diff --git a/metagpt/provider/bedrock/utils.py b/metagpt/provider/bedrock/utils.py
index ee31da1b9..4f3be47ae 100644
--- a/metagpt/provider/bedrock/utils.py
+++ b/metagpt/provider/bedrock/utils.py
@@ -39,8 +39,8 @@ SUPPORT_STREAM_MODELS = {
     "meta.llama2-13b-chat-v1": 2000,
     "meta.llama2-70b-v1": 4000,
     "meta.llama2-70b-v1:0:4k": 4000,
-    "meta.llama2-70b-chat-v1": 4000,
-    "meta.llama2-70b-chat-v1:0:4k": 4000,
+    "meta.llama2-70b-chat-v1": 2000,
+    "meta.llama2-70b-chat-v1:0:4k": 2000,
     "meta.llama3-8b-instruct-v1:0": 2000,
     "meta.llama3-70b-instruct-v1:0": 2000,
     "mistral.mistral-7b-instruct-v0:2": 32000,