diff --git a/src/openai_messages_token_helper/model_helper.py b/src/openai_messages_token_helper/model_helper.py
index 3dc8f85..cb6e2e8 100644
--- a/src/openai_messages_token_helper/model_helper.py
+++ b/src/openai_messages_token_helper/model_helper.py
@@ -40,13 +40,17 @@
     "gpt-5-mini": 272000,
     "gpt-5-nano": 272000,
     "gpt-5-chat": 128000,
+    "gpt-5.1": 272000,
+    "gpt-5.1-chat": 111616,
+    "gpt-5.2": 272000,
+    "gpt-5.2-chat": 111616,
 }
 
 
 AOAI_2_OAI = {"gpt-35-turbo": "gpt-3.5-turbo", "gpt-35-turbo-16k": "gpt-3.5-turbo-16k", "gpt-4v": "gpt-4-turbo-vision"}
 
 # Set of reasoning models that cannot have token usage pre-estimated
-REASONING_MODELS = {"gpt-5", "gpt-5-mini", "gpt-5-nano"}
+REASONING_MODELS = {"gpt-5", "gpt-5-mini", "gpt-5-nano", "gpt-5.1", "gpt-5.1-chat", "gpt-5.2"}
 
 logger = logging.getLogger("openai_messages_token_helper")
 
diff --git a/tests/test_modelhelper.py b/tests/test_modelhelper.py
index 3b79e54..bec164c 100644
--- a/tests/test_modelhelper.py
+++ b/tests/test_modelhelper.py
@@ -20,6 +20,10 @@ def test_get_token_limit():
     assert get_token_limit("gpt-5-mini") == 272000
     assert get_token_limit("gpt-5-nano") == 272000
     assert get_token_limit("gpt-5-chat") == 128000
+    assert get_token_limit("gpt-5.1") == 272000
+    assert get_token_limit("gpt-5.1-chat") == 111616
+    assert get_token_limit("gpt-5.2") == 272000
+    assert get_token_limit("gpt-5.2-chat") == 111616
 
 
 def test_get_token_limit_error():