add support for open-mixtral-8x7b (#11792)

llama-index-integrations/llms/llama-index-llms-mistralai/llama_index/llms/mistralai/utils.py

@@ -5,6 +5,11 @@ MISTRALAI_MODELS: Dict[str, int] = {
     "mistral-small": 32000,
     "mistral-medium": 32000,
     "mistral-large": 32000,
+    "open-mixtral-8x7b": 32000,
+    "open-mistral-7b": 32000,
+    "mistral-small-latest": 32000,
+    "mistral-medium-latest": 32000,
+    "mistral-large-latest": 32000,
 }