Update model.py

model.py

@@ -47,7 +47,7 @@ if not logger.handlers:
 class ModelConfig:
     """Centralised hyperparameter store for GreesyGPT."""
 
-    vocab_size: int = 8192
+    vocab_size: int = 200032
     context_len: int = 12_000
     n_embd: int = 768
     n_head: int = 12