~ same prompt, different LLM — every model gets the same brief in Blender, you judge the render ~
OpenAI / GPT 6 Astra / thinking:max has entered the arena NEW!
Render Window — hero
hero render
auto-framed by the bench — contestant set no camera
3D Viewport — punched-cube User Persp
LOADING 3D VIEW
$0.01Cost
263sDuration
10Tool calls
11Turns
Blender 5.1.0MCP 1.0.02026-07-31
Tokens: 84550/13604Vision: Votes W-L-T: 0-4-2reasoning: effort maxNO DONE
B-BENCH — TRANSCRIPT OpenAI / GPT 5.6 Luna / thinking:max · r1 · 2026-07-31
RUN LOG — punched-cube · OpenAI / GPT 5.6 Luna / thinking:max · r1 · ok
SYSTEM PROMPTthe control — every model on this task got these instructions
PROMPTblender-bench v8HARNESSraw-v3
SHOW FULL PROMPT · 3364 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 on two equally important published views: a 2D rendered presentation and an interactive 3D scene exported to GLB. Treat neither view as optional; make the result clear and compelling in both.

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.

The 2D presentation is rendered by the benchmark from your saved scene using Cycles at 1536 x 1536, 64 samples, denoising enabled, and GPU acceleration when available with a CPU fallback. It is the native-fidelity view of the Blender scene, so you may use Blender's full feature set. Preview and validate your materials, lighting, color management, and camera composition in Cycles, and do not rely on EEVEE-only effects for the final appearance.

The interactive 3D view is a best-effort GLB export containing geometry, compatible materials, the contestant camera, and supported lights. Because glTF cannot represent every Blender feature, native effects such as particles, hair or curves, volumes, simulations, and some procedural geometry may appear only in the 2D render. The benchmark may also generate a separate preview GLB by baking supported procedural material inputs to textures; this does not convert unsupported geometry or guarantee exact parity with Blender. When practical, keep the core form and scene readable in the 3D view while using the 2D presentation to show native Blender features faithfully.

## Harness Instructions

You are operating Blender through the provided tools. Tool calls execute one at a time, in the order you issue them, against a single live Blender instance — each call sees the state left by the previous one, and issuing several calls in one message gains no parallelism. 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.

You are building a real three-dimensional scene, and evaluators judge the whole scene and your final render side by side — an interactive 3D view and a benchmark-generated 360° camera orbit rendered in Cycles from your saved scene appear next to your presentation render, so forms that only read correctly from one angle will show. Build genuine 3D first, then present it well: before you finish, set up a camera and lighting to frame a single, well-composed presentation image of your result — a good scene that happens to have a well-placed camera and lights. The final benchmark capture overrides the scene render settings and renders in Cycles at 1536x1536, 64 samples, with denoising and GPU acceleration (CPU fallback). Preview and validate materials, lighting, color management, and composition in Cycles; do not rely on EEVEE-only effects. Use whatever Blender features best serve the result; a best-effort GLB export is also provided for interactive inspection, and features glTF cannot represent are not expected to survive it. When you are finished, reply with the single word DONE and no tool calls.
--TASK punched-cube: ## Task Complete the following Blender task: <task> A 2-meter cube at the world origin with a round hole punched straight through it: a cylinder of 1 meter diameter, centered, running clean through the top and bottom faces. Apply the boolean so the result is a single mesh with an open channel — the camera can see straight through the cube. The floor is the hole. The ceiling is the finish: a sm…
29:36>>execute_blender_code({"code":"import bpy, math, mathutils\nfrom mathutils import Vector\n\n# Clear the starter scene completely.\nbpy.ops.object.select_all(action='SELECT')\nbpy.ops.object.delete(use_global=False)\nfor datablocks in (bpy.data.meshes, bpy.data.curves, bpy.data.materials, bpy.data.cameras, bpy.data.lights):\n # Keep datablock removal conservative; only purge unused datablocks created by the empty sta…)
29:57<<Error executing tool execute_blender_code: Blender connection timed out at localhost:9876
29:59>>execute_blender_code({"code":"import bpy\nresult={'filepath':bpy.data.filepath,'objects':[o.name for o in bpy.context.scene.objects],'count':len(bpy.context.scene.objects)}"})
30:00<<{ "status": "ok", "result": { "filepath": "", "objects": [], "count": 0 } }
30:18>>execute_blender_code({"code":"import bpy, math\n# Clear all objects.\nbpy.ops.object.select_all(action='SELECT')\nbpy.ops.object.delete(use_global=False)\n# Remove any leftover modifiers via objects gone; construct body.\nbpy.ops.mesh.primitive_cube_add(size=2.0, location=(0.0,0.0,0.0))\nbody=bpy.context.object\nbody.name='Cube_2m_Through_Channel'\nbody.data.name='Cube_2m_Through_Channel_Mesh'\n# Explicitly apply base…)
30:19<<{ "status": "ok", "result": { "body": "Cube_2m_Through_Channel", "verts": 200, "polys": 104, "dims": [ 2.0, 2.0, 2.0 ], "objects": [ "Cube_2m_Through_Channel" ] } }
30:23>>execute_blender_code({"code":"import bpy, math\nbody=bpy.data.objects.get('Cube_2m_Through_Channel')\n# material\nmat=bpy.data.materials.new('Pleasant Deep Teal – Single Finish')\nmat.use_nodes=True\nbsdf=mat.node_tree.nodes.get('Principled BSDF')\nbsdf.inputs['Base Color'].default_value=(0.045,0.26,0.32,1)\nbsdf.inputs['Metallic'].default_value=0.05\nbsdf.inputs['Roughness'].default_value=0.28\nif 'Specular IOR Level…)
30:23<<{ "status": "error", "message": "Traceback (most recent call last):\n File \"<repo>\\.runner\\blender-mcp-v1.0.0\\addon\\mcp_to_blender_server.py\", line 230, in _execute_code\n exec(code, namespace)\n ~~~~^^^^^^^^^^^^^^^^^\n File \"<string>\", line 39, in <module>\nAttributeError: 'NoneType' object has no attribute 'name'\n" }
30:27>>execute_blender_code({"code":"import bpy\nbody=bpy.data.objects.get('Cube_2m_Through_Channel')\nresult={'exists':bool(body),'mods':[m.name for m in body.modifiers] if body else [],'slots':[m.name if m else None for m in body.data.materials] if body else [],'smooth_count':sum(1 for p in body.data.polygons if p.use_smooth) if body else None,'verts':len(body.data.vertices) if body else None}"})
30:27<<{ "status": "ok", "result": { "exists": true, "mods": [], "slots": [ null, "Pleasant Deep Teal – Single Finish" ], "smooth_count": 1016, "verts": 1112 } }
30:57>>execute_blender_code({"code":"import bpy, math\nfrom mathutils import Vector\nscene=bpy.context.scene\nbody=bpy.data.objects['Cube_2m_Through_Channel']\n\n# Normalize the single finish material slot after the applied modeling operations.\nmat=bpy.data.materials.get('Pleasant Deep Teal – Single Finish')\nif mat is None:\n mat=bpy.data.materials.new('Pleasant Deep Teal – Single Finish')\n mat.use_nodes=True\n b…)
31:18<<Error executing tool execute_blender_code: Blender connection timed out at localhost:9876
31:20>>execute_blender_code({"code":"import bpy\nscene=bpy.context.scene\nresult={'filepath':bpy.data.filepath,'objects':[(o.name,o.type) for o in scene.objects],'body':bpy.data.objects.get('Cube_2m_Through_Channel').name if bpy.data.objects.get('Cube_2m_Through_Channel') else None,'camera':scene.camera.name if scene.camera else None,'engine':scene.render.engine}"})
31:20<<{ "status": "ok", "result": { "filepath": "", "objects": [ [ "Cube_2m_Through_Channel", "MESH" ] ], "body": "Cube_2m_Through_Channel", "camera": null, "engine": "BLENDER_EEVEE" } }
31:26>>execute_blender_code({"code":"import bpy\nbody=bpy.data.objects.get('Cube_2m_Through_Channel')\nresult={'dims':tuple(body.dimensions),'verts':len(body.data.vertices),'polys':len(body.data.polygons),'mats':[m.name if m else None for m in body.data.materials],'mods':[m.name for m in body.modifiers],'loc':tuple(body.location),'smooth':sum(p.use_smooth for p in body.data.polygons),'filepath':bpy.data.filepath}"})
31:47<<Error executing tool execute_blender_code: Blender connection timed out at localhost:9876
31:51>>execute_blender_code({"code":"import bpy\nresult={'ok':True,'n':len(bpy.data.objects)}"})
31:52<<{ "status": "ok", "result": { "ok": true, "n": 1 } }
31:55>>execute_blender_code({"code":"import bpy\nbody=bpy.data.objects.get('Cube_2m_Through_Channel')\nbody.data.materials.clear()\nmat=bpy.data.materials.get('Pleasant Deep Teal – Single Finish')\nif mat is None:\n mat=bpy.data.materials.new('Pleasant Deep Teal – Single Finish'); mat.use_nodes=True\n b=mat.node_tree.nodes.get('Principled BSDF'); b.inputs['Base Color'].default_value=(0.045,0.26,0.32,1); b.inputs['Rough…)
31:55<<{ "status": "ok", "result": { "mats": [ "Pleasant Deep Teal – Single Finish" ], "verts": 1112 } }
32:04--status: budget_exhausted
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Votes cast on this bench: 000482 · 157 runs · 25 contestants
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