---
title: "GPT-5.6 Terra vs GPT-6 Luna | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-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-gpt6luna-g1

# GPT-5.6 Terra vs GPT-6 Luna

GPT-5.6 Terra destroyed the enemy base after 5.3 game-minutes · 6.6 min wall clock

Jetty run 32480780
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-gpt56terra-gpt6luna-g1.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g1/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g1/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g1/validation_report.json)

WIN ukraine · west

GPT-5.6 Terra

openai/gpt-5.6-terra

Value destroyed$8,400Value lost$2,600
Units killed / lost15 / 22Buildings killed / lost4 / 0
Peak army$4,300Orders issued79
Decision turns (failed)40 (0)Mean latency3.6sModel cost$0.283

LOSS russia · east

GPT-6 Luna

openai/gpt-6-luna

Value destroyed$2,600Value lost$8,400
Units killed / lost22 / 15Buildings killed / lost0 / 4
Peak army$1,800Orders issued29
Decision turns (failed)40 (0)Mean latency3.1sModel cost$0.014

## 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': 40, 'Multi1': 40} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/40', 'Multi1': '0/40'} |
| pass | code\_check | video-decodes | duration 54.6s |
| pass | code\_check | video-complete | video ends at tick 7891 of 7891 |
| pass | code\_check | limits-respected | ended after 6.6 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | Notes section cites final thoughts from both models, explaining Terras infantry-swarm push and Lunas economic collapse |
| pass | checklist | players-match-request | result.json records Multi0=gpt56terra (openai/gpt-5.6-terra) and Multi1=gpt6luna (openai/gpt-6-luna) matching the requested players |
| pass | checklist | no-silent-outage | run.log shows 41 consecutive decision-turn lines with no gaps; 0/40 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 begin the standard Soviet economy opening. Enemy is likely far west, so prioritize fast refinery and production setup.
- **0:00 GPT-6 Luna**: Deploy the MCV immediately to establish the Construction Yard, then start the opening power plant. I’ll place it near the base when it’s ready and follow with an Ore Refinery.
- **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 refinery income.
- **0:08 GPT-6 Luna**: The Power Plant is already under construction, so I’ll wait for it to become ready and place it before starting the Ore Refinery. No units are available to move or train yet.
- **0:16 GPT-5.6 Terra**: Construction Yard is deployed with ample starting cash. Start power immediately, then establish refinery income and infantry production while scouting west toward the likely enemy base.
- **0:16 GPT-6 Luna**: Start the power plant, then establish ore income with a refinery as soon as the plant is placed. Keep the opening focused on economy before building the barracks and war factory.
- **0:24 GPT-5.6 Terra**: Deploy the initial power immediately and begin the refinery for income. We need establish economy quickly, then produce infantry scouts toward the western enemy start.
- **0:24 GPT-6 Luna**: Place the ready power plant, then immediately start an Ore Refinery to establish income. The enemy is still unexplored, so prioritize the economy before scouting or building an army.
- **0:32 GPT-5.6 Terra**: Power is established and we need immediate income. Start the first refinery, then establish infantry production as soon as possible.
- **0:32 GPT-6 Luna**: The Construction Yard is deployed and the power plant is placed. Start the first refinery now to establish income; then add a barracks and war factory as soon as the queue allows.
- **0:40 GPT-5.6 Terra**: First refinery is still under construction. I will place it as soon as it completes, then immediately establish barracks and expand ore income.
- **0:40 GPT-6 Luna**: The first refinery is already 23% complete, and power is ample. I’ll let it finish, then place it and build a barracks so I can start producing infantry while planning the next refinery or war factory.
- **0:48 GPT-5.6 Terra**: Refinery is still under construction; I will place it as soon as it is ready, then immediately establish infantry production and expand ore income.
- **0:48 GPT-6 Luna**: The first refinery is already 47% complete, so I’ll let it finish and place it as soon as it’s ready. Then I’ll add a barracks and start building an infantry force while the free harvester brings in ore.
- **0:56 GPT-5.6 Terra**: First refinery is nearly ready; immediately establish infantry production after placing it, then expand the ore economy. Enemy is expected far west, so early scouting infantry will head that direction.
- **0:56 GPT-6 Luna**: The first refinery is still under construction, and there are no units or harvesters yet. I’ll let it finish, then place it and establish infantry production.
- **1:04 GPT-5.6 Terra**: First refinery is almost complete and barracks is queued behind it. Place the refinery immediately to start ore income, then establish infantry production and prepare a second refinery.
- **1:04 GPT-6 Luna**: The refinery is nearly complete; place it as soon as it is ready, then start a barracks. Power is ample, and there are no units or enemy contacts yet.
- **1:12 GPT-5.6 Terra**: First refinery is ready and barracks construction has just begun. Place the refinery immediately, then use the barracks for scouts and establish a second refinery economy.
- **1:12 GPT-6 Luna**: The refinery is ready to place; place it now to gain the free harvester and start income. Then queue a barracks so infantry production can begin once it is placed.
- **1:20 GPT-5.6 Terra**: Barracks is nearly complete and our economy has ample power. Keep the harvester mining, then immediately place the barracks and begin infantry scouting toward the likely western enemy base.
- **1:20 GPT-6 Luna**: The second refinery is placed and the barracks is still building. I’ll try to place it near the base and queue a War Factory for the next opening; keep the harvester mining meanwhile.
- **1:28 GPT-5.6 Terra**: Barracks is ready and the economy has enough cash to expand immediately. I will place it, add a second refinery for a second harvester, and begin producing infantry scouts toward the likely enemy base.
- **1:28 GPT-6 Luna**: The barracks is ready to place, while the War Factory is already in the building queue. Place the barracks and get infantry production started; with plenty of power, prioritize another refinery once the War Factory is placed.
- **1:36 GPT-5.6 Terra**: Second refinery is underway and we have ample power. Train a scouting force while saving toward a War Factory, then send infantry west toward the likely enemy start.
- **1:36 GPT-6 Luna**: 
- **1:44 GPT-5.6 Terra**: Second refinery is nearing completion and infantry production is fully queued. I will scout directly toward the likely Allied start while keeping the harvester working and set the barracks rally west.
- **1:44 GPT-6 Luna**: The War Factory is already under construction, and the base has healthy power. Keep the Barracks producing a small scouting force while the Harvester gathers ore; add a refinery once the War Factory is placed.
- **1:52 GPT-5.6 Terra**: Second refinery is nearly complete; conserve cash for the War Factory immediately afterward while continuing infantry production and scouting west. Rocket and rifle infantry will advance toward the likely enemy start.
- **1:52 GPT-6 Luna**: The War Factory is nearly ready, and power is healthy. Send the available infantry east to scout while continuing infantry production; start a second refinery as soon as the War Factory finishes.
- **2:00 GPT-5.6 Terra**: Second refinery is nearly ready and will strengthen the economy. Current scouts should continue west toward the likely enemy base while infantry production completes; immediately transition into a War Factory once funds allow.
- **2:00 GPT-6 Luna**: The War Factory is nearly complete, and power is healthy. Queue a second Refinery for income, keep the infantry production moving, and send the scouts farther east toward the likely enemy base.
- **2:08 GPT-5.6 Terra**: Second refinery is ready and should be placed immediately to boost income. I will add power for the coming war factory, keep infantry production active, and continue the western scout toward the likely enemy base.
- **2:08 GPT-6 Luna**: The War Factory is nearly complete and the second Refinery is queued behind it; power is sufficient for now. Keep infantry production running and push the eastern scouts toward the likely enemy start to reveal the base.
- **2:16 GPT-5.6 Terra**: Second refinery is operating and the ready power plant should be placed immediately to support a War Factory. Our infantry/rocket scouting column is advancing west toward the likely enemy base; keep it moving and engage anything found.
- **2:16 GPT-6 Luna**: The War Factory is nearly ready and the Refinery is next in the building queue. Keep the exposed infantry scouting east toward the likely enemy start; once the War Factory is placed, shift production to tanks when funds allow.
- **2:24 GPT-5.6 Terra**: Our scouting column has reached and spotted an enemy rifleman, confirming the western route. Keep the infantry pressure moving toward the likely base while income accumulates for a War Factory.
- **2:24 GPT-6 Luna**: Place the ready War Factory so vehicle production can begin, then push the scouting force east toward the likely enemy start. Cash is too low for a tank now, so keep existing infantry production running while the harvester gathers ore.
- **2:32 GPT-5.6 Terra**: Our infantry spearhead is engaging enemy scouts and continues toward the likely western base. Keep pressure while ore trucks return funds, then immediately start a War Factory.
- **2:32 GPT-6 Luna**: The refinery is still building and cash is nearly exhausted, so keep the harvester mining and let production finish. Our scouts have contacted a small enemy infantry group; advance the army through them toward the likely enemy base.
- **2:40 GPT-5.6 Terra**: Our infantry screen is advancing toward the likely Allied base, but we need cash flow to reach a War Factory. Keep pressure on the visible rocket soldier while continuously expanding the rifle force.
- **2:40 GPT-6 Luna**: The refinery is still building and cash is nearly exhausted, so keep the harvester mining and avoid starting unaffordable production. My rocket soldiers are scattered along the eastern scouting route; send them toward the visible enemy infantry and continue advancing toward the likely enemy base.
- **2:48 GPT-5.6 Terra**: Our infantry column is advancing toward the likely western enemy start, but we still need to locate the base. Keep infantry production running and concentrate the whole force on an aggressive westward sweep while income accumulates for a War Factory.
- **2:48 GPT-6 Luna**: The second refinery and rocket soldier are already in production, but cash is exhausted. Keep the harvester mining and send the scattered rockets east to scout and engage toward the likely enemy start.
- **2:56 GPT-5.6 Terra**: Our infantry screen is advancing successfully toward the likely enemy base while the economy accumulates for a War Factory. Keep the rifles moving west and both harvesters mining; spend on the War Factory as soon as funds permit.
- **2:56 GPT-6 Luna**: Cash is exhausted, so keep the current refinery and infantry queues running while the harvester brings in ore. I’ll avoid sending the lone rocket soldier into enemy territory unsupported.
- **3:04 GPT-5.6 Terra**: Our rifle mass is advancing toward the likely enemy start while both harvesters sustain income. Keep pressure and save through the current infantry queue toward a War Factory.
- **3:04 GPT-6 Luna**: Cash is empty, so the refinery and infantry queues need ore income before they can progress. Send the harvester back to mining and keep the lone rocket soldier safe while the second refinery finishes.
- **3:12 GPT-5.6 Terra**: Rifle column is at the enemy approach and can eliminate the exposed rocket soldier while continuing to scout the likely base location. Preserve funds for the War Factory as refinery income converts the stored ore.
- **3:12 GPT-6 Luna**: Cash is exhausted while the second refinery and rifle infantry remain in production. Pull the badly damaged rocket soldier back toward the base and keep the harvester mining so production can resume.
- **3:20 GPT-5.6 Terra**: Our rifle column has reached the enemy’s likely start area and can pressure the exposed harvester while continuing west. Income needs to accumulate for a War Factory; keep barracks production active in the meantime.
- **3:20 GPT-6 Luna**: Enemy infantry are already threatening the base, so reinforce from the barracks and engage them with our available rifleman. The second refinery is still in progress; keep the harvester mining and prioritize getting production online as ore comes in.
- **3:28 GPT-5.6 Terra**: Our rifle mass is already at the enemy refinery and no enemy defenders are visible. Start the War Factory immediately while the infantry focuses down the exposed refinery and continues into the enemy start.
- **3:28 GPT-6 Luna**: Eight enemy infantry are clustered near my base, while I have only one rifleman available and no cash. Avoid feeding him into the group; keep him defending the base while the refinery and queued production generate resources.
- **3:36 GPT-5.6 Terra**: Our infantry column has reached the enemy approach and the exposed refinery is the immediate target. Keep all combat units focused on destroying it while the War Factory completes; then place it and transition into nonstop armor production.
- **3:36 GPT-6 Luna**: The enemy infantry are already pressing the base, but the refinery is nearly complete and the barracks has reinforcements queued. Have the lone rifleman finish the nearly destroyed attacker while the harvester keeps mining; avoid spending cash we do not have.
- **3:44 GPT-5.6 Terra**: Our infantry column is at the enemy refinery and should finish it while continuing pressure into the likely base at (12,16). War Factory is nearing completion; conserve income for vehicle production once available.
- **3:44 GPT-6 Luna**: The enemy infantry outnumber our four riflemen, so keep them together and engage the nearest enemy while reinforcements finish training. The harvester is nearby; send it back to mining and preserve the economy.
- **3:52 GPT-5.6 Terra**: Our infantry column is at the enemy approach and the refinery/core should be immediately west. Keep infantry production running, finish the War Factory, and force the whole column through the suspected base location.
- **3:52 GPT-6 Luna**: The refinery is nearly destroyed and the enemy infantry are threatening the base. Focus the riflemen on the visible attackers and repair the refinery as soon as resources allow.
- **4:00 GPT-5.6 Terra**: Our infantry column is pushing directly into the exposed enemy start area, where their refinery was previously damaged. Keep the pressure on while income finishes the War Factory and sustains rifle production.
- **4:00 GPT-6 Luna**: The enemy infantry are close to my base, but my only combat unit is damaged and cannot safely take both on alone. Keep the harvester mining so the nearly completed refinery can finish, and use the rifleman to engage the weakened enemy infantry.
- **4:08 GPT-5.6 Terra**: Our infantry column has reached the enemy Construction Yard area, while the War Factory is nearly ready. Focus fire the visible enemy base building and immediately place the War Factory when completed.
- **4:08 GPT-6 Luna**: The refinery is nearly ready, but cash is exhausted and enemy infantry are already near the base. Keep infantry production running, finish the refinery to restore income, and send the harvester back to mine rather than into the fight.
- **4:16 GPT-5.6 Terra**: Our infantry column is already deep across the map and the exposed enemy Construction Yard is the immediate win target. Keep all surviving combat troops focused on it while the two harvesters maintain income for the War Factory completion.
- **4:16 GPT-6 Luna**: The enemy infantry is pressing directly against the base, but I have no combat units yet and no cash to add production. The refinery is nearly complete; keep the harvester mining and rally the barracks’ queued troops toward the threat as they emerge.
- **4:24 GPT-5.6 Terra**: Our infantry are at the enemy Construction Yard and it is heavily damaged; concentrate every available rifleman on it for an immediate win. The War Factory is nearly ready and should be placed as soon as funds permit its completion.
- **4:24 GPT-6 Luna**: The enemy infantry is dangerously close to my base, and I have no combat units in the field. Cash is exhausted, so I’ll keep the existing production queues running and direct barracks reinforcements toward the threat; the refinery should soon restore income.
- **4:32 GPT-5.6 Terra**: The enemy Construction Yard is exposed at 41% health and our infantry are already surrounding it; finish it immediately. War Factory will complete shortly, then place it and transition into tank production as funds arrive.
- **4:32 GPT-6 Luna**: A large enemy infantry group is already at our base, while I have no combat units and no cash. Keep the harvester mining and direct any infantry that completes toward the threat; avoid adding costs until income resumes.
- **4:40 GPT-5.6 Terra**: Our infantry swarm is inside the enemy base and the Construction Yard is nearly destroyed. Place the War Factory immediately, keep expanding income, and redirect the force onto the exposed enemy War Factory.
- **4:40 GPT-6 Luna**: The enemy infantry mass is on top of my base, while I have no combat units and no cash. Keep the refinery and infantry queues progressing, send the harvester mining, and rally any troops produced toward the attackers.
- **4:48 GPT-5.6 Terra**: Our infantry have reached the enemy base and their Construction Yard is nearly destroyed. Place the ready War Factory immediately, keep pressure on both visible enemy buildings, and let the refinery finish for sustained production.
- **4:48 GPT-6 Luna**: The enemy infantry mass is at our doorstep and the Construction Yard is critically damaged, but I have no cash or combat units available yet. Keep the harvester mining and rally newly produced infantry into the threatened base area; the queued infantry should provide our immediate defense.
- **4:56 GPT-5.6 Terra**: The enemy Construction Yard and War Factory are critically damaged and our infantry column is already at their doorstep. Focus all combat units on eliminating both visible buildings while the refinery completes to restart spending.
- **4:56 GPT-6 Luna**: The enemy infantry mass is at our doorstep while we have no combat units in the field and no cash. Keep the Construction Yard alive, get the harvester mining, and direct incoming infantry into the attackers; prioritize rockets against any vehicles later.
- **5:04 GPT-5.6 Terra**: Our infantry swarm is inside the enemy start area and should finish the remaining damaged enemy structures. The refinery is still under construction; keep pressure on the enemy base while income recovers.
- **5:04 GPT-6 Luna**: The base is critically depleted: there is no cash and only a harvester, while enemy infantry are close by. Send the harvester to mine so income can resume; avoid exposing it to the nearby enemy group.
- **5:12 GPT-5.6 Terra**: Our infantry swarm is already inside the exposed enemy base and can finish the remaining visible structures. Keep pressure on the enemy start while the refinery completes to restore spending capacity.
- **5:12 GPT-6 Luna**: The base is nearly wiped out: there is no refinery, cash, or combat force, and a large enemy infantry group is at the doorstep. Sell the barracks to salvage funds and use the harvester to escape the immediate threat.

---
Source: https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g1.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms