Opus 5.5 recreates San Francisco in Unreal Engine, with everything powered by Jev (Matthew Berman, X video)
Matthew Berman (@MatthewBerman) · 2026-09-22 · ai-made · 372,581 views
Made by AI
Model: Claude Opus 5.5, Jev · Series: Agent-built game or 3D world (the video shows the result)
Evidence: X post (2026-09-22): 'I had Opus 5.5 recreate the city of San Francisco in Unreal Engine. / I powered everything in it (people, pets, cars, traffic, literally everything) with Jev.'
Human role: Creator had Opus 5.5 build the city; people, pets, cars and traffic run on Jev.
Pipeline: Opus 5.5 → Unreal Engine scene + Jev agents → 54-second flyover
What's in the video
Description written by Gemini, which watched and listened to the whole video.
Summary This video presents a 3D digital simulation flythrough recreating downtown San Francisco inside Unreal Engine, reportedly generated/assembled with Claude Opus 5.5 and running behaviors powered by TypeSafe AI's Jev model, shared by Matthew Berman. The capture starts at an urban street intersection with moving traffic and pedestrians before pulling out to a panoramic high-altitude view of the entire city skyline, San Francisco Bay, and regional landmarks.
What is shown
- [00:00–00:12]: A street-level perspective of a San Francisco intersection (along Market Street) showing tram tracks, traffic signals, moving cars, a van, groups of pedestrian NPCs on brick sidewalks, and trees, with an Unreal Engine 3D viewport coordinate widget visible in the bottom-left corner.
- [00:13–00:18]: A vertical camera ascension looking down between office skyscrapers and along the street canyon.
- [00:19–00:26]: A wide aerial view revealing the downtown financial district, including landmarks like the Salesforce Tower, Transamerica Pyramid, the Embarcadero waterfront, the San Francisco–Oakland Bay Bridge, and Treasure Island.
- [00:27–00:46]: An aerial orbit over the city grid showing the dense urban architecture, Alcatraz Island in the bay, and the Golden Gate Bridge leading to the Marin Headlands in the background.
- [00:47–00:53]: A camera repositioning looking across the mid-rise buildings and residential grid towards the Pacific ocean and northern strait.
Claims & numbers
- None (no spoken audio, titles, or on-screen performance benchmarks appear in the video clip).
Notable quotes
- None (the video contains no spoken dialogue or narration).
Assessment This is a direct screen-capture demonstration of a real-time 3D environment rendered within a game engine (Unreal Engine), evidenced by the coordinate axis gizmo in the bottom left. The visual output is a polygonal 3D reconstruction rather than a video diffusion model output, demonstrating procedural city modeling, layout placement, and autonomous vehicle/NPC pathing.
Lyrics & themes
- The video is completely instrumental/silent without any lyrics, narration, or sung vocals.
Lore & references
- San Francisco: The chosen simulation environment is San Francisco, California, the epicenter of the AI boom and home to frontier AI labs like Anthropic and OpenAI.
- Iconic Landmarks: Accurately places key San Francisco topography and architecture, including the Transamerica Pyramid, Salesforce Tower, the Bay Bridge, and the Golden Gate Bridge.
- Agentic Engine Generation: Connects to the trend of large language models (such as Claude Opus 5.5) orchestrating 3D game engines and interfacing with specialized decision models (Jev) to populate interactive world environments with autonomous agents and vehicles.
Visual style & craft
- The visuals are rendered in a real-time 3D game engine (Unreal Engine viewport) rather than being generated frame-by-frame by a video foundation model.
- Assets feature clean, slightly simplified geometric 3D models with baked textures, procedural traffic and crowd behavior, realistic sun positioning, and a standard camera path controller moving from ground level up to macro city-scale vistas.
Described by gemini-3.8-flash on 2026-10-05 from the video's audio and frames.