Opus 5.5 vs GPT-6 Astra: one prompt, Blender only, all procedural (X video)
Stefan 3D AI (@Stefan_3D_AI) · 2026-09-22 · ai-made · 469,945 views
Made by AI
Model: Claude Opus 5.5, GPT-6 Astra · Series: Agent-built game or 3D world (the video shows the result)
Evidence: X post (2026-09-22): 'One prompt, Blender only, all procedural... Opus 5.5: 35 min, 199.6k output tokens, about $13.3 in API terms. GPT-6 Astra: 28 min, 56.6k output tokens, about $14.5 in API terms.'
Human role: Same prompt to both; the models built and rendered in Blender and recorded their own build timelapses.
Pipeline: One prompt → each model drives Blender procedurally → 10-second render + build timelapse
What's in the video
Description written by Gemini, which watched and listened to the whole video.
Summary
This video showcases a side-by-side procedural 3D modeling comparison between Anthropic’s Claude Opus 5.5 and OpenAI’s GPT-6 Astra, created by Stefan 3D AI (@Stefan_3D_AI). Both frontier models were prompted to create a complete, fully procedural Disney-style fairytale castle intro with fireworks, water reflections, and animated text in Blender using only procedural scripting.
What is shown
- [00:00 – 00:09] Side-by-side split-screen comparison of the final procedural animations created by Claude Opus 5.5 (left) and GPT-6 Astra (right), both depicting an illuminated castle against mountains and starry night sky with fireworks arcing across the sky and title text ("STEFAN 3D AI") mirrored in the water.
- [00:10 – 00:14] Opus 5.5 viewport wireframe/solid clay breakdown showing progressive geometric creation of the foundation island, keep, spires, and side ramparts.
- [00:15 – 00:18] Opus 5.5 material and simulation pass, displaying blue conical roofs, lighting sources, stone materials, and particle emission trails for fireworks over a reflective water plane.
- [00:19 – 00:26] Full playback of Opus 5.5's final rendered sequence with cascading firework blossoms and the golden sparkling arc.
- [00:27 – 00:38] Progressive step-by-step assembly breakdown for GPT-6 Astra tracking 230 scripted steps, displaying milestones including:
008 / 230 Material: Lake cliffs | blue slate[00:27]028 / 230 Beveled edges: Keep belt course 8.5[00:28]048 / 230 Geometry: Western bell tower | roof seams and gold finial[00:29]088 / 230 Geometry: East outer tower | cornices and stone courses[00:31]148 / 230 Geometry: Gatehouse | open vaulted portal[00:34]168 / 230 Geometry: Bridge | paved deck[00:35]188 / 230 Light: Moon | broad cool key[00:36]208 / 230 Firework 4 | editable velocity, drag, gravity and fading trails[00:37]228 / 230 Polish | fine procedural masonry and clean lake reflections[00:38]
- [00:39 – 00:45] Full final render playback of GPT-6 Astra's sequence with arching particle emitters, bursting shells, and ambient illumination.
Claims & numbers
- The entire scene generation is procedural and completed from a single prompt in Blender without third-party 3D models or external image assets ("one prompt, Blender only, all procedural").
- GPT-6 Astra structured its scene build into a 230-step procedural pipeline covering geometry, materials, lighting, and physics simulation parameters.
Notable quotes
- [00:28] "028 / 230 Beveled edges: Keep belt course 8.5"
- [00:37] "208 / 230 Firework 4 | editable velocity, drag, gravity and fading trails"
- [00:38] "228 / 230 Polish | fine procedural masonry and clean lake reflections"
Assessment
This is an independent technical demonstration evaluating the procedural Blender Python scripting capabilities of Claude Opus 5.5 against GPT-6 Astra. The assets and scenes shown are authentic Blender procedural renders, though presented via edited time-lapses and pre-rendered playback rather than an unedited real-time code-execution feed.
Lyrics & themes
- Instrumental: The video contains no spoken dialogue or vocal performance; it is accompanied by an instrumental musical score and ambient effects designed to match theatrical fairytale studio logos.
Lore & references
- Walt Disney Pictures Intro: The entire scene directly recreates the iconic Disney castle production logo (the Neuschwanstein/Cinderella-style silhouette, the circular arc of sparks tracing over the highest tower, and the glowing title floating over reflective water).
- Frontier Coding Competitions: Reflects the ongoing benchmark rivalry between OpenAI (GPT-6 Astra) and Anthropic (Claude Opus 5.5) in generating production-grade, multi-stage Python code for spatial 3D software packages like Blender.
Visual style & craft
- Visuals: Native 3D computer graphics rendered directly in Blender (Cycles/Eevee), combining solid untextured viewport previews, material shaders, and final lit compositions.
- Craft & Origin: The 3D geometry, shaders, lighting coordinates, and particle physics were procedurally generated by the respective AI models via Python code, while the comparison overlays, sequencing, and split-screen video editing were compiled by human creator Stefan 3D AI.
Described by gemini-3.8-flash on 2026-10-05 from the video's audio and frames.