02 — Run · Round 1 · Grow a city · sonnet5-grow-s2
Claude Sonnet 5 plays Grow a city
Empty generated map, $20,000, 20 years: reach 10,000 people without going bankrupt. Ended Jan 1920: 1,200 people, city score 431.
GOAL MISSED seed 2
Claude Sonnet 5
anthropic/claude-sonnet-5
population 1,200 (goal 10,000), city score 431
Population (start → end)0 → 1,200
Peak population14,880City score (start → end)500 → 431
Funds at the end$3,876Crime / pollution / traffic8 / 52 / 0
Zones R / C / I39 / 17 / 26
Power plants (coal / nuclear)2 / 0Police / fire stations2 / 1
Turns (model / failed)80 (80 / 0)
Actions applied / rejected211 / 55
Mean turn latency10.5sModel cost$1.390Wall clock14.2 min
Jetty run ID40c8cf3e
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 | 0 | $15,295 | 712 | 0 | 0 |
| 2 | Jul 1900 | 220 | $13,211 | 712 | 20 | 41 |
| 3 | Oct 1900 | 920 | $12,753 | 712 | 4 | 44 |
| 4 | Jan 1901 | 1,400 | $11,704 | 532 | 4 | 44 |
| 5 | Apr 1901 | 2,220 | $11,316 | 532 | 3 | 50 |
| 6 | Jul 1901 | 3,000 | $10,837 | 532 | 11 | 48 |
| 7 | Oct 1901 | 3,840 | $10,327 | 532 | 11 | 48 |
| 8 | Jan 1902 | 4,560 | $9,132 | 550 | 16 | 47 |
| 9 | Apr 1902 | 6,420 | $8,483 | 550 | 22 | 47 |
| 10 | Jul 1902 | 7,100 | $4,691 | 550 | 22 | 59 |
| 11 | Oct 1902 | 8,220 | $4,368 | 550 | 35 | 59 |
| 12 | Jan 1903 | 10,100 | $4,575 | 697 | 41 | 61 |
| 13 | Apr 1903 | 10,720 | $4,257 | 697 | 41 | 65 |
| 14 | Jul 1903 | 11,540 | $3,925 | 697 | 50 | 65 |
| 15 | Oct 1903 | 13,300 | $3,914 | 697 | 53 | 67 |
| 16 | Jan 1904 | 13,820 | $3,306 | 691 | 53 | 78 |
| 17 | Apr 1904 | 14,640 | $2,765 | 691 | 60 | 79 |
| 18 | Jul 1904 | 14,880 | $2,565 | 691 | 66 | 79 |
| 19 | Oct 1904 | 13,920 | $2,263 | 691 | 66 | 79 |
| 20 | Jan 1905 | 12,040 | $2,613 | 505 | 65 | 73 |
| 21 | Apr 1905 | 10,620 | $2,598 | 505 | 57 | 73 |
| 22 | Jul 1905 | 9,880 | $2,588 | 505 | 57 | 65 |
| 23 | Oct 1905 | 8,700 | $2,588 | 505 | 50 | 62 |
| 24 | Jan 1906 | 7,500 | $2,789 | 391 | 36 | 62 |
| 25 | Apr 1906 | 5,500 | $2,789 | 391 | 36 | 61 |
| 26 | Jul 1906 | 5,160 | $2,789 | 391 | 27 | 60 |
| 27 | Oct 1906 | 4,300 | $2,789 | 391 | 20 | 62 |
| 28 | Jan 1907 | 3,940 | $2,862 | 327 | 20 | 62 |
| 29 | Apr 1907 | 3,780 | $2,857 | 327 | 20 | 66 |
| 30 | Jul 1907 | 3,460 | $2,857 | 327 | 19 | 55 |
| 31 | Oct 1907 | 3,260 | $2,857 | 327 | 19 | 55 |
| 32 | Jan 1908 | 2,900 | $3,091 | 353 | 16 | 55 |
| 33 | Apr 1908 | 2,960 | $3,091 | 353 | 15 | 49 |
| 34 | Jul 1908 | 2,640 | $3,091 | 353 | 15 | 49 |
| 35 | Oct 1908 | 2,460 | $3,091 | 353 | 15 | 49 |
| 36 | Jan 1909 | 2,460 | $3,209 | 416 | 14 | 52 |
| 37 | Apr 1909 | 2,100 | $3,209 | 416 | 14 | 49 |
| 38 | Jul 1909 | 2,280 | $3,209 | 416 | 13 | 49 |
| 39 | Oct 1909 | 3,220 | $3,209 | 416 | 12 | 43 |
| 40 | Jan 1910 | 2,840 | $3,356 | 537 | 12 | 44 |
| 41 | Apr 1910 | 2,540 | $3,356 | 537 | 13 | 44 |
| 42 | Jul 1910 | 2,180 | $3,356 | 537 | 15 | 45 |
| 43 | Oct 1910 | 2,200 | $3,356 | 537 | 15 | 48 |
| 44 | Jan 1911 | 2,140 | $3,424 | 479 | 14 | 48 |
| 45 | Apr 1911 | 1,920 | $3,424 | 479 | 12 | 48 |
| 46 | Jul 1911 | 1,780 | $3,424 | 479 | 12 | 42 |
| 47 | Oct 1911 | 2,600 | $3,424 | 479 | 12 | 43 |
| 48 | Jan 1912 | 2,520 | $3,564 | 611 | 13 | 43 |
| 49 | Apr 1912 | 1,960 | $3,564 | 611 | 13 | 49 |
| 50 | Jul 1912 | 1,680 | $3,564 | 611 | 11 | 55 |
| 51 | Oct 1912 | 1,780 | $3,564 | 611 | 10 | 47 |
| 52 | Jan 1913 | 2,560 | $3,542 | 583 | 10 | 47 |
| 53 | Apr 1913 | 2,960 | $3,527 | 583 | 14 | 41 |
| 54 | Jul 1913 | 2,180 | $3,527 | 583 | 17 | 43 |
| 55 | Oct 1913 | 2,000 | $3,527 | 583 | 17 | 43 |
| 56 | Jan 1914 | 1,840 | $3,608 | 467 | 14 | 43 |
| 57 | Apr 1914 | 1,480 | $3,608 | 467 | 14 | 41 |
| 58 | Jul 1914 | 1,360 | $3,608 | 467 | 14 | 41 |
| 59 | Oct 1914 | 1,240 | $3,608 | 467 | 11 | 41 |
| 60 | Jan 1915 | 1,260 | $3,648 | 375 | 11 | 43 |
| 61 | Apr 1915 | 1,280 | $3,648 | 375 | 11 | 41 |
| 62 | Jul 1915 | 1,080 | $3,648 | 375 | 12 | 41 |
| 63 | Oct 1915 | 1,120 | $3,648 | 375 | 11 | 41 |
| 64 | Jan 1916 | 1,120 | $3,705 | 362 | 11 | 41 |
| 65 | Apr 1916 | 960 | $3,705 | 362 | 11 | 41 |
| 66 | Jul 1916 | 980 | $3,705 | 362 | 10 | 41 |
| 67 | Oct 1916 | 1,720 | $3,705 | 362 | 10 | 41 |
| 68 | Jan 1917 | 4,160 | $3,815 | 681 | 10 | 48 |
| 69 | Apr 1917 | 4,060 | $3,783 | 681 | 17 | 48 |
| 70 | Jul 1917 | 3,300 | $3,783 | 681 | 17 | 48 |
| 71 | Oct 1917 | 2,720 | $3,783 | 681 | 14 | 47 |
| 72 | Jan 1918 | 1,880 | $3,836 | 450 | 12 | 47 |
| 73 | Apr 1918 | 1,620 | $3,836 | 450 | 12 | 52 |
| 74 | Jul 1918 | 1,680 | $3,836 | 450 | 10 | 52 |
| 75 | Oct 1918 | 1,660 | $3,836 | 450 | 9 | 52 |
| 76 | Jan 1919 | 1,640 | $3,877 | 466 | 9 | 52 |
| 77 | Apr 1919 | 1,420 | $3,877 | 466 | 9 | 52 |
| 78 | Jul 1919 | 1,340 | $3,877 | 466 | 9 | 52 |
| 79 | Oct 1919 | 1,240 | $3,877 | 466 | 9 | 52 |
| 80 | Jan 1920 | 1,200 | $3,876 | 431 | 8 | 52 |
Final map
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 | 0/80 model turns failed |
| pass | code_check | video-decodes | duration 35.6s |
| pass | code_check | limits-respected | 14.2 wall-minutes (model budget 45.0 min) |
| fail | judge | city-goal | population 1,200 (goal 10,000), city score 431 (score 1,200 / threshold 10,000) |
| pass | checklist | notes-explain-outcome | summary.md has a Notes section with quotes from turns 1, 18, 30, and 80 explaining the rise-and-fall pattern |
| pass | checklist | player-matches-request | result.json shows player.id=sonnet5, task=grow, seed=2 matching the runbook parameters |
| pass | checklist | no-silent-outage | 0 LLM failures across all 80 turns, no autopilot engaged, run.log shows continuous turn-by-turn progress |
Decision timeline
What the mayor thought and did each turn. Click a turn to jump the timelapse there.