---
title: "GPT-5.6 Terra vs GPT-5.6 Luna | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt56luna-g1.html
description: "GPT-5.6 Terra destroyed the enemy base. Watch the full game with both models' reasoning and the run's evaluation."
updated: 2026-09-28
publisher: Jetty (https://jetty.io)
---

02 — Run · Round 2 · Round robin · r2-rr-gpt56terra-gpt56luna-g1

# GPT-5.6 Terra vs GPT-5.6 Luna

GPT-5.6 Terra destroyed the enemy base after 4.7 game-minutes · 6.0 min wall clock

Jetty run 53107caf
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-gpt56terra-gpt56luna-g1.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt56luna-g1/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt56luna-g1/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt56luna-g1/validation_report.json)

WIN england · west

GPT-5.6 Terra

openai/gpt-5.6-terra

Value destroyed$8,000Value lost$500
Units killed / lost1 / 3Buildings killed / lost6 / 0
Peak army$6,700Orders issued75
Decision turns (failed)36 (0)Mean latency3.6sModel cost$0.256

LOSS ukraine · east

GPT-5.6 Luna

openai/gpt-5.6-luna

Value destroyed$500Value lost$8,000
Units killed / lost3 / 1Buildings killed / lost0 / 6
Peak army$600Orders issued27
Decision turns (failed)36 (0)Mean latency3.2sModel cost$0.027

## Evaluation

passchecks **10/10** verdict computed from the gating checks

| Status | Kind | Check | Detail |
| --- | --- | --- | --- |
| pass | step | environment | Environment check (snapshot, engine, content, key) |
| pass | step | launch | Launch run-match as a detached process |
| pass | step | supervise | Supervise in the foreground until run-match exits |
| pass | step | render | Render the 1080p recording |
| pass | step | notes | Append Notes to summary.md |
| pass | code\_check | outputs-exist | all present |
| pass | code\_check | game-has-winner | gpt56terra won: base destroyed |
| pass | code\_check | decisions-logged | turns per slot: {'Multi0': 36, 'Multi1': 36} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/36', 'Multi1': '0/36'} |
| pass | code\_check | video-decodes | duration 48.7s |
| pass | code\_check | video-complete | video ends at tick 7001 of 7001 |
| pass | code\_check | limits-respected | ended after 6.0 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | Notes section explains Terra infantry assault and cites last thoughts of both models |
| pass | checklist | players-match-request | result.json shows gpt56terra (Multi0) and gpt56luna (Multi1) exactly as requested |
| pass | checklist | no-silent-outage | run.log shows continuous decision turns every ~4-8s with 0 LLM failures for both players |

## Decision timeline

What each model saw as its situation and what it ordered, every 8 game-seconds. Click a turn to jump the video there.

## Decision timeline

Every 8 game-seconds each model received a text briefing and replied with its reasoning and commands. Time is game time.

- **0:00 GPT-5.6 Terra**: Deploy immediately and start the standard power/refinery opening. Enemy is likely far west, so establish economy before scouting.
- **0:00 GPT-5.6 Luna**: Deploy the MCV immediately, then begin the power-and-economy opening. Once construction is active, I will place power, refinery, barracks, and expand production while scouting toward the enemy at the northeast.
- **0:08 GPT-5.6 Terra**: Construction Yard is deployed and the first power plant is underway. I will place it as soon as ready, then immediately establish ore income and infantry production.
- **0:08 GPT-5.6 Luna**: Construction Yard is deployed and the first power plant should now be ready to place. I’ll establish power and ore income, then add infantry and vehicles while scouting toward the enemy’s likely base.
- **0:16 GPT-5.6 Terra**: Opening economy immediately with power, then refinery and barracks. Enemy is likely far west, so establish production before scouting.
- **0:16 GPT-5.6 Luna**: Deploy the MCV, start the power plant, and keep the economy opening moving toward refinery and army production.
- **0:24 GPT-5.6 Terra**: Deploy the opening power plant immediately, then start a refinery to establish income. Enemy is likely far west, so prioritize a strong economic opening before scouting.
- **0:24 GPT-5.6 Luna**: Place the ready power plant, then start an ore refinery to establish income. After that, build a barracks and begin scouting toward the likely enemy position once units are available.
- **0:32 GPT-5.6 Terra**: Construction Yard and initial power are established. Start the first refinery immediately, then place it and establish infantry production next turn.
- **0:32 GPT-5.6 Luna**: Construction Yard is active and power is sufficient; start the first refinery immediately, then add infantry and vehicle production. With no units yet, prioritize economy and a barracks so we can scout toward the suspected enemy base.
- **0:40 GPT-5.6 Terra**: The first refinery is still constructing. I will preserve cash until it is ready, then immediately place it and establish infantry production.
- **0:40 GPT-5.6 Luna**: The refinery is still under construction, so I will wait for placement and then establish infantry and vehicle production. The base has ample power and cash for the opening economy.
- **0:48 GPT-5.6 Terra**: First refinery is still constructing; it will provide the initial harvester and income. I will place it immediately next turn, then add infantry production and expand ore collection.
- **0:48 GPT-5.6 Luna**: The refinery is still under construction, with ample power and cash. I will place it as soon as ready, then start infantry and vehicle production while scouting toward the likely enemy base.
- **0:56 GPT-5.6 Terra**: First refinery is nearly complete; place it immediately when ready, then establish barracks and expand economy toward vehicle production. Enemy is expected far west, so prioritize a strong early armored force.
- **0:56 GPT-5.6 Luna**: The refinery is still under construction at 70%, so I will wait for it to finish before placing it and starting military production.
- **1:04 GPT-5.6 Terra**: First refinery is about to complete; place it immediately to start income, then establish infantry production. Enemy is likely far west, so build economy before scouting force.
- **1:04 GPT-5.6 Luna**: The refinery is nearly complete; wait for it to finish, then place it near the Construction Yard to start harvesting. After placement, build a barracks and begin scouting toward the likely enemy position northeast.
- **1:12 GPT-5.6 Terra**: The first refinery is ready and must be placed immediately to start income. Barracks construction is underway; after it completes, we will begin infantry production and expand into a second refinery/war factory.
- **1:12 GPT-5.6 Luna**: Place the ready refinery immediately to start income, then build a barracks and begin scouting infantry. Follow with a second refinery and war factory while expanding power as needed.
- **1:20 GPT-5.6 Terra**: Second refinery is placed and the barracks is nearing completion. Maintain mining, then immediately use the barracks for scouting infantry and begin a War Factory or second refinery based on cash flow.
- **1:20 GPT-5.6 Luna**: Place the ready refinery to increase income and keep the barracks/next refinery construction progressing. Once the barracks is available, begin infantry production, then build a War Factory for tanks and scouting toward the enemy at the northeast.
- **1:28 GPT-5.6 Terra**: Barracks is ready and the economy needs a second refinery immediately. I will begin infantry production for scouting and map control while expanding ore income toward a War Factory.
- **1:28 GPT-5.6 Luna**: The refinery is nearly complete; place it to secure a second harvester, then build barracks for immediate infantry production while the War Factory remains queued. Maintain power and begin scouting toward the likely enemy start once units are available.
- **1:36 GPT-5.6 Terra**: Second refinery is underway and power is ample. I will mass infantry immediately, rally them west toward the enemy start, then place the refinery and expand into vehicle production.
- **1:36 GPT-5.6 Luna**: The refinery is nearly ready; place it as soon as possible, then complete the queued power and barracks so infantry production can begin. Keep spending toward a War Factory and scout east toward the likely enemy start once units are available.
- **1:44 GPT-5.6 Terra**: Second refinery is building and infantry production is already queued. I will scout aggressively west toward the likely enemy start while keeping the barracks rally forward.
- **1:44 GPT-5.6 Luna**: The second refinery is nearly complete; place it now to improve income, then place the ready War Factory if available. Start a barracks afterward and begin building a tank force, scouting toward the likely enemy base.
- **1:52 GPT-5.6 Terra**: Second refinery is nearly ready and will strengthen income. Continue infantry production while scouting west toward the likely enemy start, then transition into a War Factory as soon as funds permit.
- **1:52 GPT-5.6 Luna**: Place the ready second refinery to increase income. Keep the building queue moving toward a War Factory, then produce infantry as soon as the barracks is operational; no enemy contact yet.
- **2:00 GPT-5.6 Terra**: Second refinery is nearly ready, and rifle scouts are advancing west toward the likely Soviet start. Keep infantry flowing and use the scouts to reveal the enemy while preparing to place the refinery next turn.
- **2:00 GPT-5.6 Luna**: Place the ready second refinery, then establish infantry production while the war factory finishes. Power is adequate, so prioritize army and send the first combat units toward the likely enemy position once available.
- **2:08 GPT-5.6 Terra**: Second refinery is ready and should be placed to strengthen income. The rifle scout force will continue toward the likely Soviet start while production funds accumulate for a War Factory.
- **2:08 GPT-5.6 Luna**: The war factory is nearly complete and the economy is stable with two harvesters, but I have no combat units or enemy vision yet. Keep the queued infrastructure moving, add another refinery for income, then begin nonstop heavy-tank production and scout northeast toward the likely enemy base.
- **2:16 GPT-5.6 Terra**: Two refineries are running and the western scout is progressing toward the likely enemy start. I will keep infantry production active, consolidate the scout into an attack-move, and preserve cash toward a War Factory while power remains adequate.
- **2:16 GPT-5.6 Luna**: The War Factory is nearly complete and the existing construction queue is adequate for economy and power. Keep both harvesters mining; begin tank production as soon as the factory finishes and avoid spending cash on defenses for now.
- **2:24 GPT-5.6 Terra**: Our rifle scouts are advancing but have not located the enemy yet. Keep pressure toward the likely western start while harvesting funds for a War Factory.
- **2:24 GPT-5.6 Luna**: The first War Factory is nearly complete and the queued refinery, power, barracks, and additional factories will maintain expansion. Keep both harvesters mining while production finishes; then begin Soviet tank production and scout northeast toward the likely enemy base.
- **2:32 GPT-5.6 Terra**: Our infantry screen is advancing toward the likely western enemy base, while the economy has two refineries. Build power immediately to support a War Factory, keep infantry production active, and push the rocket soldiers west behind the rifles.
- **2:32 GPT-5.6 Luna**: The first War Factory is nearly complete and the existing build queue is well stocked with refineries, power, barracks, and additional factories. Keep both harvesters mining and wait for the factory to finish so tank production can begin immediately.
- **2:40 GPT-5.6 Terra**: Place the ready power plant to create room for upcoming War Factory power demand. Consolidate the scattered infantry and rockets into a westward assault toward the likely Soviet start while the economy accumulates for a War Factory.
- **2:40 GPT-5.6 Luna**: The first War Factory is nearly complete and the economy is healthy with two harvesters. Place it immediately, start a Heavy Tank production stream, and send the first armor northeast to scout and attack toward the likely enemy base.
- **2:48 GPT-5.6 Terra**: Our infantry screen is nearly at the suspected enemy start with no resistance spotted yet. Keep rifle production queued and push all combat units west to reveal and pressure the enemy base while saving for a War Factory.
- **2:48 GPT-5.6 Luna**: The War Factory is still not placed, so I will retry placement near the base and then begin a heavy-tank production plan. Economy and power are currently adequate; the harvesters remain mining.
- **2:56 GPT-5.6 Terra**: Our infantry column is closing on the likely enemy start while the economy processes ore through two refineries. Keep all combat units advancing west and rally new infantry toward the attack route; save for a War Factory.
- **2:56 GPT-5.6 Luna**: The base is under light infantry pressure, but no combat force is available yet. Keep the War Factory busy with mobile flak and an APC while the queued refinery and power plant finish; use the new units to clear the nearby attackers and then scout toward the enemy start.
- **3:04 GPT-5.6 Terra**: Our infantry column is nearly at the likely Soviet start and should press west immediately to reveal and destroy the base. Keep the barracks stream rallied directly into the attack while refinery income accumulates for a War Factory.
- **3:04 GPT-5.6 Luna**: Power is critically low, but a refinery and several power/production structures are already queued. Keep the War Factory producing mobile anti-infantry units, rally them toward the nearby enemy infantry, and avoid spending on defenses until power stabilizes.
- **3:12 GPT-5.6 Terra**: Infantry column is advancing deep toward the enemy start and barracks production is fully queued. Economy is converting ore with two harvesters; save for a War Factory while keeping the attack moving.
- **3:12 GPT-5.6 Luna**: Power is critically low, but the queued power plant should complete shortly. Keep both harvesters mining, continue the flak/APC production, and rally the war factory east so the first vehicles can clear the infantry and scout toward the enemy base.
- **3:20 GPT-5.6 Terra**: Our infantry spearhead has reached the likely enemy start area but has not yet revealed structures. Keep pressure west, maintain infantry production, and save income for the first War Factory.
- **3:20 GPT-5.6 Luna**: Power is critically low, but multiple power plants are already queued and should restore production soon. The enemy infantry blob is immediately east; finish the mobile flak and send it to clear them, while repairing the damaged refinery and factory and keeping harvesters mining.
- **3:28 GPT-5.6 Terra**: Our infantry spearhead has reached the likely enemy start area and should immediately sweep it for buildings. Economy is still too low for a War Factory, so preserve income and avoid adding more infantry queues until funds accumulate.
- **3:28 GPT-5.6 Luna**: The enemy infantry blob is threatening the base while power is critically low. Keep the existing power and vehicle queues running, pull harvesters away from the eastern probe, and add a Tesla Coil to blunt the attack once power comes online.
- **3:36 GPT-5.6 Terra**: Our large infantry force is crossing toward the likely enemy start and has already destroyed one building. Keep barracks production running while saving income for a War Factory, then transition into vehicles.
- **3:36 GPT-5.6 Luna**: Place the ready Power Plant immediately to restore production, then maintain power expansion. The enemy infantry blob is dangerously close, so keep the Tesla Coil and Mobile Flak production running while harvesters continue mining.
- **3:44 GPT-5.6 Terra**: Our infantry swarm has reached the enemy start area and an exposed low-health power plant is visible. Focus-fire it to cripple the enemy while keeping the existing infantry queue running and saving income for a War Factory.
- **3:44 GPT-5.6 Luna**: Place the ready power plant immediately to restore production, then add a barracks and keep vehicle production active. The enemy infantry mass is directly east of the base; use the flak to engage them while the Tesla Coil finishes, but avoid exposing harvesters.
- **3:52 GPT-5.6 Terra**: Our infantry column has reached the enemy start area and has already destroyed several buildings, but no targets are currently visible. Keep pressure at the enemy base while saving for a War Factory; harvesters must keep mining.
- **3:52 GPT-5.6 Luna**: Power is critically low and enemy infantry is pressing the base. Finish the pending power plant and Tesla Coil, repair the damaged Construction Yard and War Factory, then use APC/flak and newly available infantry to clear the attackers.
- **4:00 GPT-5.6 Terra**: Our large infantry force is already across the map and the exposed enemy Construction Yard and War Factory are both critically damaged. Finish them immediately while continuing infantry production; this can end the match before armor is needed.
- **4:00 GPT-5.6 Luna**: The base is critically underpowered and enemy infantry is already at the perimeter. Place the ready power plant immediately, keep repairs active, finish the Tesla Coil, and use the War Factory to produce an APC for emergency defense.
- **4:08 GPT-5.6 Terra**: The enemy Construction Yard is barely standing and our infantry surround it. Focus all combat units on it for the immediate win while keeping infantry production active.
- **4:08 GPT-5.6 Luna**: The base is under immediate infantry pressure and the Construction Yard is nearly destroyed. Power is critically low, so I will prioritize the queued Power Plant and keep repairing the MCV while the War Factory completes the APC; vehicle production must then focus on anti-infantry and survivability.
- **4:16 GPT-5.6 Terra**: Our infantry column has reached the enemy start and their Construction Yard was nearly destroyed; finish it immediately and keep all forces advancing through the base area. Preserve cash for a War Factory as soon as income rises.
- **4:16 GPT-5.6 Luna**: Power is critically low and the base has no combat force, so place the completed power plant immediately, then establish barracks and vehicle production. Keep both harvesters mining while rebuilding toward tanks and scouting the enemy start.
- **4:24 GPT-5.6 Terra**: Our infantry mass is already spread across the enemy start and their visible structures have disappeared, suggesting the base is nearly or fully cleared. Keep continuous infantry production and converge all combat units onto the enemy start to locate and eliminate any remaining buildings.
- **4:24 GPT-5.6 Luna**: The Construction Yard and all production buildings appear to be gone, leaving no way to restore power or produce an army. I will use the two harvesters to scout toward the likely enemy base and attack any exposed targets while preserving whatever score is possible.
- **4:32 GPT-5.6 Terra**: Our infantry mass is already inside the enemy start area and only their refinery remains visible; finish it while continuing the westward sweep. Preserve cash for a War Factory as soon as income reaches $2000.
- **4:32 GPT-5.6 Luna**: Our base has been overrun and no Construction Yard remains, so production and rebuilding are impossible. Send both ore trucks away from the enemy infantry to preserve assets and scout toward the likely enemy base.
- **4:40 GPT-5.6 Terra**: The infantry assault has erased much of the enemy base but no structures remain visible, so I will keep the whole combat force sweeping the known enemy start while preserving funds for a War Factory. Harvesters should remain actively mining.
- **4:40 GPT-5.6 Luna**: All units and buildings have been destroyed, leaving no MCV or production capability. The game is effectively lost; no actionable orders remain.

---
Source: https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt56luna-g1.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms