Render Window — hero
camera + framing set up by the AI contestant
3D Viewport — red-ball User Persp
LOADING 3D VIEW
$0.07Cost
94sDuration
5Tool calls
6Turns
Blender 5.1.0MCP 1.22026-07-15
Tokens: 54024/3661Vision: ✗Votes W-L-T: 0-0-0DONE ✓
B-BENCH — TRANSCRIPT Anthropic / Sonnet 5 · r1 · 2026-07-15
RUN LOG — red-ball · Anthropic / Sonnet 5 · r1 · ok
SYSTEM PROMPTthe control — every model on this task got these instructions
PROMPTblender-bench v6HARNESSraw-v1
SHOW FULL PROMPT · 1104 chars
You are participating in Blender-Bench, a public benchmark where AI models complete the same Blender task. Your result will be compared head-to-head with another model. Anyone on the internet can vote, based only on the published visual outputs they can inspect: the interactive 3D scene and rendered presentation. Complete the request as well as you can. The benchmark does not prescribe a workflow or visual style; use whichever Blender techniques you consider appropriate. Make the important requirements evident in the published result, save a complete scene, and present the work clearly in every requested output. ## Harness Instructions You are operating Blender through the provided tools. The scene starts empty. Build what the user's prompt asks for in the current scene. Work step by step and verify your own work. Before you finish, set up a camera and lighting to frame a single, well-composed presentation image of your result — position and aim the camera, and add or adjust lights so the subject reads clearly. When you are finished, reply with the single word DONE and no tool calls.
--TASK red-ball: ## Task
Complete the following Blender task:
<task>
A red sphere of 1 meter diameter resting on a white ground plane — touching it
exactly, neither floating nor sunk. Smooth shading, a plain red material on the
ball, plain white on the floor.
The floor is the sphere, the color, and the contact. The ceiling is presentation:
a soft believable shadow under the ball, a hint of glossiness that catc…
04:41>>execute_blender_code({"code":"\nimport bpy\nimport math\n\n# --- Clear scene ---\nbpy.ops.object.select_all(action='SELECT')\nbpy.ops.object.delete(use_global=False)\n\n# remove default data blocks that might linger (materials, meshes)\nfor block in list(bpy.data.meshes):\n if block.users == 0:\n bpy.data.meshes.remove(block)\nfor block in list(bpy.data.materials):\n if block.users == 0:\n bpy.data…)
04:42<<Code executed successfully: Ground and sphere created: GroundPlane RedSphere
04:52>>execute_blender_code({"code":"\nimport bpy\nimport math\nfrom mathutils import Vector\n\nscene = bpy.context.scene\n\n# --- Camera ---\ncam_data = bpy.data.cameras.new(\"Camera\")\ncam_obj = bpy.data.objects.new(\"Camera\", cam_data)\nscene.collection.objects.link(cam_obj)\nscene.camera = cam_obj\n\ncam_obj.location = (2.6, -2.6, 1.4)\ncam_data.lens = 60\n\n# Point camera at the sphere center (slightly above ground)\n…)
04:52<<Code executed successfully: Camera and lights set up
04:56>>get_scene_info({"user_prompt":"Verify scene setup for red sphere on white ground plane"})
04:56<<{
"name": "Scene",
"object_count": 6,
"objects": [
{
"name": "Camera",
"type": "CAMERA",
"location": [
2.6,
-2.6,
1.4
]
},
{
"name": "KeyLight",
"type": "LIGHT",
"location": [
3.0,
-2.0,
3.5
]
},
{
"name": "FillLight",
"type": "LIGHT",
"location": [
-3…
05:00ai>Scene looks correct: sphere resting exactly at z=0.5 (radius 0.5, so bottom touches ground at z=0), materials assigned, camera and three-point lighting set up. Let me render a quick preview to confirm framing and shadow look good.
05:00>>execute_blender_code({"code":"\nimport bpy\n\nscene = bpy.context.scene\nscene.render.filepath = \"/tmp/preview_render.png\"\nbpy.ops.render.render(write_still=True)\nprint(\"Rendered to\", scene.render.filepath)\n"})
05:39<<Code executed successfully: Rendered to /tmp/preview_render.png
05:43>>get_object_info({"object_name":"RedSphere","user_prompt":"Verify sphere dimensions and position for exact contact with ground"})
05:43<<{
"name": "RedSphere",
"type": "MESH",
"location": [
0.0,
0.0,
0.5
],
"rotation": [
0.0,
0.0,
0.0
],
"scale": [
1.0,
1.0,
1.0
],
"visible": true,
"materials": [
"RedBall"
],
"world_bounding_box": [
[
-0.49999985098838806,
-0.49999988079071045,
0.0
],
[
0.4999999403953552,
0.5,
1.0
]
…
05:49ai>Confirmed: the sphere's bounding box spans from z=0.0 to z=1.0 — exactly 1 meter diameter, touching the ground plane (z=0) precisely without floating or sinking.
The scene is complete:
- **Red sphere**: 1m diameter (radius 0.5), centered at z=0.5, smooth-shaded, plain red Principled BSDF material with moderate roughness for a subtle glossy highlight.
- **White ground plane**: large flat plane at …
05:49--status: ok · DONE declared
>
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