diff --git a/backend/src/models/task_attempt.rs b/backend/src/models/task_attempt.rs
index 96527dd6..e24074d5 100644
--- a/backend/src/models/task_attempt.rs
+++ b/backend/src/models/task_attempt.rs
@@ -127,6 +127,7 @@ pub struct BranchStatus {
     pub up_to_date: bool,
     pub merged: bool,
     pub has_uncommitted_changes: bool,
+    pub base_branch_name: String,
 }
 
 impl TaskAttempt {
@@ -252,7 +253,7 @@ impl TaskAttempt {
         // Now we need to merge the worktree branch into the main repository
         let branch_name = format!("attempt-{}", attempt_id);
 
-        // Get the main branch (usually "main" or "master")
+        // Get the current base branch name (e.g., "main", "master", "develop", etc.)
         let main_branch = main_repo.head()?.shorthand().unwrap_or("main").to_string();
 
         // Fetch the worktree branch into the main repository
@@ -273,7 +274,7 @@ impl TaskAttempt {
             "Import worktree changes",
         )?;
 
-        // Now merge the branch into main
+        // Now merge the branch into the base branch
         let main_branch_commit = main_repo
             .reference_to_annotated_commit(&main_repo.find_reference(&main_branch_ref)?)?;
         let worktree_branch_commit = main_repo
@@ -1222,7 +1223,10 @@ impl TaskAttempt {
         // Open the worktree repository
         let worktree_repo = Repository::open(&attempt.worktree_path)?;
 
-        // Get the current HEAD of main branch in the main repo
+        // Get the base branch name from the main repository
+        let base_branch_name = main_repo.head()?.shorthand().unwrap_or("main").to_string();
+
+        // Get the current HEAD of base branch in the main repo
         let main_head = main_repo.head()?.peel_to_commit()?;
         let main_oid = main_head.id();
 
@@ -1250,6 +1254,7 @@ impl TaskAttempt {
                 up_to_date: true,
                 merged: attempt.merge_commit.is_some(),
                 has_uncommitted_changes,
+                base_branch_name,
             });
         }
 
@@ -1274,6 +1279,7 @@ impl TaskAttempt {
             up_to_date: commits_behind == 0 && commits_ahead == 0,
             merged: attempt.merge_commit.is_some(),
             has_uncommitted_changes,
+            base_branch_name,
         })
     }
 
diff --git a/frontend/src/pages/task-attempt-compare.tsx b/frontend/src/pages/task-attempt-compare.tsx
index d17d004a..8649a5d9 100644
--- a/frontend/src/pages/task-attempt-compare.tsx
+++ b/frontend/src/pages/task-attempt-compare.tsx
@@ -50,7 +50,6 @@ export function TaskAttemptComparePage() {
   const [error, setError] = useState<string | null>(null);
   const [merging, setMerging] = useState(false);
   const [rebasing, setRebasing] = useState(false);
-  const [mergeSuccess, setMergeSuccess] = useState(false);
   const [rebaseSuccess, setRebaseSuccess] = useState(false);
   const [expandedSections, setExpandedSections] = useState<Set<string>>(
     new Set()
@@ -150,7 +149,6 @@ export function TaskAttemptComparePage() {
       if (response.ok) {
         const result: ApiResponse<string> = await response.json();
         if (result.success) {
-          setMergeSuccess(true);
           // Refetch both diff and branch status to show updated state
           fetchDiff();
           fetchBranchStatus();
@@ -493,15 +491,15 @@ export function TaskAttemptComparePage() {
                 {branchStatus.up_to_date ? (
                   <span className="text-green-600">Up to date</span>
                 ) : branchStatus.is_behind === true ? (
-                  <span className="text-orange-600">
-                    {branchStatus.commits_behind} commit
-                    {branchStatus.commits_behind !== 1 ? "s" : ""} behind main
-                  </span>
+                <span className="text-orange-600">
+                {branchStatus.commits_behind} commit
+                {branchStatus.commits_behind !== 1 ? "s" : ""} behind {branchStatus.base_branch_name}
+                </span>
                 ) : (
-                  <span className="text-blue-600">
-                    {branchStatus.commits_ahead} commit
-                    {branchStatus.commits_ahead !== 1 ? "s" : ""} ahead of main
-                  </span>
+                <span className="text-blue-600">
+                {branchStatus.commits_ahead} commit
+                {branchStatus.commits_ahead !== 1 ? "s" : ""} ahead of {branchStatus.base_branch_name}
+                </span>
                 )}
               </div>
               {branchStatus.has_uncommitted_changes && (
@@ -524,11 +522,6 @@ export function TaskAttemptComparePage() {
               Branch rebased successfully!
             </div>
           )}
-          {mergeSuccess && (
-            <div className="text-green-600 text-sm">
-              Changes merged successfully!
-            </div>
-          )}
 
           {/* Action Buttons */}
           <div className="flex items-center gap-2">
@@ -544,7 +537,7 @@ export function TaskAttemptComparePage() {
                   <RefreshCw
                     className={`mr-2 h-4 w-4 ${rebasing ? "animate-spin" : ""}`}
                   />
-                  {rebasing ? "Rebasing..." : "Rebase onto Main"}
+                  {rebasing ? "Rebasing..." : `Rebase onto ${branchStatus.base_branch_name}`}
                 </Button>
               )}
             {!branchStatus?.merged && (
@@ -762,7 +755,7 @@ export function TaskAttemptComparePage() {
             <div className="bg-yellow-50 border border-yellow-200 rounded-md p-3">
               <p className="text-sm text-yellow-800">
                 <strong>Warning:</strong> The worktree contains uncommitted changes (modified, added, or deleted files) 
-                that have not been committed to git. These changes will be permanently merged into the main branch.
+                that have not been committed to git. These changes will be permanently merged into the {branchStatus?.base_branch_name || 'base'} branch.
               </p>
             </div>
           </div>
diff --git a/shared/types.ts b/shared/types.ts
index 26ca899a..e1c26565 100644
--- a/shared/types.ts
+++ b/shared/types.ts
@@ -70,7 +70,7 @@ export type FileDiff = { path: string, chunks: Array<DiffChunk>, };
 
 export type WorktreeDiff = { files: Array<FileDiff>, };
 
-export type BranchStatus = { is_behind: boolean, commits_behind: number, commits_ahead: number, up_to_date: boolean, merged: boolean, has_uncommitted_changes: boolean, };
+export type BranchStatus = { is_behind: boolean, commits_behind: number, commits_ahead: number, up_to_date: boolean, merged: boolean, has_uncommitted_changes: boolean, base_branch_name: string, };
 
 export type ExecutionProcess = { id: string, task_attempt_id: string, process_type: ExecutionProcessType, executor_type: string | null, status: ExecutionProcessStatus, command: string, args: string | null, working_directory: string, stdout: string | null, stderr: string | null, exit_code: bigint | null, started_at: string, completed_at: string | null, created_at: string, updated_at: string, };