--- title: "Claude Sonnet 5 plays San Francisco 1906 (seed 2) | Micropolis run | Evals by Jetty" url: https://evaljetty.com/micropolis/runs/sonnet5-sanfrancisco-s2.html description: "Claude Sonnet 5 as mayor in Micropolis, San Francisco 1906: earthquake: lost, city score 27. Timelapse, charts, every decision and the run's evaluation." updated: 2026-09-28 publisher: Jetty (https://jetty.io) --- 02 — Run · Round 1 · San Francisco 1906: earthquake · sonnet5-sanfrancisco-s2 # Claude Sonnet 5 plays San Francisco 1906 An earthquake hits San Francisco in 1906. Be a Metropolis (100,000 people) within 5 years. Ended Jan 1911: lost, city score 27. [Decision log](https://evaljetty.com/micropolis/runs/sonnet5-sanfrancisco-s2/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/sonnet5-sanfrancisco-s2/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/sonnet5-sanfrancisco-s2/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/sonnet5-sanfrancisco-s2/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/sonnet5-sanfrancisco-s2/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/sonnet5-sanfrancisco-s2/validation_report.json) GOAL MISSED seed 2 Claude Sonnet 5 anthropic/claude-sonnet-5 LOST: Population 72,300 (goal >= 100,000); engine verdict: lost Population (start → end)107,540 → 72,300 Peak population107,540City score (start → end)633 → 27 Funds at the end$388Crime / pollution / traffic102 / 61 / 21 Zones R / C / I163 / 59 / 76 Power plants (coal / nuclear)4 / 0Police / fire stations8 / 4 Turns (model / failed)20 (20 / 0) Actions applied / rejected195 / 23 Mean turn latency12.8sModel cost$0.451Wall clock4.3 min Jetty run IDfd728217 ## 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 1906 | 107,540 | $20,000 | 633 | 71 | 57 | | 1 | Apr 1906 | 105,020 | $19,439 | 669 | 71 | 57 | | 2 | Jul 1906 | 101,180 | $18,791 | 669 | 114 | 61 | | 3 | Oct 1906 | 98,920 | $18,760 | 669 | 125 | 60 | | 4 | Jan 1907 | 96,960 | $17,364 | 334 | 125 | 60 | | 5 | Apr 1907 | 95,940 | $16,036 | 334 | 115 | 59 | | 6 | Jul 1907 | 94,440 | $14,701 | 334 | 112 | 57 | | 7 | Oct 1907 | 93,060 | $12,640 | 334 | 112 | 57 | | 8 | Jan 1908 | 93,280 | $9,636 | 196 | 108 | 57 | | 9 | Apr 1908 | 91,900 | $8,304 | 196 | 107 | 60 | | 10 | Jul 1908 | 93,940 | $6,675 | 196 | 107 | 61 | | 11 | Oct 1908 | 92,720 | $5,520 | 196 | 107 | 61 | | 12 | Jan 1909 | 90,740 | $2,701 | 109 | 105 | 60 | | 13 | Apr 1909 | 90,160 | $1,986 | 109 | 105 | 61 | | 14 | Jul 1909 | 89,860 | $1,959 | 109 | 105 | 61 | | 15 | Oct 1909 | 87,100 | $1,919 | 109 | 108 | 62 | | 16 | Jan 1910 | 85,420 | $1,283 | 54 | 108 | 58 | | 17 | Apr 1910 | 83,140 | $1,235 | 54 | 106 | 58 | | 18 | Jul 1910 | 79,220 | $1,132 | 54 | 104 | 58 | | 19 | Oct 1910 | 75,020 | $1,107 | 54 | 104 | 62 | | 20 | Jan 1911 | 71,680 | $388 | 27 | 102 | 61 | ## Final map [![Final city map: Claude Sonnet 5 on San Francisco 1906: earthquake](https://evaljetty.com/micropolis/media/sonnet5-sanfrancisco-s2-map.jpg)](https://evaljetty.com/micropolis/runs/sonnet5-sanfrancisco-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 1911 after 20 turns; scenario verdict False | | pass | code\_check | decisions-logged | 20 rows for 20 turns | | pass | code\_check | llm-turns-valid | 0/20 model turns failed | | pass | code\_check | video-decodes | duration 30.0s | | pass | code\_check | limits-respected | 4.3 wall-minutes (model budget 45.0 min) | | fail | judge | scenario-goal | LOST: Population 72,300 (goal >= 100,000); engine verdict: lost (score 0 / threshold 1) | | pass | checklist | notes-explain-outcome | summary.md Notes section cites model thoughts from turns 1, 9, and 20 and explains the fire-driven population decline | | pass | checklist | player-matches-request | result.json shows player=sonnet5 model=anthropic/claude-sonnet-5 task=sanfrancisco seed=2 | | pass | checklist | no-silent-outage | run.log shows 20 consecutive successful turns with 0 LLM failures and no gaps | ## 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-sanfrancisco-s2.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms