diff --git a/checkpoint.json b/checkpoint.json
index a2a86b39b..0e8857ed9 100644
--- a/checkpoint.json
+++ b/checkpoint.json
@@ -1,30 +1,37 @@
 {
-  "timestamp": "2026-03-16T05:32:47.397023Z",
-  "current_node": "setup",
+  "timestamp": "2026-03-16T05:38:01.774775Z",
+  "current_node": "solve",
   "completed_nodes": [
     "start",
-    "setup"
+    "setup",
+    "solve"
   ],
   "node_retries": {
     "setup": 1,
+    "solve": 1,
     "start": 1
   },
   "context_values": {
+    "internal.retry_count.solve": 1,
     "internal.node_visit_count": 1,
-    "current_node": "setup",
+    "current_node": "solve",
+    "response.solve": "Implemented the Django fix for this issue.\n\nWhat changed:\n- `django/db/models/fields/__init__.py`\n  - Added a system check in `Field._check_choices()` to compute the longest string choice value and raise `fields.E009` when `max_length` is too small.\n  - Kept it safe for grouped choices with non-string values.\n- `tests/invalid_models_tests/test_ordinary_fields.py`\n  - Added regression tests for both flat and grouped `choices` where a choice value exceeds `max_length`.\n\nValidation:\n- `python -m pip install -e .`\n- `python tests/runtests.py invalid_models_tests.test_ordinary_fields --parallel 1`\n\nNotes:\n- The provided setup failed because the workspace wasn't empty, so I overlaid the Django source at the requested commit into the workspace before applying the fix.",
     "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n",
     "thread.start.current_node": "setup",
-    "outcome": "fail",
+    "outcome": "success",
     "graph.goal": "Add check to ensure max_length fits longest choice.\nDescription\n\t\nThere is currently no check to ensure that Field.max_length is large enough to fit the longest value in Field.choices.\nThis would be very helpful as often this mistake is not noticed until an attempt is made to save a record with those values that are too long.\n",
-    "current.preamble": "Goal: Add check to ensure max_length fits longest choice.\nDescription\n\t\nThere is currently no check to ensure that Field.max_length is large enough to fit the longest value in Field.choices.\nThis would be very helpful as often this mistake is not noticed until an attempt is made to save a record with those values that are too long.\n\n",
+    "current.preamble": "Goal: Add check to ensure max_length fits longest choice.\nDescription\n\t\nThere is currently no check to ensure that Field.max_length is large enough to fit the longest value in Field.choices.\nThis would be very helpful as often this mistake is not noticed until an attempt is made to save a record with those values that are too long.\n\n\n## Completed stages\n- **setup**: fail\n  - Script: `git clone https://github.com/django/django.git . && git checkout fee75d2aed4e58ada6567c464cfd22e89dc65f4a && python -m pip install -e .`\n  - Stdout:\n    ```\n    fatal: destination path '.' already exists and is not an empty directory.\n    ```\n  - Stderr: (empty)\n\n## Context\n- failure_class: deterministic\n- failure_signature: setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.\n",
     "graph.rankdir": "LR",
     "internal.retry_count.start": 1,
     "command.stderr": "",
     "internal.fidelity": "compact",
-    "failure_class": "deterministic",
+    "last_stage": "solve",
+    "failure_class": "",
     "internal.retry_count.setup": 1,
-    "internal.thread_id": "start",
-    "failure_signature": "setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.",
+    "internal.thread_id": "setup",
+    "last_response": "Implemented the Django fix for this issue.\n\nWhat changed:\n- `django/db/models/fields/__init__.py`\n  - Added a system check in `Field._check_choices()` to compute the longest string choice value and ra",
+    "failure_signature": "",
+    "thread.setup.current_node": "solve",
     "internal.run_id": "01KKTJ3NZ9ZV9WZ1BGNQKEGSXH"
   },
   "logs": [],
@@ -44,13 +51,32 @@
         "failure_class": "deterministic"
       },
       "duration_ms": 54
+    },
+    "solve": {
+      "status": "success",
+      "context_updates": {
+        "last_response": "Implemented the Django fix for this issue.\n\nWhat changed:\n- `django/db/models/fields/__init__.py`\n  - Added a system check in `Field._check_choices()` to compute the longest string choice value and ra",
+        "last_stage": "solve",
+        "response.solve": "Implemented the Django fix for this issue.\n\nWhat changed:\n- `django/db/models/fields/__init__.py`\n  - Added a system check in `Field._check_choices()` to compute the longest string choice value and raise `fields.E009` when `max_length` is too small.\n  - Kept it safe for grouped choices with non-string values.\n- `tests/invalid_models_tests/test_ordinary_fields.py`\n  - Added regression tests for both flat and grouped `choices` where a choice value exceeds `max_length`.\n\nValidation:\n- `python -m pip install -e .`\n- `python tests/runtests.py invalid_models_tests.test_ordinary_fields --parallel 1`\n\nNotes:\n- The provided setup failed because the workspace wasn't empty, so I overlaid the Django source at the requested commit into the workspace before applying the fix."
+      },
+      "notes": "Stage completed: solve",
+      "usage": {
+        "model": "gpt-5.4",
+        "input_tokens": 1148939,
+        "output_tokens": 13772,
+        "cache_read_tokens": 1000064,
+        "reasoning_tokens": 6369,
+        "cost": 3.0789275000000003
+      },
+      "duration_ms": 312312
     }
   },
-  "next_node_id": "solve",
+  "next_node_id": "extract_patch",
   "loop_failure_signatures": {
     "setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.": 1
   },
   "node_visits": {
+    "solve": 1,
     "setup": 1,
     "start": 1
   }
diff --git a/nodes/solve/prompt.md b/nodes/solve/prompt.md
new file mode 100644
index 000000000..1ea72b51e
--- /dev/null
+++ b/nodes/solve/prompt.md
@@ -0,0 +1,28 @@
+Goal: Add check to ensure max_length fits longest choice.
+Description
+	
+There is currently no check to ensure that Field.max_length is large enough to fit the longest value in Field.choices.
+This would be very helpful as often this mistake is not noticed until an attempt is made to save a record with those values that are too long.
+
+
+## Completed stages
+- **setup**: fail
+  - Script: `git clone https://github.com/django/django.git . && git checkout fee75d2aed4e58ada6567c464cfd22e89dc65f4a && python -m pip install -e .`
+  - Stdout:
+    ```
+    fatal: destination path '.' already exists and is not an empty directory.
+    ```
+  - Stderr: (empty)
+
+## Context
+- failure_class: deterministic
+- failure_signature: setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.
+
+
+Fix this GitHub issue in the repository. Make the minimal code change needed.
+
+Add check to ensure max_length fits longest choice.
+Description
+	
+There is currently no check to ensure that Field.max_length is large enough to fit the longest value in Field.choices.
+This would be very helpful as often this mistake is not noticed until an attempt is made to save a record with those values that are too long.
diff --git a/nodes/solve/provider_used.json b/nodes/solve/provider_used.json
new file mode 100644
index 000000000..9f9e29e5d
--- /dev/null
+++ b/nodes/solve/provider_used.json
@@ -0,0 +1,5 @@
+{
+  "mode": "agent",
+  "provider": "openai",
+  "model": "gpt-5.4"
+}
\ No newline at end of file
diff --git a/nodes/solve/response.md b/nodes/solve/response.md
new file mode 100644
index 000000000..cefe4ccc3
--- /dev/null
+++ b/nodes/solve/response.md
@@ -0,0 +1,15 @@
+Implemented the Django fix for this issue.
+
+What changed:
+- `django/db/models/fields/__init__.py`
+  - Added a system check in `Field._check_choices()` to compute the longest string choice value and raise `fields.E009` when `max_length` is too small.
+  - Kept it safe for grouped choices with non-string values.
+- `tests/invalid_models_tests/test_ordinary_fields.py`
+  - Added regression tests for both flat and grouped `choices` where a choice value exceeds `max_length`.
+
+Validation:
+- `python -m pip install -e .`
+- `python tests/runtests.py invalid_models_tests.test_ordinary_fields --parallel 1`
+
+Notes:
+- The provided setup failed because the workspace wasn't empty, so I overlaid the Django source at the requested commit into the workspace before applying the fix.
\ No newline at end of file
diff --git a/nodes/solve/status.json b/nodes/solve/status.json
new file mode 100644
index 000000000..9c184fa6e
--- /dev/null
+++ b/nodes/solve/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": "Stage completed: solve",
+  "failure_reason": null,
+  "timestamp": "2026-03-16T05:38:01.774393+00:00"
+}
\ No newline at end of file