: GitBench
Rebase with multiple branches - find lost commit from feature branch
Tests ability to find lost commits from a feature branch after rebase with multiple branches. Evaluates multi-branch reflog analysis.

These commands set up the repo before the model sees the prompt. They define the starting file structure, staged changes, and Git history.

  1. 01 git init
  2. 02 git config user.email 'test@test.com'
  3. 03 git config user.name 'Test User'
  4. 04 echo 'v1.0' > version.txt
  5. 05 git add version.txt
  6. 06 git commit -m 'Release v1.0'
  7. 07 git checkout -b feature-x
  8. 08 echo 'export A' > env.sh
  9. 09 git add env.sh
  10. 10 git commit -m 'Add env export A'
  11. 11 echo 'export B' >> env.sh
  12. 12 git add env.sh
  13. 13 git commit -m 'Add env export B - enables feature X'
  14. 14 git checkout main
  15. 15 git merge feature-x
  16. 16 git branch -D feature-x
Prompt
After merging and deleting 'feature-x', you need to recover the commit 'Add env export B - enables feature X' which was the last commit on that branch. Use git reflog to identify what git command to run.
Expected
Add env export B - enables feature X
Loading campaign evidence…
deepseek/deepseek-v4-flash:high PASS 100% 269 in → 887 out (698 reasoning)
Based on the reflog, the commit `Add env export B - enables feature X` has the hash `9a974bf5c978242953fb86be5d119d30ea720bc0`. After merging and deleting the `feature-x` branch, you can recover this commit by recreating the branch at that commit. Run the following command to restore the branch: ```bash git branch feature-x 9a974bf5c978242953fb86be5d119d30ea720bc0 ``` Alternatively, to check out the commit directly and create the branch in one step: ```bash git checkout -b feature-x 9a974bf5c978242953fb86be5d119d30ea720bc0 ```
deepseek/deepseek-v4-flash:none PASS 100% 275 in → 251 out (0 reasoning)
Based on the reflog, you can see that the commit `Add env export B - enables feature X` is at `HEAD@{2}` with the hash `c0af884e95af6e0cd2705d5ddeba978f85413c70`. Since this commit was the last commit on the `feature-x` branch before it was merged (fast-forward) into main, and the merge was a fast-forward (meaning the branch pointer just moved forward), the commit is now part of `main`'s history. But since you want to "recover" it after deleting `feature-x`, you can simply checkout that commit directly. **The git command to run:** ```bash git checkout c0af884e95af6e0cd2705d5ddeba978f85413c70 ``` Or, if you want to create a new branch at that point: ```bash git checkout -b recovered-feature-x c0af884e95af6e0cd2705d5ddeba978f85413c70 ``` Either way, you'll be at the commit that contains the "Add env export B - enables feature X" changes.
deepseek/deepseek-v4-flash:none__json_schema PASS 100% 269 in → 29 out (0 reasoning)
08ea9aaab0f4fa156463cb8532b0e8ceccc2131e
JSON Schema Structured Output
(raw) {"ref":"08ea9aaab0f4fa156463cb8532b0e8ceccc2131e" }
mistralai/devstral-2512 PASS 100% 350 in → 296 out
Based on the `git reflog` output, the commit you want to recover is `4e6cacae09929437da1bb1f2ba8bcadcc1303164` (the one with the message "Add env export B - enables feature X"). Since this commit was the last one on the `feature-x` branch before it was merged and deleted, you can recover it by creating a new branch at that commit: ```bash git branch feature-x-recovered 4e6cacae09929437da1bb1f2ba8bcadcc1303164 ``` This will create a new branch called `feature-x-recovered` pointing to that commit. You can then check it out if needed: ```bash git checkout feature-x-recovered ``` Alternatively, if you just want to cherry-pick that specific commit onto your current branch: ```bash git cherry-pick 4e6cacae09929437da1bb1f2ba8bcadcc1303164 ``` The reflog shows that this commit was made on the `feature-x` branch (HEAD@{2}) before it was merged into main (HEAD@{0}). The commit is still in your repository's object database, so it can be recovered using its hash.
mistralai/devstral-2512__json_schema PASS 100% 349 in → 41 out
7bc57ffefa0237267ea5186188783b9e2a581699
JSON Schema Structured Output
(raw) {"ref": "7bc57ffefa0237267ea5186188783b9e2a581699"}
nvidia/nemotron-3-nano-30b-a3b:high PASS 100% 349 in → 555 out (341 reasoning)
The commit you want is reached by the reflog entry **HEAD@{2}** (the line that says `commit: Add env export B - enables feature X`). To recover it you can simply create a new branch pointing at that commit (or check it out directly). **Command to run** ```bash git checkout -b feature-x-recover HEAD@{2} ``` * What this does: * `HEAD@{2}` points to the third entry in your reflog, which is the exact commit hash of **“Add env export B - enables feature X”**. * `git checkout -b …` creates a new branch named `feature-x-recover` (you can pick any name you like) that starts at that commit, giving you a reference to the lost commit. If you prefer just to create a branch without checking it out immediately, you can also use: ```bash git branch feature-x-recover HEAD@{2} ``` Either way restores the missing commit. You can then merge it, push it, or do whatever you need with it.
nvidia/nemotron-3-nano-30b-a3b:none PASS 100% 358 in → 461 out (0 reasoning)
**Answer** The reflog entry you want is the **third line** shown: ``` 7fefb935e09dd03415daac256b3dfb7ef85ec98c HEAD@{2}: commit: Add env export B - enables feature X ``` That entry corresponds to the commit **`Add env export B - enables feature X`**, which was the last commit on branch **`feature-x`**. --- ### What git command should you run? To recover (check out) that specific commit, run: ```bash git checkout 7fefb935e09dd03415daac256b3dfb7ef85ec98c ``` or, for readability, you can use the shorter "short name" that Git suggests (the ABI prefix shown in the reflog): ```bash git checkout HEAD@{2} ``` Both commands will place you on that commit, giving you access to the files exactly as they were after the `Add env export B - enables feature X` commit. --- ### Why this works * `git reflog` records **where HEAD has been moved**. `HEAD@{n}` refers to the **state of HEAD `n` entries ago**. * After the hard‑reset (or checkout + delete) of `feature-x`, `HEAD` now points at the merge commit (`8847b376…`). The reflog entry `@{2}` is the commit that preceded the merge—that is the “Add env export B …” commit. * `git checkout HEAD@{2}` simply moves the current HEAD back to that commit, effectively restoring the branch tip to the desired state. --- ### Quick sanity check ```bash $ git log -1 --oneline Add env export B - enables feature X # <-- you should see this line ``` If the log shows the exact commit message you were looking for, you have successfully recovered it. --- **Summary:** Use `git checkout HEAD@{2}` (or the full SHA) to restore the lost commit. No further options or special commands are needed.
nvidia/nemotron-3-nano-30b-a3b:none__json_schema PASS 100% 343 in → 49 out (0 reasoning)
e314518e9e3e138adbc537a3adee934384120e87#HEAD@{2}
JSON Schema Structured Output
(raw) { "ref": "e314518e9e3e138adbc537a3adee934384120e87#HEAD@{2}" }
poolside/laguna-xs.2:high PASS 100% 382 in → 520 out (299 reasoning)
Based on the git reflog, I can see the commit you want to recover: - `HEAD@{2}` shows: `d0dbc5ae9d563fc081158c232bc18184de25a23e HEAD@{2}: commit: Add env export B - enables feature X` The commit hash for "Add env export B - enables feature X" is **`d0dbc5ae9d563fc081158c232bc18184de25a23e`**. To recover this commit, you should run: ```bash git cherry-pick d0dbc5ae9d563fc081158c232bc18184de25a23e ``` This will apply the changes from that commit onto your current branch (main). The `git cherry-pick` command is perfect for recovering individual commits that were part of a deleted branch.
poolside/laguna-xs.2:high__json_schema PASS 100% 386 in → 1,196 out (1,154 reasoning)
214f45958e686200cf9bd37e6da36fa85fb7db95
JSON Schema Structured Output
(raw) {"ref": "214f45958e686200cf9bd37e6da36fa85fb7db95"}
poolside/laguna-xs.2:none PASS 100% 386 in → 202 out (0 reasoning)
To recover the commit 'Add env export B - enables feature X' from the deleted 'feature-x' branch, you can use the commit hash found in the reflog. The commit is referenced at `HEAD@{2}` with hash `8c5bc3f854868cece41db1f1508822c637cdb748`. You can recover it by checking out that specific commit: ```bash git checkout 8c5bc3f854868cece41db1f1508822c637cdb748 ``` Alternatively, if you want to restore it as a new branch: ```bash git checkout -b restore-feature-x 8c5bc3f854868cece41db1f1508822c637cdb748 ```
poolside/laguna-xs.2:none__json_schema PASS 100% 375 in → 37 out (0 reasoning)
abe83362dfb9ded8ac8cd95ce2bb1759f6c83a70
JSON Schema Structured Output
(raw) {"ref": "abe83362dfb9ded8ac8cd95ce2bb1759f6c83a70"}
Invalid JSON. Output: The commit `Add env export B - enables feature X` (hash `227d9e3`) is still reachable from `main` after the fast-forward merge. However, to restore the deleted branch `feature-x` pointing to this commit, run: ```bash git branch feature-x 227d9e3ad7faa18fa017b139fe02e69e09dd1047 ```
JSON Schema Structured Output
Structured Output Error
Failed to parse structured JSON response: Expecting value: line 1 column 1 (char 0)
Failure: Failed to parse structured JSON response: Expecting value: line 1 column 1 (char 0)
nvidia/nemotron-3-nano-30b-a3b:high__json_schema FAIL 0% 355 in → 452 out (382 reasoning)
refs/heads/main
JSON Schema Structured Output
(raw) { "ref": "refs/heads/main" }
Failure: Expected output to mention target hash prefix/full hash or matching HEAD@{n} selector for 'Add env export B - enables feature X'