changed LLM model to meta-llama/Meta-Llama-3.1-8B-Instruct-Turbo

utils.py

@@ -53,7 +53,7 @@ def get_vector_store(text_chunks: List[str]) -> None:
 # ---------- QA chain helpers ----------------------------------------------
 def get_conversational_chain() -> Tuple[ChatTogether, PromptTemplate]:
     api_key = get_together_api_key()
-    llm = ChatTogether(model="meta-llama/Llama-3.3-70B-Instruct-Turbo-Free",
+    llm = ChatTogether(model="meta-llama/Meta-Llama-3.1-8B-Instruct-Turbo",
                        temperature=0.3, api_key=api_key)
     prompt = PromptTemplate(
         template=(