---
title: "Jev Router plays Grow a city (seed 6) | Micropolis run | Evals by Jetty"
url: https://evaljetty.com/micropolis/runs/jev-grow-s6.html
description: "Jev Router as mayor in Micropolis, Grow a city: 4,580 people, city score 367. Timelapse, charts, every decision and the run's evaluation."
updated: 2026-09-28
publisher: Jetty (https://jetty.io)
---

02 — Run · Round 1 · Grow a city · jev-grow-s6

# Jev Router plays Grow a city

Empty generated map, $20,000, 20 years: reach 10,000 people without going bankrupt. Ended Jan 1920: 4,580 people, city score 367.

The model used its 45-minute budget by turn 63; the city ran on untouched from there to the deadline.

[Decision log](https://evaljetty.com/micropolis/runs/jev-grow-s6/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/jev-grow-s6/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/jev-grow-s6/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/jev-grow-s6/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/jev-grow-s6/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/jev-grow-s6/validation_report.json)

GOAL MISSED seed 6

Jev Router

typesafe/jev-router

population 4,580 (goal 10,000), city score 367

Population (start → end)0 → 4,580
Peak population24,600City score (start → end)500 → 367
Funds at the end$2,534Crime / pollution / traffic43 / 72 / 12
Zones R / C / I77 / 23 / 33
Power plants (coal / nuclear)3 / 0Police / fire stations1 / 1
Turns (model / failed)80 (62 / 12)
Actions applied / rejected167 / 3
Mean turn latency44.8sModel cost$1.911Wall clock46.6 min
Jetty run ID981094de

## The city over time

### Population

People, after every turn

### Funds

Treasury, after every turn

### City score

0–1000, re-evaluated each January

Table view

| Turn | Date | Population | Funds | City score | Crime | Pollution |
| --- | --- | --- | --- | --- | --- | --- |
| 0 | Jan 1900 | 0 | $20,000 | 500 | 0 | 0 |
| 1 | Apr 1900 | 160 | $10,445 | 712 | 0 | 0 |
| 2 | Jul 1900 | 680 | $9,596 | 712 | 44 | 45 |
| 3 | Oct 1900 | 1,420 | $9,381 | 712 | 25 | 46 |
| 4 | Jan 1901 | 2,980 | $5,120 | 601 | 25 | 46 |
| 5 | Apr 1901 | 4,220 | $5,120 | 601 | 27 | 56 |
| 6 | Jul 1901 | 5,860 | $5,120 | 601 | 47 | 66 |
| 7 | Oct 1901 | 8,540 | $1,596 | 601 | 47 | 66 |
| 8 | Jan 1902 | 10,460 | $1,304 | 557 | 58 | 61 |
| 9 | Apr 1902 | 12,220 | $562 | 557 | 84 | 58 |
| 10 | Jul 1902 | 15,120 | $562 | 557 | 84 | 60 |
| 11 | Oct 1902 | 17,120 | $49 | 557 | 102 | 60 |
| 12 | Jan 1903 | 19,620 | $1,205 | 359 | 117 | 58 |
| 13 | Apr 1903 | 20,520 | $587 | 359 | 117 | 59 |
| 14 | Jul 1903 | 21,120 | $587 | 359 | 126 | 59 |
| 15 | Oct 1903 | 20,980 | $177 | 359 | 134 | 67 |
| 16 | Jan 1904 | 21,120 | $1,108 | 307 | 134 | 66 |
| 17 | Apr 1904 | 20,840 | $1,108 | 307 | 146 | 63 |
| 18 | Jul 1904 | 19,200 | $1,008 | 307 | 138 | 63 |
| 19 | Oct 1904 | 17,680 | $1,008 | 307 | 138 | 55 |
| 20 | Jan 1905 | 16,100 | $2,202 | 225 | 128 | 59 |
| 21 | Apr 1905 | 14,280 | $2,202 | 225 | 115 | 59 |
| 22 | Jul 1905 | 13,240 | $2,202 | 225 | 115 | 56 |
| 23 | Oct 1905 | 12,420 | $2,202 | 225 | 106 | 59 |
| 24 | Jan 1906 | 10,260 | $3,057 | 194 | 86 | 59 |
| 25 | Apr 1906 | 9,160 | $55 | 194 | 86 | 60 |
| 26 | Jul 1906 | 8,660 | $55 | 194 | 75 | 66 |
| 27 | Oct 1906 | 7,760 | $55 | 194 | 70 | 63 |
| 28 | Jan 1907 | 7,220 | $525 | 209 | 70 | 63 |
| 29 | Apr 1907 | 6,660 | $525 | 209 | 65 | 57 |
| 30 | Jul 1907 | 5,580 | $525 | 209 | 58 | 65 |
| 31 | Oct 1907 | 5,360 | $525 | 209 | 58 | 65 |
| 32 | Jan 1908 | 5,100 | $435 | 271 | 52 | 74 |
| 33 | Apr 1908 | 4,860 | $435 | 271 | 49 | 69 |
| 34 | Jul 1908 | 4,380 | $435 | 271 | 49 | 72 |
| 35 | Oct 1908 | 4,200 | $435 | 271 | 48 | 72 |
| 36 | Jan 1909 | 4,000 | $592 | 318 | 46 | 69 |
| 37 | Apr 1909 | 3,280 | $592 | 318 | 46 | 70 |
| 38 | Jul 1909 | 3,140 | $592 | 318 | 46 | 70 |
| 39 | Oct 1909 | 3,200 | $592 | 318 | 39 | 64 |
| 40 | Jan 1910 | 3,060 | $719 | 340 | 39 | 65 |
| 41 | Apr 1910 | 3,680 | $719 | 340 | 36 | 65 |
| 42 | Jul 1910 | 6,460 | $719 | 340 | 40 | 66 |
| 43 | Oct 1910 | 8,880 | $587 | 340 | 40 | 46 |
| 44 | Jan 1911 | 12,500 | $1,061 | 482 | 57 | 60 |
| 45 | Apr 1911 | 14,720 | $642 | 482 | 86 | 60 |
| 46 | Jul 1911 | 17,080 | $642 | 482 | 86 | 61 |
| 47 | Oct 1911 | 19,320 | $642 | 482 | 105 | 63 |
| 48 | Jan 1912 | 21,000 | $1,328 | 453 | 123 | 63 |
| 49 | Apr 1912 | 22,980 | $993 | 453 | 123 | 61 |
| 50 | Jul 1912 | 24,600 | $993 | 453 | 134 | 66 |
| 51 | Oct 1912 | 23,800 | $382 | 453 | 142 | 68 |
| 52 | Jan 1913 | 23,960 | $994 | 455 | 142 | 68 |
| 53 | Apr 1913 | 23,800 | $540 | 455 | 134 | 68 |
| 54 | Jul 1913 | 23,680 | $318 | 455 | 128 | 64 |
| 55 | Oct 1913 | 23,440 | $102 | 455 | 128 | 64 |
| 56 | Jan 1914 | 22,460 | $754 | 450 | 119 | 71 |
| 57 | Apr 1914 | 20,980 | $754 | 450 | 121 | 70 |
| 58 | Jul 1914 | 19,700 | $754 | 450 | 121 | 70 |
| 59 | Oct 1914 | 18,540 | $754 | 450 | 113 | 75 |
| 60 | Jan 1915 | 17,840 | $2,428 | 351 | 98 | 72 |
| 61 | Apr 1915 | 16,660 | $2,245 | 351 | 98 | 80 |
| 62 | Jul 1915 | 15,220 | $2,245 | 351 | 93 | 80 |
| 63 | Oct 1915 | 14,520 | $2,245 | 351 | 85 | 80 |
| 64 | Jan 1916 | 13,020 | $2,510 | 335 | 85 | 79 |
| 65 | Apr 1916 | 12,020 | $2,510 | 335 | 82 | 79 |
| 66 | Jul 1916 | 10,240 | $2,510 | 335 | 75 | 85 |
| 67 | Oct 1916 | 9,240 | $2,510 | 335 | 75 | 75 |
| 68 | Jan 1917 | 7,840 | $2,577 | 302 | 66 | 86 |
| 69 | Apr 1917 | 7,060 | $2,577 | 302 | 59 | 86 |
| 70 | Jul 1917 | 6,800 | $2,577 | 302 | 59 | 78 |
| 71 | Oct 1917 | 6,800 | $2,577 | 302 | 54 | 68 |
| 72 | Jan 1918 | 6,480 | $2,599 | 361 | 53 | 68 |
| 73 | Apr 1918 | 6,380 | $2,599 | 361 | 53 | 69 |
| 74 | Jul 1918 | 5,920 | $2,599 | 361 | 51 | 73 |
| 75 | Oct 1918 | 5,420 | $2,599 | 361 | 49 | 73 |
| 76 | Jan 1919 | 5,720 | $2,588 | 398 | 49 | 72 |
| 77 | Apr 1919 | 5,460 | $2,588 | 398 | 46 | 75 |
| 78 | Jul 1919 | 5,340 | $2,588 | 398 | 45 | 72 |
| 79 | Oct 1919 | 4,980 | $2,588 | 398 | 45 | 72 |
| 80 | Jan 1920 | 4,580 | $2,534 | 367 | 43 | 72 |

## Final map

[![Final city map: Jev Router on Grow a city](https://evaljetty.com/micropolis/media/jev-grow-s6-map.jpg)](https://evaljetty.com/micropolis/runs/jev-grow-s6/final_map.png)

## Evaluation

failchecks **9/10** verdict: valid run (code checks and checklist) and task goal met (judge)

| Status | Kind | Check | Detail |
| --- | --- | --- | --- |
| pass | step | environment | Environment check (snapshot, engine, key) |
| pass | step | launch | Launch run-city as a detached process |
| pass | step | supervise | Supervise in the foreground until run-city exits |
| pass | step | render | Timelapse video rendered |
| pass | step | notes | Append Notes to summary.md |
| pass | code\_check | outputs-exist | all present |
| pass | code\_check | sim-reached-deadline | ended Jan 1920 after 80 turns; scenario verdict None |
| pass | code\_check | decisions-logged | 80 rows for 80 turns |
| pass | code\_check | llm-turns-valid | 12/62 model turns failed |
| pass | code\_check | video-decodes | duration 35.6s |
| pass | code\_check | limits-respected | 46.6 wall-minutes (model budget 45.0 min) |
| fail | judge | city-goal | population 4,580 (goal 10,000), city score 367 (score 4,580 / threshold 10,000) |
| pass | checklist | notes-explain-outcome | Notes section cites model thoughts from turns 1, 11, and 61, explains the population rollercoaster and why the goal was not met |
| pass | checklist | player-matches-request | result.json shows player jev, task grow, seed 6 as requested |
| pass | checklist | no-silent-outage | run.log shows no long silent stretch; all failures are logged per-turn with timing and cost; retry used for first run 21/45 failures |

## Decision timeline

What the mayor thought and did each turn. Click a turn to jump the timelapse there.

---
Source: https://evaljetty.com/micropolis/runs/jev-grow-s6.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms