---
title: "GPT-6 Luna vs GPT-5.6 Terra | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g2.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-g2

# GPT-6 Luna vs GPT-5.6 Terra

GPT-5.6 Terra destroyed the enemy base after 4.2 game-minutes · 7.3 min wall clock

Jetty run 3db77847
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-gpt56terra-gpt6luna-g2.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g2/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g2/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g2/validation_report.json)

LOSS russia · west

GPT-6 Luna

openai/gpt-6-luna

Value destroyed$100Value lost$8,300
Units killed / lost1 / 13Buildings killed / lost0 / 5
Peak army$1,300Orders issued33
Decision turns (failed)32 (0)Mean latency3.1sModel cost$0.010

WIN ukraine · east

GPT-5.6 Terra

openai/gpt-5.6-terra

Value destroyed$8,300Value lost$100
Units killed / lost13 / 1Buildings killed / lost5 / 0
Peak army$5,900Orders issued72
Decision turns (failed)32 (0)Mean latency3.5sModel cost$0.218

## Evaluation

passchecks **7/7** verdict computed from the gating checks

| Status | Kind | Check | Detail |
| --- | --- | --- | --- |
| 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 | 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': 32, 'Multi1': 32} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/32', 'Multi1': '0/32'} |
| pass | code\_check | video-decodes | duration 43.9s |
| pass | code\_check | video-complete | video ends at tick 6279 of 6279 |
| pass | code\_check | limits-respected | ended after 7.3 wall-minutes (budget 30.0 min): base destroyed |

## 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-6 Luna**: Deploy the MCV immediately, then start the standard Soviet power-and-refinery opening. I’ll place each building as soon as it is ready and keep production moving toward a war factory and armor.
- **0:00 GPT-5.6 Terra**: Deploy immediately and begin the standard Soviet economy opening with power followed by a refinery.
- **0:08 GPT-6 Luna**: The Power Plant is already in the Building queue, so I’ll let it finish before starting the Ore Refinery. No units are available yet; once the economy is online, I’ll build a force and push west toward the likely enemy start.
- **0:08 GPT-5.6 Terra**: Construction Yard is deployed and the first power plant is building. I will place it as soon as ready, then immediately establish refinery income.
- **0:16 GPT-6 Luna**: Deploy the MCV immediately and begin the standard Soviet economy. Start a power plant, then follow with a refinery and barracks so mining and unit production can come online.
- **0:16 GPT-5.6 Terra**: Construction Yard is deployed with ample starting cash. Begin the standard power and refinery opening immediately.
- **0:24 GPT-6 Luna**: The MCV is still undeployed, so establish the Construction Yard first, then begin the power plant and refinery opening. Keep the building queue moving as soon as each structure is ready.
- **0:24 GPT-5.6 Terra**: Deploy the initial power immediately and begin the first refinery to establish income. Then add barracks and a second refinery while scouting toward the likely enemy position.
- **0:32 GPT-6 Luna**: The MCV is deployed and the Construction Yard is ready to start the economy. Build a Power Plant first; once it is ready, place it and begin the Ore Refinery.
- **0:32 GPT-5.6 Terra**: Initial power is online and the priority is starting ore income immediately. I will begin a refinery, then place it and add barracks for scouting infantry.
- **0:40 GPT-6 Luna**: Place the ready power plant, then start an ore refinery so income and a free harvester come online. Once the refinery is placed, I’ll establish infantry production and scout toward the likely enemy base to the west.
- **0:40 GPT-5.6 Terra**: Refinery is still under construction. I will place it immediately when ready, then establish barracks and a second refinery for a strong Soviet economy.
- **0:48 GPT-6 Luna**: Place the ready power plant, then start a refinery to establish income and gain a free harvester. Once it is placed, build a barracks and scout west toward the likely enemy start.
- **0:48 GPT-5.6 Terra**: Refinery is nearly complete; place it immediately when ready and use its free harvester to establish income. Then add barracks and a second refinery while scouting east with infantry.
- **0:56 GPT-6 Luna**: The refinery is already under construction, and power is ample. Let it finish; then place it to gain a harvester and start a barracks for scouting and defense.
- **0:56 GPT-5.6 Terra**: The first refinery is nearly complete, so I will immediately place it when ready and use the income to establish infantry production and a second refinery. No enemy contact yet; scouting will begin with the first troops.
- **1:04 GPT-6 Luna**: The refinery is already nearly halfway through construction, so let it finish before starting the barracks. Once it is ready, place it to gain a harvester and get infantry production and scouting underway.
- **1:04 GPT-5.6 Terra**: The first refinery is nearly complete; it must be placed to start income and unlock the opening army. I will place it immediately and transition into barracks production next turn.
- **1:12 GPT-6 Luna**: The refinery is still under construction, so I can’t place it or start another building yet. Once it’s ready, I’ll place it, then build a barracks and scout toward the enemy start.
- **1:12 GPT-5.6 Terra**: The refinery is ready and must be placed immediately to start income. I will follow with barracks and begin infantry scouting toward the likely eastern enemy position.
- **1:20 GPT-6 Luna**: The refinery is nearly complete, and power is ample. Place it as soon as it finishes, then establish infantry production while the free harvester begins mining.
- **1:20 GPT-5.6 Terra**: Barracks is nearly complete; keep the existing harvester actively mining and immediately expand into a second refinery once the barracks is placed. Infantry will scout east toward the likely enemy position.
- **1:28 GPT-6 Luna**: The refinery is ready to place; get it down to start income, then begin a barracks. With no units yet, prioritize establishing the economy and production.
- **1:28 GPT-5.6 Terra**: Barracks is ready and economy has ample power for a second refinery. I will place it, expand ore income immediately, and begin infantry scouting toward the likely enemy position.
- **1:36 GPT-6 Luna**: The refinery is placed and the barracks is 64% complete; power is healthy and the harvester is working. I’ll let the barracks finish, then place it and start producing infantry while adding a second refinery for income.
- **1:36 GPT-5.6 Terra**: Second refinery is underway, and the barracks is now operational. I will begin continuous infantry production for scouting and map control, then transition into a War Factory as soon as the refinery is placed.
- **1:44 GPT-6 Luna**: Place the ready barracks, then start a second refinery to grow income. Once the barracks is placed, train a small infantry scout force toward the likely enemy start.
- **1:44 GPT-5.6 Terra**: Second refinery is nearing completion; preserve cash to place it and immediately begin a War Factory. Existing rifles will scout east and northeast toward the likely enemy base while new infantry accumulates.
- **1:52 GPT-6 Luna**: The second refinery is already building, so keep the barracks producing while it finishes. Once the refinery is placed, prioritize a War Factory and start building a tank force toward the enemy’s likely base.
- **1:52 GPT-5.6 Terra**: Second refinery is nearing completion and infantry production is queued. I will scout aggressively toward the likely eastern enemy position while preserving a small home screen, then place the refinery and begin a War Factory immediately.
- **2:00 GPT-6 Luna**: The second refinery is underway, and power is comfortably positive. Keep infantry production moving, scout west toward the likely enemy start, and build a War Factory as soon as the refinery is placed.
- **2:00 GPT-5.6 Terra**: Second refinery and current rifleman are nearly complete, giving a stronger income base for a War Factory immediately afterward. Infantry will continue advancing toward the likely enemy start while preserving a cohesive scouting force.
- **2:08 GPT-6 Luna**: The second refinery is nearly ready, and power is sufficient for now. Queue a War Factory behind it, keep infantry production moving, and send the western scouts onward toward the likely enemy base.
- **2:08 GPT-5.6 Terra**: Second refinery is ready and must be placed immediately to accelerate income. Infantry will continue probing toward the likely enemy base while barracks production shifts toward rockets for future armor support.
- **2:16 GPT-6 Luna**: The second refinery is nearly ready, and the War Factory is queued behind it. Send the scouting infantry west toward the likely enemy start while keeping the rocket soldier near home; continue rocket production as funds allow.
- **2:16 GPT-5.6 Terra**: Our infantry screen is advancing toward the likely enemy base while the economy supports expansion. Add power now so a War Factory can be started immediately once funds arrive, and keep infantry production flowing.
- **2:24 GPT-6 Luna**: Place the ready refinery to add income, then let the War Factory follow in the building queue. Keep the rifle scouts pushing west toward the likely enemy start while the rocket soldiers stay near home; infantry production is already queued.
- **2:24 GPT-5.6 Terra**: Place the ready power plant to preserve power capacity, while the infantry spearhead continues toward the likely enemy base in the northeast. Keep the barracks queue active and save income toward a War Factory.
- **2:32 GPT-6 Luna**: The second refinery is placed and the War Factory is progressing; power is adequate, but cash is low. Send the four rocket soldiers west to scout toward the likely enemy start while the queued infantry continues production.
- **2:32 GPT-5.6 Terra**: Infantry production is queued and the main rifle force is advancing toward the likely enemy start. Preserve cash for a War Factory while keeping the spearhead moving and harvesters working.
- **2:40 GPT-6 Luna**: The War Factory is underway and the Rocket Soldiers are scouting west, but cash is nearly exhausted. Keep both harvesters mining and push the scouts toward the likely enemy start while production finishes.
- **2:40 GPT-5.6 Terra**: Our infantry spearhead is advancing unopposed toward the likely enemy start, while two refineries provide a stable early economy. Keep infantry production queued and push the forward force directly northeast toward the enemy base area.
- **2:48 GPT-6 Luna**: The War Factory is underway and the barracks already has units queued, but there’s no spendable cash right now. Send the surviving Rocket Soldier west to scout toward the likely enemy start and set the barracks rally point that way.
- **2:48 GPT-5.6 Terra**: Our infantry spearhead is nearing the likely enemy side with no opposition seen. Preserve cash for a War Factory while continuously producing infantry and push all combat units east toward the suspected enemy base.
- **2:56 GPT-6 Luna**: The War Factory is already 53% built, but cash and stored ore are both at zero, so I should keep the harvesters mining and avoid starting anything I can’t afford. Send the two infantry west to scout toward the likely enemy start.
- **2:56 GPT-5.6 Terra**: Our infantry spearhead is at the enemy’s likely start, while the long column continues to reinforce. Preserve cash for a War Factory as ore converts, and probe aggressively for the enemy base.
- **3:04 GPT-6 Luna**: Seven enemy riflemen are already near the base, while I have no combat units and no cash. Keep both harvesters mining, finish the War Factory, and queue infantry so new units can reinforce as income arrives.
- **3:04 GPT-5.6 Terra**: Our infantry spearhead is nearing the likely enemy start with no resistance visible. Keep them advancing and harvesting while saving income for a War Factory.
- **3:12 GPT-6 Luna**: The enemy infantry mass is dangerously close, while low power is slowing production. Keep the War Factory underway, queue a Power Plant next, and add rocket soldiers after the queued rifles to counter the infantry.
- **3:12 GPT-5.6 Terra**: Our infantry spearhead has reached the enemy start area but has not yet revealed structures. Keep pressure on the likely base location while maintaining nonstop rifle production and saving for a War Factory.
- **3:20 GPT-6 Luna**: Enemy infantry are massed directly beside the base, while low power and empty cash leave us exposed. Keep the War Factory and Power Plant progressing, send both harvesters back to mine, and rally new troops toward the attackers.
- **3:20 GPT-5.6 Terra**: Infantry pressure has reached the enemy start area but no structures are currently visible, so all combat troops will continue sweeping and attacking there. Economy is stable with two refineries; save incoming cash for the first War Factory while the barracks finishes its rifle queue.
- **3:28 GPT-6 Luna**: A large enemy infantry force is already at the edge of my base, while low power and empty cash leave me exposed. Keep both harvesters mining and let the queued War Factory and Power Plant complete; the Rocket Soldiers in production are the best available response to the infantry mass.
- **3:28 GPT-5.6 Terra**: Our infantry spearhead is nearing the likely enemy start with no resistance spotted. Keep all combat units advancing and preserve cash for the first War Factory as ore income arrives.
- **3:36 GPT-6 Luna**: A large enemy infantry force is pressing directly against the base, while low power and damaged buildings threaten production. I’ll use the rocket soldier to defend, keep the nearby harvester mining, and repair the refinery as resources come in.
- **3:36 GPT-5.6 Terra**: Our forward infantry has reached the enemy refinery and should finish it immediately while the reinforcements keep advancing. Preserve cash for a War Factory; continue rifle production to maintain pressure.
- **3:44 GPT-6 Luna**: Enemy infantry is massed directly beside the Construction Yard, and I have no combat units. Keep both harvesters mining so the queued War Factory and Power Plant can finish; then prioritize power and vehicle production.
- **3:44 GPT-5.6 Terra**: Our infantry swarm is inside the confirmed enemy start and their refinery was nearly destroyed. Keep all combat units pressing the enemy base while the economy accumulates enough cash for a War Factory.
- **3:52 GPT-6 Luna**: The enemy infantry is at the doorstep and I have no combat units, so the harvesters should retreat rather than engage. Keep the Power Plant queued to restore production; place the War Factory as soon as it is ready.
- **3:52 GPT-5.6 Terra**: Our infantry spearhead is at the exposed enemy Construction Yard, which is already heavily damaged and no enemy defenders are visible. Focus all combat units on destroying it immediately while saving income for a War Factory.
- **4:00 GPT-6 Luna**: The Construction Yard and all production buildings are gone, so I can’t rebuild or train an army. Keep both harvesters mining and try to preserve them while I look for a way to recover.
- **4:00 GPT-5.6 Terra**: Our infantry force has reached the enemy start area and the previously damaged Construction Yard is no longer visible, so keep pressure on that location to finish or reveal remaining structures. Continue rifle production and save for a War Factory.
- **4:08 GPT-6 Luna**: The base is in immediate danger: 21 enemy infantry are beside the damaged refinery, and I have no Construction Yard or combat units. I’ll send both harvesters away from the enemy cluster to preserve them and keep them mining if they can escape.
- **4:08 GPT-5.6 Terra**: Our infantry force has reached the enemy start and a damaged refinery is exposed, indicating the base is nearly cleared or just beyond vision. Spend into a War Factory and keep infantry production active while all combat troops finish the refinery and sweep the area.

---
Source: https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g2.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms