diff --git a/libs/partners/openai/langchain_openai/llms/base.py b/libs/partners/openai/langchain_openai/llms/base.py
index dc4e621e244..a3c2dfb128f 100644
--- a/libs/partners/openai/langchain_openai/llms/base.py
+++ b/libs/partners/openai/langchain_openai/llms/base.py
@@ -670,6 +670,16 @@ class BaseOpenAI(BaseLLM):
             ```
         """
         model_token_mapping = {
+            "gpt-5.2": 400_000,
+            "gpt-5.2-2025-12-11": 400_000,
+            "gpt-5.1": 400_000,
+            "gpt-5.1-2025-11-13": 400_000,
+            "gpt-5": 400_000,
+            "gpt-5-2025-08-07": 400_000,
+            "gpt-5-mini": 400_000,
+            "gpt-5-mini-2025-08-07": 400_000,
+            "gpt-5-nano": 400_000,
+            "gpt-5-nano-2025-08-07": 400_000,
             "gpt-4o-mini": 128_000,
             "gpt-4o": 128_000,
             "gpt-4o-2024-05-13": 128_000,