diff --git a/src/vs/workbench/contrib/chat/common/model/chatSessionOperationLog.ts b/src/vs/workbench/contrib/chat/common/model/chatSessionOperationLog.ts
index c1cf5de1c14..df6f2f227a1 100644
--- a/src/vs/workbench/contrib/chat/common/model/chatSessionOperationLog.ts
+++ b/src/vs/workbench/contrib/chat/common/model/chatSessionOperationLog.ts
@@ -62,6 +62,7 @@ const responsePartSchema = Adapt.v<IChatProgressResponseContent, SerializedChatR
 				case 'textEditGroup':
 				case 'multiDiffData':
 				case 'mcpServersStarting':
+				case 'thinking':
 					return objectsEqual(a, b);
 
 				// Static types that won't change after being pushed can use strict equality.
@@ -77,7 +78,6 @@ const responsePartSchema = Adapt.v<IChatProgressResponseContent, SerializedChatR
 				case 'progressMessage':
 				case 'pullRequest':
 				case 'questionCarousel':
-				case 'thinking':
 				case 'undoStop':
 				case 'warning':
 				case 'treeData':