Render Window — hero
camera + framing set up by the AI contestant
3D Viewport — red-ball User Persp
LOADING 3D VIEW
$0.08Cost
63sDuration
8Tool calls
9Turns
Blender 5.1.0MCP 1.22026-07-15
Tokens: 89750/3632Vision: ✓Votes W-L-T: 0-0-0NO DONE
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…
03:29>>execute_blender_code({"code":"\nimport bpy\n\n# Clear existing scene\nbpy.ops.object.select_all(action='SELECT')\nbpy.ops.object.delete(use_global=False)\n\n# Remove orphan meshes/materials\nfor block in bpy.data.meshes:\n if block.users == 0:\n bpy.data.meshes.remove(block)\nfor block in bpy.data.materials:\n if block.users == 0:\n bpy.data.materials.remove(block)\n\n# Add ground plane\nbpy.ops.me…)
03:29<<Code executed successfully: Ground and Ball created
03:36>>execute_blender_code({"code":"\nimport bpy\n\n# Create red material for ball with slight glossiness\nmat_red = bpy.data.materials.new(name=\"RedMaterial\")\nmat_red.use_nodes = True\nbsdf = mat_red.node_tree.nodes[\"Principled BSDF\"]\nbsdf.inputs[\"Base Color\"].default_value = (0.8, 0.02, 0.02, 1.0)\nbsdf.inputs[\"Roughness\"].default_value = 0.25\n# Slight sheen/specular for glossiness highlight\nif \"Specular IOR …)
03:36<<Code executed successfully: Materials applied
03:45>>execute_blender_code({"code":"\nimport bpy\nimport math\n\n# Add camera\ncam_data = bpy.data.cameras.new(\"Camera\")\ncam_obj = bpy.data.objects.new(\"Camera\", cam_data)\nbpy.context.collection.objects.link(cam_obj)\nbpy.context.scene.camera = cam_obj\n\n# Position camera to frame the ball nicely - slightly elevated, looking down a bit\ncam_obj.location = (2.2, -2.5, 1.4)\n# Point camera at the ball (0,0,0.5)\ndirect…)
03:45<<Code executed successfully: Camera and lights set up
03:48>>get_viewport_screenshot({"max_size":1000,"user_prompt":"Check the current state of the scene"})
03:50<<
03:50imgimage delivered — get_viewport_screenshot
03:56>>execute_blender_code({"code":"\nimport bpy\n\n# Switch viewport shading to material preview to see materials/colors\nfor area in bpy.context.screen.areas:\n if area.type == 'VIEW_3D':\n for space in area.spaces:\n if space.type == 'VIEW_3D':\n space.shading.type = 'MATERIAL_PREVIEW'\n\n# Set render engine to Cycles for better quality shadows/glossiness\nbpy.context.scene.render.engi…)
03:56<<Error executing code: Communication error with Blender: Code execution error: bpy_struct: item.attr = val: enum "MATERIAL_PREVIEW" not found in ('WIREFRAME', 'SOLID', 'MATERIAL', 'RENDERED')
04:01>>execute_blender_code({"code":"\nimport bpy\n\nfor area in bpy.context.screen.areas:\n if area.type == 'VIEW_3D':\n for space in area.spaces:\n if space.type == 'VIEW_3D':\n space.shading.type = 'MATERIAL'\n\nbpy.context.scene.render.engine = 'CYCLES'\nbpy.context.scene.cycles.samples = 128\nbpy.context.scene.cycles.use_denoising = True\n\nprint(\"Done\")\n","user_prompt":"Switch to …)
04:01<<Code executed successfully: Done
04:04>>get_viewport_screenshot({"max_size":1000,"user_prompt":"Check materials are showing"})
04:05<<
04:06imgimage delivered — get_viewport_screenshot
04:11ai>Materials look good. Now let's view through the camera to check framing and composition.
04:11>>execute_blender_code({"code":"\nimport bpy\n\n# Switch to camera view\nfor area in bpy.context.screen.areas:\n if area.type == 'VIEW_3D':\n for space in area.spaces:\n if space.type == 'VIEW_3D':\n override = bpy.context.copy()\n override['area'] = area\n with bpy.context.temp_override(**override):\n bpy.ops.view3d.view_camera()\n\npr…)
04:11<<Error executing code: Communication error with Blender: Code execution error: Operator bpy.ops.view3d.view_camera.poll() failed, context is incorrect
04:16--status: budget_exhausted
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