Breaking

Grok 4.7 Demo Turns One Grok Build Prompt Into GTA-Style City Prototype

September 23, 2026 at 00:17 EDT

Software Dev & Coding
AI Agents
Foundation Models

SpaceXAI's Grok 4.7 is being tested in Grok Build as a one-prompt game-prototyping agent, after a public demo called Saltwharf showed a dusk 3D harbor city with walking, driving and vehicle entry. The clip is a narrow demo rather than a shipping game, but it gives developers a concrete example of why the new model is being positioned around longer-running coding and agentic work.

Sep. 21, 2026 · SpaceXAI

Grok 4.7 turns a prompt into a playable city prototype

A Saltwharf demo shows Grok Build producing a basic GTA-style 3D harbor city with walking and driving, while the model release points to stronger long-running coding performance.

prompt behind the demo claim

46.3%

CursorBench 4.0 score

500k

maximum context window

$2/$6

input and output per 1M tokens

Terminal-Bench 4.0 nearly doubles

Each stacked block represents about four percentage points.

20.3%

Grok 4.6

37.6%

Grok 4.7

How the demo story flows

Prompt

A single instruction starts the build.

→

Agent work

Grok Build produces the prototype.

→

Playable city

Users can walk, enter cars and drive.

Why developers care

The demo suggests faster interactive prototyping for game worlds, simulations and code-heavy creative mockups.

What remains open

The prompt was not disclosed, visuals remain basic, and long-context integrations still need real workflow testing.

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