--- title: "GPT-5.6 Luna plays San Francisco 1906 (seed 2) | Micropolis run | Evals by Jetty" url: https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s2.html description: "GPT-5.6 Luna as mayor in Micropolis, San Francisco 1906: earthquake: lost, city score 22. 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 · gpt56luna-sanfrancisco-s2 # GPT-5.6 Luna 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 22. [Decision log](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s2/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s2/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s2/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s2/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s2/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s2/validation_report.json) GOAL MISSED seed 2 GPT-5.6 Luna openai/gpt-5.6-luna LOST: Population 48,220 (goal >= 100,000); engine verdict: lost Population (start → end)107,540 → 48,220 Peak population107,540City score (start → end)633 → 22 Funds at the end$156Crime / pollution / traffic81 / 58 / 16 Zones R / C / I159 / 59 / 73 Power plants (coal / nuclear)8 / 0Police / fire stations8 / 10 Turns (model / failed)20 (20 / 0) Actions applied / rejected142 / 32 Mean turn latency7.2sModel cost$0.043Wall clock2.5 min Jetty run IDcd12e212 ## 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 | 55 | | 1 | Apr 1906 | 103,840 | $18,451 | 671 | 71 | 55 | | 2 | Jul 1906 | 102,400 | $17,474 | 671 | 111 | 59 | | 3 | Oct 1906 | 103,100 | $16,226 | 671 | 119 | 61 | | 4 | Jan 1907 | 102,980 | $12,246 | 335 | 119 | 61 | | 5 | Apr 1907 | 101,380 | $11,472 | 335 | 115 | 60 | | 6 | Jul 1907 | 100,240 | $4,937 | 335 | 115 | 62 | | 7 | Oct 1907 | 96,180 | $4,243 | 335 | 115 | 62 | | 8 | Jan 1908 | 94,420 | $0 | 167 | 113 | 61 | | 9 | Apr 1908 | 90,760 | $0 | 167 | 110 | 60 | | 10 | Jul 1908 | 88,760 | $0 | 167 | 110 | 59 | | 11 | Oct 1908 | 86,100 | $0 | 167 | 106 | 59 | | 12 | Jan 1909 | 84,100 | $1,457 | 89 | 103 | 59 | | 13 | Apr 1909 | 81,100 | $732 | 89 | 103 | 60 | | 14 | Jul 1909 | 76,980 | $443 | 89 | 100 | 60 | | 15 | Oct 1909 | 71,740 | $74 | 89 | 97 | 61 | | 16 | Jan 1910 | 66,180 | $0 | 44 | 97 | 62 | | 17 | Apr 1910 | 60,940 | $0 | 44 | 92 | 59 | | 18 | Jul 1910 | 56,800 | $0 | 44 | 85 | 59 | | 19 | Oct 1910 | 51,860 | $0 | 44 | 85 | 57 | | 20 | Jan 1911 | 47,320 | $156 | 22 | 81 | 58 | ## Final map [![Final city map: GPT-5.6 Luna on San Francisco 1906: earthquake](https://evaljetty.com/micropolis/media/gpt56luna-sanfrancisco-s2-map.jpg)](https://evaljetty.com/micropolis/runs/gpt56luna-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 | 2.5 wall-minutes (model budget 45.0 min) | | fail | judge | scenario-goal | LOST: Population 48,220 (goal >= 100,000); engine verdict: lost (score 0 / threshold 1) | | pass | checklist | notes-explain-outcome | Notes section cites model thoughts from turns 1, 9 and 20 and explains the treasury collapse that caused population decline | | pass | checklist | player-matches-request | result.json confirms player gpt56luna, model openai/gpt-5.6-luna, task sanfrancisco, seed 2 | | pass | checklist | no-silent-outage | run.log shows 20 turns with 0 LLM failures and no gaps; max\_broke\_streak 7 is a game event, not a model outage | ## Decision timeline What the mayor thought and did each turn. Click a turn to jump the timelapse there. --- Source: https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s2.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms