diff --git a/letta/constants.py b/letta/constants.py
index e5840be1..71d19d82 100644
--- a/letta/constants.py
+++ b/letta/constants.py
@@ -222,6 +222,7 @@ LLM_MAX_TOKENS = {
     "gpt-5-mini-2025-08-07": 272000,
     "gpt-5-nano": 272000,
     "gpt-5-nano-2025-08-07": 272000,
+    "gpt-5-codex": 272000,
     # reasoners
     "o1": 200000,
     # "o1-pro": 200000,  # responses API only