GLM 5.3 and GLM 5.3 Flash ran locally on RTX PRO 6000 WS and built a penthouse using BlenderMCP

I keep seeing demos of AI agents building scenes in Blender through BlenderMCP, so I tried it myself. I ran both models locally for this and picked the GLM 5.3 family(Q4 quant) because videos of it doing 3D work kept showing up in my twitter feed (out of curiosity, I ran the same prompt through the full GLM 5.3, also locally with a Q4 quant) these aren't small models, obviously, a 4-bit quantized Flash is around 190-200GB + headroom for context. full GLM 5.3 is around 450-470GB at 4-bit quantization (basically I went with the Q4 quants for both and the RTX PRO 6000 WS GPU, though I had to rent 4x rtx pro 6000ws for the flash model and 6x for the base one) writing the prompt wasn't as easy as I thought. my first attempts were vague and mostly produced 3D goo instead of an actual room. I eventually started specifying real dimensions: ceiling heights, stair rise, window mullion spacing and so on(the camera work was separately done by claude opus 5 so that I wouldn't have my token stats inflated by it) prompt model a luxury duplex penthouse in the open Blender session. footprint 20.0 x 13.0 m (260 sqm). main ceiling 2.9 m. a double-height volume 9.0 x 8.0 m rising to 6.2 m. mezzanine floor at 3.1 m with a 1.1 m balustrade. stair: 17 treads, rise 0.182, going 0.28. terrace 20.0 x 4.5 m at Z = -0.02 with a 1.15 m balustrade. curtain wall with mullions every 1.5 m, frame depth 0.06. doors 2.10 m. counters 0.90 m. dining table 0.74 m. sofa seat 0.42 m. materials, PBR ranges: glass IOR 1.45-1.52, transmission 1.0; concrete roughness 0.25-0.40; marble roughness 0.08-0.15; brushed metal metallic 1.0, roughness 0.25-0.35; fabric roughness 0.75-0.95. reference real penthouses for proportion. furnish it. do NOT add a camera. do not reset the session. at first it was putting up the curtain wall, stairs, mezzanine, the glass railing, all that, then at some point I noticed it had furnished the place too with some furniture: sofa, dining table and plates on it. the pendant lights were hanging from these 4 m cords, and for some reason it had modeled the individual spines on the books, which I never asked for the video only follows the camera through the living space, so the terrace and facade aren't visible(the clip is repurposed from another video I made with the same scene, I didn't render a new one because that takes quite some time) stats metric Flash GLM 5.3 objects 811 847 turns 43 42 tool errors 9 8 thinking before 1st object 10s 21m 55s time 38m 52s 40m 43s output tokens 36K 112K GLM 5.3 spent 22 minutes thinking(82k tokens), before placing any objects(as well as producing 36 more objects than GLM 5.3 Flash and consuming 3x times the output tokens), meanwhile GLM 5.3 Flash got to work almost immediately I measured both scenes afterwards by raycasting upward from the floor and checking the rooms against the brie. Flash got the double-height void right at 9 x 8 m. the full model built it at 9 x 4.5 m but reported it as 9 x 8 m This is obviously just an experiment, not a benchmark. Flash came surprisingly close on object count and total time while using less than one-third as many output tokens. it also got the main room dimensions right when the full model didn't if you want to try the same Blender setup, I used the community BlenderMCP project I'm a founder of atomic.chat , we have an app for running local models and our own quants(any feedback is appreciated, we're trying to make our products as good as possible for you guys)