diff --git a/apps/open-swe/src/utils/git.ts b/apps/open-swe/src/utils/git.ts
index 9311153a..7e72070d 100644
--- a/apps/open-swe/src/utils/git.ts
+++ b/apps/open-swe/src/utils/git.ts
@@ -596,8 +596,54 @@ export async function cloneRepo(
       // Don't log the full command with token for security reasons
       repoPath: `${targetRepository.owner}/${targetRepository.repo}`,
       branch: branchName,
+      baseCommit: targetRepository.baseCommit,
     });
-    return await sandbox.process.executeCommand(gitCloneCommand.join(" "));
+
+    const cloneResult = await sandbox.process.executeCommand(
+      gitCloneCommand.join(" "),
+    );
+
+    if (!targetRepository.baseCommit) {
+      if (cloneResult.exitCode !== 0) {
+        logger.error("Failed to clone repository", {
+          targetRepository,
+          cloneResult,
+        });
+        throw new Error("Failed to clone repository");
+      }
+      return cloneResult;
+    }
+
+    // If a baseCommit is specified, checkout that commit after cloning
+    const absoluteRepoDir = getRepoAbsolutePath(targetRepository);
+
+    logger.info("Checking out base commit", {
+      baseCommit: targetRepository.baseCommit,
+      repoPath: `${targetRepository.owner}/${targetRepository.repo}`,
+    });
+
+    const checkoutResult = await sandbox.process.executeCommand(
+      `git checkout ${targetRepository.baseCommit}`,
+      absoluteRepoDir,
+      undefined,
+      TIMEOUT_SEC,
+    );
+
+    if (checkoutResult.exitCode !== 0) {
+      logger.error("Failed to checkout base commit", {
+        baseCommit: targetRepository.baseCommit,
+        checkoutResult,
+      });
+      throw new Error(
+        `Failed to checkout base commit ${targetRepository.baseCommit}: ${checkoutResult.result}`,
+      );
+    }
+
+    logger.info("Successfully checked out base commit", {
+      baseCommit: targetRepository.baseCommit,
+    });
+
+    return cloneResult;
   } catch (e) {
     const errorFields = getSandboxErrorFields(e);
     logger.error("Failed to clone repository", errorFields ?? e);
diff --git a/packages/shared/src/open-swe/types.ts b/packages/shared/src/open-swe/types.ts
index b3740a91..0eb5f815 100644
--- a/packages/shared/src/open-swe/types.ts
+++ b/packages/shared/src/open-swe/types.ts
@@ -111,6 +111,7 @@ export type TargetRepository = {
   owner: string;
   repo: string;
   branch?: string;
+  baseCommit?: string;
 };
 
 export const GraphAnnotation = MessagesZodState.extend({