--- title: "GPT-5.6 Luna plays San Francisco 1906 (seed 1) | Micropolis run | Evals by Jetty" url: https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s1.html description: "GPT-5.6 Luna as mayor in Micropolis, San Francisco 1906: earthquake: lost, city score 21. 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-s1 # 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 21. [Decision log](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s1/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s1/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s1/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s1/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s1/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-s1/validation_report.json) GOAL MISSED seed 1 GPT-5.6 Luna openai/gpt-5.6-luna LOST: Population 23,680 (goal >= 100,000); engine verdict: lost Population (start → end)107,540 → 23,680 Peak population107,540City score (start → end)633 → 21 Funds at the end$0Crime / pollution / traffic73 / 54 / 4 Zones R / C / I97 / 56 / 50 Power plants (coal / nuclear)5 / 0Police / fire stations8 / 10 Turns (model / failed)20 (20 / 0) Actions applied / rejected233 / 51 Mean turn latency7.5sModel cost$0.050Wall clock2.6 min Jetty run ID7a99b8d9 ## 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 | 58 | | 1 | Apr 1906 | 102,740 | $17,898 | 669 | 71 | 58 | | 2 | Jul 1906 | 97,720 | $16,789 | 669 | 121 | 58 | | 3 | Oct 1906 | 87,520 | $14,536 | 669 | 129 | 63 | | 4 | Jan 1907 | 85,020 | $11,358 | 334 | 129 | 63 | | 5 | Apr 1907 | 76,820 | $9,450 | 334 | 119 | 65 | | 6 | Jul 1907 | 73,260 | $7,420 | 334 | 112 | 66 | | 7 | Oct 1907 | 70,060 | $5,505 | 334 | 112 | 66 | | 8 | Jan 1908 | 67,000 | $2,000 | 168 | 104 | 65 | | 9 | Apr 1908 | 61,980 | $1,769 | 168 | 104 | 64 | | 10 | Jul 1908 | 59,160 | $1,106 | 168 | 104 | 66 | | 11 | Oct 1908 | 57,960 | $705 | 168 | 99 | 66 | | 12 | Jan 1909 | 53,960 | $0 | 84 | 95 | 64 | | 13 | Apr 1909 | 49,440 | $0 | 84 | 95 | 65 | | 14 | Jul 1909 | 46,040 | $0 | 84 | 90 | 65 | | 15 | Oct 1909 | 41,600 | $0 | 84 | 84 | 65 | | 16 | Jan 1910 | 37,080 | $1,075 | 42 | 84 | 63 | | 17 | Apr 1910 | 34,120 | $795 | 42 | 74 | 61 | | 18 | Jul 1910 | 30,620 | $592 | 42 | 70 | 61 | | 19 | Oct 1910 | 27,480 | $490 | 42 | 70 | 58 | | 20 | Jan 1911 | 23,160 | $0 | 21 | 73 | 54 | ## Final map [![Final city map: GPT-5.6 Luna on San Francisco 1906: earthquake](https://evaljetty.com/micropolis/media/gpt56luna-sanfrancisco-s1-map.jpg)](https://evaljetty.com/micropolis/runs/gpt56luna-sanfrancisco-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 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 | 2.6 wall-minutes (model budget 45.0 min) | | fail | judge | scenario-goal | LOST: Population 23,680 (goal >= 100,000); engine verdict: lost (score 0 / threshold 1) | | pass | checklist | notes-explain-outcome | Notes section added with model thoughts from turns 1, 4, 12, and 20, explaining fire cascade, budget exhaustion, and population decline | | pass | checklist | player-matches-request | result.json confirms player=gpt56luna, task=sanfrancisco, seed=1 matching all requested parameters | | pass | checklist | no-silent-outage | run.log shows all 20 turns completed with 0 LLM failures and no gaps in turn logging | ## 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-s1.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms