Using Coding Agents as World Brains

# Illustrative sketch (not from the paper)
import torch
# placeholder coding agent (GPT-5.6 Sol)
def coding_agent(event, world_state):
    # generate python code that updates world_state deterministically
    code = """
world_state['pos'] += world_state['vel']
if world_state['pos'] > 10:
    world_state['pos'] = 0
"""
    return code

# initial world state
world_state = {'pos': torch.tensor(0.), 'vel': torch.tensor(1.)}
event = "tick"

# coding agent produces update code
update_code = coding_agent(event, world_state)

# execute the generated code in a controlled namespace
exec(update_code, {}, {'world_state': world_state})

# deterministic compiler: produce proxy representation (e.g., position vector)
proxy = {'entity_pos': world_state['pos'].item()}

# placeholder video model (MiniMax-H3)
def video_model(proxy, description):
    # returns a dummy high‑fidelity frame tensor
    return torch.randn(3, 256, 256)  # mock image

frame = video_model(proxy, "simple world")
print("Generated frame shape:", frame.shape)

// Illustrative sketch (not from the paper)
const torch = require('torch-js'); // placeholder for tensor ops
// placeholder coding agent (GPT-5.6 Sol)
function codingAgent(event, worldState) {
  // returns a string of JS code that updates worldState
  return `
worldState.pos = worldState.pos + worldState.vel;
if (worldState.pos > 10) {
  worldState.pos = 0;
}
`;
}

// initial world state
let worldState = { pos: torch.tensor(0), vel: torch.tensor(1) };
let event = "tick";

// coding agent produces update code
let updateCode = codingAgent(event, worldState);

// evaluate the generated code in a sandboxed context
eval(updateCode);

// deterministic compiler: produce proxy representation
let proxy = { entityPos: worldState.pos.item() };

// placeholder video model (MiniMax-H3)
function videoModel(proxy, description) {
  // returns a dummy high‑fidelity frame tensor
  return torch.randn([3, 256, 256]); // mock image
}

let frame = videoModel(proxy, "simple world");
console.log("Generated frame shape:", frame.shape);