diff --git a/CHANGELOG.md b/CHANGELOG.md
index 31066d5c..365d74d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ All notable changes to this project will be documented in this file.
 - Shortcuts: Switched agent cycling shortcut from TAB to Shift + TAB.
 - Skills: added autocomplete for skills on "/" when it is not the first character in input.
 - Autocomplete: added scope badges for commands/agents/skills.
+- Compact: changed /summarize command to be /compact and use sdk for compaction.
 
 
 ## [1.4.4] - 2026-01-08
diff --git a/packages/ui/src/components/chat/ChatInput.tsx b/packages/ui/src/components/chat/ChatInput.tsx
index 55838646..3630e0cb 100644
--- a/packages/ui/src/components/chat/ChatInput.tsx
+++ b/packages/ui/src/components/chat/ChatInput.tsx
@@ -458,9 +458,27 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
                 setMessage('');
                 return; // Don't send to assistant
             }
-            // Existing: /summarize command scroll
-            else if (commandName === 'summarize') {
-                scrollToBottom?.({ instant: true, force: true });
+            // /compact - call SDK summarize endpoint
+            else if (commandName === 'compact' && currentSessionId) {
+                try {
+                    const { opencodeClient } = await import('@/lib/opencode/client');
+                    const directory = opencodeClient.getDirectory();
+                    const response = await opencodeClient.getApiClient().session.summarize({
+                        sessionID: currentSessionId,
+                        directory: directory || undefined,
+                        providerID: currentProviderId,
+                        modelID: currentModelId,
+                    });
+                    if (response.error) {
+                        throw new Error('Failed to compact session');
+                    }
+                    scrollToBottom?.({ instant: true, force: true });
+                } catch (error) {
+                    console.error('Failed to compact session:', error);
+                    toast.error('Failed to compact session');
+                }
+                setMessage('');
+                return; // Don't send to assistant
             }
         }
 
diff --git a/packages/ui/src/components/chat/ChatMessage.tsx b/packages/ui/src/components/chat/ChatMessage.tsx
index 7e523a0e..b7d0ce7e 100644
--- a/packages/ui/src/components/chat/ChatMessage.tsx
+++ b/packages/ui/src/components/chat/ChatMessage.tsx
@@ -144,7 +144,7 @@ const ChatMessage: React.FC<ChatMessageProps> = ({
         return message.parts.map((part) => {
             const rawPart = part as Record<string, unknown>;
             if (rawPart.type === 'compaction') {
-                return { type: 'text', text: '/summarize' } as Part;
+                return { type: 'text', text: '/compact' } as Part;
             }
             return part;
         });
diff --git a/packages/ui/src/components/chat/CommandAutocomplete.tsx b/packages/ui/src/components/chat/CommandAutocomplete.tsx
index 360464ea..3fce50f9 100644
--- a/packages/ui/src/components/chat/CommandAutocomplete.tsx
+++ b/packages/ui/src/components/chat/CommandAutocomplete.tsx
@@ -98,7 +98,7 @@ export const CommandAutocomplete = React.forwardRef<CommandAutocompleteHandle, C
               ]
             : []
           ),
-          { name: 'summarize', description: 'Generate a summary of the current session', isBuiltIn: true },
+          { name: 'compact', description: 'Compress session history using AI to reduce context size', isBuiltIn: true },
         ];
 
         const commandMap = new Map<string, CommandInfo>();
@@ -142,7 +142,7 @@ export const CommandAutocomplete = React.forwardRef<CommandAutocompleteHandle, C
               ]
             : []
           ),
-          { name: 'summarize', description: 'Generate a summary of the current session', isBuiltIn: true },
+          { name: 'compact', description: 'Compress session history using AI to reduce context size', isBuiltIn: true },
         ];
 
         const filtered = (searchQuery
@@ -215,7 +215,7 @@ export const CommandAutocomplete = React.forwardRef<CommandAutocompleteHandle, C
         return <RiArrowGoForwardLine className="h-3.5 w-3.5 text-orange-500" />;
       case 'timeline':
         return <RiTimeLine className="h-3.5 w-3.5 text-blue-500" />;
-      case 'summarize':
+      case 'compact':
         return <RiScissorsLine className="h-3.5 w-3.5 text-purple-500" />;
       case 'test':
       case 'build':