--- title: "GPT-5.6 Terra plays San Francisco 1906 (seed 2) | Micropolis run | Evals by Jetty" url: https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s2.html description: "GPT-5.6 Terra as mayor in Micropolis, San Francisco 1906: earthquake: lost, city score 37. 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 · gpt56terra-sanfrancisco-s2 # GPT-5.6 Terra 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 37. [Decision log](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s2/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s2/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s2/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s2/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s2/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s2/validation_report.json) GOAL MISSED seed 2 GPT-5.6 Terra openai/gpt-5.6-terra LOST: Population 38,880 (goal >= 100,000); engine verdict: lost Population (start → end)107,540 → 38,880 Peak population107,540City score (start → end)633 → 37 Funds at the end$0Crime / pollution / traffic78 / 47 / 9 Zones R / C / I151 / 68 / 55 Power plants (coal / nuclear)6 / 0Police / fire stations8 / 15 Turns (model / failed)20 (20 / 0) Actions applied / rejected225 / 23 Mean turn latency19.1sModel cost$0.682Wall clock6.4 min Jetty run IDb8e5bc93 ## 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 | 59 | | 1 | Apr 1906 | 104,280 | $14,946 | 667 | 71 | 59 | | 2 | Jul 1906 | 100,520 | $13,865 | 667 | 114 | 60 | | 3 | Oct 1906 | 98,100 | $12,544 | 667 | 121 | 59 | | 4 | Jan 1907 | 94,180 | $7,911 | 336 | 121 | 59 | | 5 | Apr 1907 | 93,360 | $5,829 | 336 | 128 | 59 | | 6 | Jul 1907 | 90,020 | $2,989 | 336 | 124 | 62 | | 7 | Oct 1907 | 86,220 | $2,058 | 336 | 124 | 62 | | 8 | Jan 1908 | 83,780 | $1,530 | 168 | 120 | 60 | | 9 | Apr 1908 | 83,060 | $419 | 168 | 113 | 61 | | 10 | Jul 1908 | 81,020 | $5 | 168 | 113 | 57 | | 11 | Oct 1908 | 79,560 | $5 | 168 | 112 | 57 | | 12 | Jan 1909 | 76,400 | $1,617 | 86 | 110 | 56 | | 13 | Apr 1909 | 73,520 | $933 | 86 | 110 | 55 | | 14 | Jul 1909 | 67,160 | $306 | 86 | 104 | 55 | | 15 | Oct 1909 | 62,900 | $158 | 86 | 98 | 51 | | 16 | Jan 1910 | 56,540 | $2,086 | 43 | 98 | 49 | | 17 | Apr 1910 | 52,180 | $1,626 | 43 | 93 | 48 | | 18 | Jul 1910 | 46,360 | $1,510 | 43 | 85 | 48 | | 19 | Oct 1910 | 42,540 | $1,334 | 43 | 85 | 46 | | 20 | Jan 1911 | 38,000 | $0 | 37 | 78 | 47 | ## Final map [![Final city map: GPT-5.6 Terra on San Francisco 1906: earthquake](https://evaljetty.com/micropolis/media/gpt56terra-sanfrancisco-s2-map.jpg)](https://evaljetty.com/micropolis/runs/gpt56terra-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 | 6.4 wall-minutes (model budget 45.0 min) | | fail | judge | scenario-goal | LOST: Population 38,880 (goal >= 100,000); engine verdict: lost (score 0 / threshold 1) | | pass | checklist | notes-explain-outcome | summary.md has a Notes section explaining the scenario loss with model thoughts from turns 1, 4, 8, and 20 | | pass | checklist | player-matches-request | result.json shows player=gpt56terra, task=sanfrancisco, seed=2 matching the requested parameters | | pass | checklist | no-silent-outage | run.log shows 0 LLM failures across all 20 turns, no gaps or repeated failures | ## Decision timeline What the mayor thought and did each turn. Click a turn to jump the timelapse there. --- Source: https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s2.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms