__init__.py
+++ b/g4f/__init__.py
@@ -16,14 +16,17 @@ class ChatCompletion:
         auth     : Union[str, None]                = None, **kwargs: Any) -> Union[CreateResult, str]:
 
         if isinstance(model, str):
-            try:
+            if model in models.ModelUtils.convert:
                 model = models.ModelUtils.convert[model]
-            except KeyError:
+            else:
                 raise Exception(f'The model: {model} does not exist')
 
         if not provider:
             if isinstance(model.best_provider, list):
-                provider = random.choice(model.best_provider)
+                if stream:
+                    provider = random.choice([p for p in model.best_provider if p.supports_stream])
+                else:
+                    provider = random.choice(model.best_provider)
             else:
                 provider = model.best_provider