diff --git a/pr_agent/algo/__init__.py b/pr_agent/algo/__init__.py
index 23c9795b..a2b35e71 100644
--- a/pr_agent/algo/__init__.py
+++ b/pr_agent/algo/__init__.py
@@ -64,10 +64,13 @@ MAX_TOKENS = {
     'vertex_ai/gemini-1.5-flash': 1048576,
     'vertex_ai/gemini-2.0-flash': 1048576,
     'vertex_ai/gemini-2.5-flash-preview-04-17': 1048576,
+    'vertex_ai/gemini-2.5-flash-preview-05-20': 1048576,
     'vertex_ai/gemma2': 8200,
     'gemini/gemini-1.5-pro': 1048576,
     'gemini/gemini-1.5-flash': 1048576,
     'gemini/gemini-2.0-flash': 1048576,
+    'gemini/gemini-2.5-flash-preview-04-17': 1048576,
+    'gemini/gemini-2.5-flash-preview-05-20': 1048576,
     'gemini/gemini-2.5-pro-preview-03-25': 1048576,
     'gemini/gemini-2.5-pro-preview-05-06': 1048576,
     'codechat-bison': 6144,