diff --git a/tiktoken/model.py b/tiktoken/model.py
index 0f9c011..5c669af 100644
--- a/tiktoken/model.py
+++ b/tiktoken/model.py
@@ -32,6 +32,7 @@
     "o3": "o200k_base",
     "o4-mini": "o200k_base",
     # chat
+    "gpt-5": "o200k_base",
     "gpt-4.1": "o200k_base",
     "gpt-4o": "o200k_base",
     "gpt-4": "cl100k_base",