---
title: "Claude Sonnet 5 plays Detroit 1972 (seed 1) | Micropolis run | Evals by Jetty"
url: https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1.html
description: "Claude Sonnet 5 as mayor in Micropolis, Detroit 1972: crime: lost, city score 586. Timelapse, charts, every decision and the run's evaluation."
updated: 2026-09-28
publisher: Jetty (https://jetty.io)
---

02 — Run · Round 1 · Detroit 1972: crime · sonnet5-detroit-s1

# Claude Sonnet 5 plays Detroit 1972

Detroit's crime is out of control in 1972. Bring average crime under 60 in 10 years, without emptying the city. Ended Jan 1982: lost, city score 586.

[Decision log](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1/validation_report.json)

GOAL MISSED seed 1

Claude Sonnet 5

anthropic/claude-sonnet-5

LOST: Average crime 30 (goal < 60), population 3,520 (floor 25,000); engine verdict: won

Population (start → end)76,160 → 3,520
Peak population76,160City score (start → end)285 → 586
Funds at the end$0Crime / pollution / traffic30 / 50 / 0
Zones R / C / I138 / 65 / 89
Power plants (coal / nuclear)2 / 3Police / fire stations13 / 7
Turns (model / failed)40 (40 / 0)
Actions applied / rejected118 / 36
Mean turn latency10.1sModel cost$0.730Wall clock6.9 min
Jetty run ID650b3bc0

## 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 1972 | 76,160 | $20,000 | 285 | 92 | 62 |
| 1 | Apr 1972 | 74,700 | $18,343 | 545 | 92 | 62 |
| 2 | Jul 1972 | 72,160 | $17,932 | 545 | 105 | 64 |
| 3 | Oct 1972 | 67,800 | $16,804 | 545 | 108 | 64 |
| 4 | Jan 1973 | 63,340 | $14,362 | 477 | 108 | 64 |
| 5 | Apr 1973 | 58,400 | $13,841 | 477 | 94 | 60 |
| 6 | Jul 1973 | 50,600 | $13,165 | 477 | 82 | 57 |
| 7 | Oct 1973 | 44,120 | $12,139 | 477 | 82 | 57 |
| 8 | Jan 1974 | 41,340 | $8,818 | 391 | 58 | 55 |
| 9 | Apr 1974 | 38,080 | $8,811 | 391 | 53 | 54 |
| 10 | Jul 1974 | 34,600 | $8,811 | 391 | 53 | 55 |
| 11 | Oct 1974 | 31,760 | $8,308 | 391 | 49 | 55 |
| 12 | Jan 1975 | 28,940 | $7,135 | 350 | 46 | 52 |
| 13 | Apr 1975 | 25,160 | $7,135 | 350 | 46 | 48 |
| 14 | Jul 1975 | 23,840 | $7,135 | 350 | 43 | 48 |
| 15 | Oct 1975 | 22,020 | $7,135 | 350 | 42 | 48 |
| 16 | Jan 1976 | 19,620 | $3,226 | 369 | 42 | 43 |
| 17 | Apr 1976 | 18,060 | $3,221 | 369 | 39 | 46 |
| 18 | Jul 1976 | 15,540 | $3,216 | 369 | 38 | 46 |
| 19 | Oct 1976 | 13,980 | $3,216 | 369 | 38 | 43 |
| 20 | Jan 1977 | 12,740 | $1,487 | 330 | 36 | 40 |
| 21 | Apr 1977 | 11,340 | $1,487 | 330 | 35 | 40 |
| 22 | Jul 1977 | 9,800 | $1,487 | 330 | 35 | 42 |
| 23 | Oct 1977 | 9,160 | $1,487 | 330 | 33 | 43 |
| 24 | Jan 1978 | 8,220 | $672 | 320 | 32 | 43 |
| 25 | Apr 1978 | 7,160 | $672 | 320 | 32 | 44 |
| 26 | Jul 1978 | 6,720 | $672 | 320 | 32 | 42 |
| 27 | Oct 1978 | 5,700 | $672 | 320 | 32 | 40 |
| 28 | Jan 1979 | 5,700 | $118 | 324 | 32 | 40 |
| 29 | Apr 1979 | 5,360 | $118 | 324 | 32 | 41 |
| 30 | Jul 1979 | 4,500 | $118 | 324 | 31 | 43 |
| 31 | Oct 1979 | 4,140 | $118 | 324 | 31 | 43 |
| 32 | Jan 1980 | 3,760 | $0 | 280 | 31 | 47 |
| 33 | Apr 1980 | 4,000 | $0 | 280 | 31 | 46 |
| 34 | Jul 1980 | 3,440 | $0 | 280 | 31 | 49 |
| 35 | Oct 1980 | 3,400 | $0 | 280 | 31 | 49 |
| 36 | Jan 1981 | 3,040 | $0 | 306 | 31 | 53 |
| 37 | Apr 1981 | 3,040 | $0 | 306 | 31 | 49 |
| 38 | Jul 1981 | 2,720 | $0 | 306 | 30 | 49 |
| 39 | Oct 1981 | 2,740 | $0 | 306 | 30 | 49 |
| 40 | Jan 1982 | 4,620 | $0 | 586 | 30 | 50 |

## Final map

[![Final city map: Claude Sonnet 5 on Detroit 1972: crime](https://evaljetty.com/micropolis/media/sonnet5-detroit-s1-map.jpg)](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1/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 1982 after 40 turns; scenario verdict True |
| pass | code\_check | decisions-logged | 40 rows for 40 turns |
| pass | code\_check | llm-turns-valid | 0/40 model turns failed |
| pass | code\_check | video-decodes | duration 36.9s |
| pass | code\_check | limits-respected | 6.9 wall-minutes (model budget 45.0 min) |
| fail | judge | scenario-goal | LOST: Average crime 30 (goal < 60), population 3,520 (floor 25,000); engine verdict: won (score 0 / threshold 1) |
| pass | checklist | notes-explain-outcome | summary.md Notes section cites model thoughts from turns 1, 28, and 40 and explains why crime goal was met but population goal was not |
| pass | checklist | player-matches-request | result.json shows player sonnet5 / anthropic/claude-sonnet-5, task detroit, seed 1 |
| pass | checklist | no-silent-outage | run.log shows 40 consecutive turns with no failed model calls and no gaps |

## Decision timeline

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

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Source: https://evaljetty.com/micropolis/runs/sonnet5-detroit-s1.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms