--- title: "GPT-5.6 Terra plays San Francisco 1906 (seed 1) | Micropolis run | Evals by Jetty" url: https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s1.html description: "GPT-5.6 Terra as mayor in Micropolis, San Francisco 1906: earthquake: lost, city score 39. 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-s1 # 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 39. [Decision log](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s1/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s1/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s1/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s1/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s1/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/gpt56terra-sanfrancisco-s1/validation_report.json) GOAL MISSED seed 1 GPT-5.6 Terra openai/gpt-5.6-terra LOST: Population 47,680 (goal >= 100,000); engine verdict: lost Population (start → end)107,540 → 47,680 Peak population107,540City score (start → end)633 → 39 Funds at the end$0Crime / pollution / traffic80 / 48 / 14 Zones R / C / I143 / 55 / 59 Power plants (coal / nuclear)6 / 0Police / fire stations10 / 7 Turns (model / failed)20 (20 / 0) Actions applied / rejected186 / 11 Mean turn latency19.2sModel cost$0.646Wall clock6.4 min Jetty run IDd5eb8764 ## 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 | 103,220 | $15,943 | 662 | 71 | 55 | | 2 | Jul 1906 | 97,940 | $13,233 | 662 | 122 | 57 | | 3 | Oct 1906 | 94,540 | $11,958 | 662 | 129 | 57 | | 4 | Jan 1907 | 91,040 | $5,184 | 331 | 129 | 57 | | 5 | Apr 1907 | 89,620 | $2,292 | 331 | 122 | 57 | | 6 | Jul 1907 | 87,260 | $716 | 331 | 120 | 57 | | 7 | Oct 1907 | 85,520 | $706 | 331 | 120 | 57 | | 8 | Jan 1908 | 83,940 | $1,379 | 165 | 118 | 52 | | 9 | Apr 1908 | 79,940 | $434 | 165 | 114 | 54 | | 10 | Jul 1908 | 79,640 | $16 | 165 | 114 | 53 | | 11 | Oct 1908 | 77,880 | $16 | 165 | 114 | 53 | | 12 | Jan 1909 | 78,140 | $1,064 | 82 | 112 | 56 | | 13 | Apr 1909 | 76,640 | $208 | 82 | 112 | 52 | | 14 | Jul 1909 | 76,020 | $100 | 82 | 105 | 52 | | 15 | Oct 1909 | 72,460 | $100 | 82 | 104 | 51 | | 16 | Jan 1910 | 65,540 | $4,328 | 41 | 104 | 51 | | 17 | Apr 1910 | 60,500 | $1,293 | 41 | 97 | 52 | | 18 | Jul 1910 | 53,300 | $1,020 | 41 | 88 | 52 | | 19 | Oct 1910 | 49,680 | $662 | 41 | 88 | 49 | | 20 | Jan 1911 | 47,660 | $0 | 39 | 80 | 48 | ## Final map [![Final city map: GPT-5.6 Terra on San Francisco 1906: earthquake](https://evaljetty.com/micropolis/media/gpt56terra-sanfrancisco-s1-map.jpg)](https://evaljetty.com/micropolis/runs/gpt56terra-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 | 6.4 wall-minutes (model budget 45.0 min) | | fail | judge | scenario-goal | LOST: Population 47,680 (goal >= 100,000); engine verdict: lost (score 0 / threshold 1) | | pass | checklist | notes-explain-outcome | summary.md has a Notes section with three cited model thoughts from turns 1, 9, and 20 | | pass | checklist | player-matches-request | result.json confirms player=gpt56terra task=sanfrancisco seed=1 as requested | | pass | checklist | no-silent-outage | run.log shows 20/20 turns logged with 0 llm\_failures, no gaps or silent 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-s1.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms