---
title: "Claude Sonnet 5 plays Detroit 1972 (seed 2) | Micropolis run | Evals by Jetty"
url: https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2.html
description: "Claude Sonnet 5 as mayor in Micropolis, Detroit 1972: crime: lost, city score 341. 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-s2

# 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 341.

[Decision log](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2/validation_report.json)

GOAL MISSED seed 2

Claude Sonnet 5

anthropic/claude-sonnet-5

LOST: Average crime 28 (goal < 60), population 3,280 (floor 25,000); engine verdict: won

Population (start → end)76,160 → 3,280
Peak population76,180City score (start → end)285 → 341
Funds at the end$0Crime / pollution / traffic28 / 59 / 0
Zones R / C / I129 / 64 / 88
Power plants (coal / nuclear)2 / 3Police / fire stations15 / 7
Turns (model / failed)40 (40 / 0)
Actions applied / rejected98 / 36
Mean turn latency9.6sModel cost$0.718Wall clock6.6 min
Jetty run IDc55e7a2b

## 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 | 64 |
| 1 | Apr 1972 | 76,180 | $18,474 | 539 | 92 | 64 |
| 2 | Jul 1972 | 72,400 | $18,463 | 539 | 103 | 67 |
| 3 | Oct 1972 | 65,240 | $16,438 | 539 | 100 | 64 |
| 4 | Jan 1973 | 60,720 | $13,606 | 441 | 100 | 64 |
| 5 | Apr 1973 | 55,000 | $13,596 | 441 | 93 | 64 |
| 6 | Jul 1973 | 48,460 | $12,572 | 441 | 81 | 61 |
| 7 | Oct 1973 | 45,060 | $12,039 | 441 | 81 | 61 |
| 8 | Jan 1974 | 40,260 | $8,790 | 372 | 68 | 61 |
| 9 | Apr 1974 | 37,100 | $8,790 | 372 | 63 | 58 |
| 10 | Jul 1974 | 32,820 | $8,240 | 372 | 63 | 53 |
| 11 | Oct 1974 | 30,140 | $7,731 | 372 | 49 | 53 |
| 12 | Jan 1975 | 26,860 | $4,183 | 335 | 45 | 53 |
| 13 | Apr 1975 | 24,540 | $4,183 | 335 | 45 | 50 |
| 14 | Jul 1975 | 22,380 | $4,183 | 335 | 43 | 50 |
| 15 | Oct 1975 | 20,260 | $4,183 | 335 | 40 | 53 |
| 16 | Jan 1976 | 18,380 | $2,270 | 322 | 40 | 51 |
| 17 | Apr 1976 | 16,280 | $2,270 | 322 | 38 | 55 |
| 18 | Jul 1976 | 14,080 | $2,270 | 322 | 36 | 55 |
| 19 | Oct 1976 | 12,520 | $2,270 | 322 | 36 | 54 |
| 20 | Jan 1977 | 11,420 | $918 | 315 | 34 | 51 |
| 21 | Apr 1977 | 9,980 | $918 | 315 | 34 | 51 |
| 22 | Jul 1977 | 9,060 | $918 | 315 | 34 | 49 |
| 23 | Oct 1977 | 8,060 | $918 | 315 | 33 | 48 |
| 24 | Jan 1978 | 7,720 | $845 | 293 | 32 | 48 |
| 25 | Apr 1978 | 6,640 | $845 | 293 | 32 | 48 |
| 26 | Jul 1978 | 5,820 | $845 | 293 | 31 | 50 |
| 27 | Oct 1978 | 5,660 | $845 | 293 | 30 | 45 |
| 28 | Jan 1979 | 5,460 | $680 | 293 | 30 | 45 |
| 29 | Apr 1979 | 5,120 | $680 | 293 | 30 | 46 |
| 30 | Jul 1979 | 4,960 | $680 | 293 | 30 | 48 |
| 31 | Oct 1979 | 4,480 | $680 | 293 | 30 | 48 |
| 32 | Jan 1980 | 3,980 | $448 | 277 | 29 | 49 |
| 33 | Apr 1980 | 3,800 | $448 | 277 | 29 | 49 |
| 34 | Jul 1980 | 3,940 | $448 | 277 | 29 | 53 |
| 35 | Oct 1980 | 4,940 | $448 | 277 | 28 | 53 |
| 36 | Jan 1981 | 4,580 | $234 | 404 | 28 | 50 |
| 37 | Apr 1981 | 3,760 | $234 | 404 | 28 | 53 |
| 38 | Jul 1981 | 3,580 | $234 | 404 | 28 | 53 |
| 39 | Oct 1981 | 3,300 | $234 | 404 | 28 | 51 |
| 40 | Jan 1982 | 3,120 | $0 | 341 | 28 | 59 |

## Final map

[![Final city map: Claude Sonnet 5 on Detroit 1972: crime](https://evaljetty.com/micropolis/media/sonnet5-detroit-s2-map.jpg)](https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2/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 | 6.6 wall-minutes (model budget 45.0 min) |
| fail | judge | scenario-goal | LOST: Average crime 28 (goal < 60), population 3,280 (floor 25,000); engine verdict: won (score 0 / threshold 1) |
| pass | checklist | notes-explain-outcome | Notes section explains economic collapse vs crime reduction, cites model thoughts from turns 1, 8, and 40 |
| pass | checklist | player-matches-request | result.json confirms player=sonnet5 model=anthropic/claude-sonnet-5, task=detroit, seed=2 |
| pass | checklist | no-silent-outage | run.log shows 0 LLM failures across all 40 turns, no silent stretch |

## Decision timeline

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

---
Source: https://evaljetty.com/micropolis/runs/sonnet5-detroit-s2.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms