diff --git a/letta/constants.py b/letta/constants.py
index 85d3d382..5f6e7361 100644
--- a/letta/constants.py
+++ b/letta/constants.py
@@ -192,10 +192,21 @@ CORE_MEMORY_LINE_NUMBER_WARNING = (
 # Constants to do with summarization / conversation length window
 # The max amount of tokens supported by the underlying model (eg 8k for gpt-4 and Mistral 7B)
 LLM_MAX_TOKENS = {
-    "DEFAULT": 8192,
+    "DEFAULT": 30000,
+    # deepseek
     "deepseek-chat": 64000,
     "deepseek-reasoner": 64000,
     ## OpenAI models: https://platform.openai.com/docs/models/overview
+    # reasoners
+    "o1": 200000,
+    # "o1-pro": 200000,  # responses API only
+    "o1-2024-12-17": 200000,
+    "o3": 200000,
+    "o3-2025-04-16": 200000,
+    "o3-mini": 200000,
+    "o3-mini-2025-01-31": 200000,
+    # "o3-pro": 200000,  # responses API only
+    # "o3-pro-2025-06-10": 200000,
     "gpt-4.1": 1047576,
     "gpt-4.1-2025-04-14": 1047576,
     "gpt-4.1-mini": 1047576,
@@ -209,6 +220,7 @@ LLM_MAX_TOKENS = {
     "chatgpt-4o-latest": 128000,
     # "o1-preview-2024-09-12
     "gpt-4o-2024-08-06": 128000,
+    "gpt-4o-2024-11-20": 128000,
     "gpt-4-turbo-preview": 128000,
     "gpt-4o": 128000,
     "gpt-3.5-turbo-instruct": 16385,
@@ -218,7 +230,7 @@ LLM_MAX_TOKENS = {
     # "davinci-002": 128000,
     "gpt-4-turbo-2024-04-09": 128000,
     # "gpt-4o-realtime-preview-2024-10-01
-    "gpt-4-turbo": 8192,
+    "gpt-4-turbo": 128000,
     "gpt-4o-2024-05-13": 128000,
     # "o1-mini
     # "o1-mini-2024-09-12