---
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-g3.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-g3

# GPT-5.6 Terra vs GPT-6 Luna

GPT-5.6 Terra destroyed the enemy base after 5.0 game-minutes · 6.3 min wall clock

Jetty run 2fb81383
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-gpt56terra-gpt6luna-g3.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g3/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g3/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g3/validation_report.json)

WIN germany · west

GPT-5.6 Terra

openai/gpt-5.6-terra

Value destroyed$8,100Value lost$2,400
Units killed / lost23 / 18Buildings killed / lost4 / 0
Peak army$4,400Orders issued77
Decision turns (failed)38 (0)Mean latency3.6sModel cost$0.265

LOSS ukraine · east

GPT-6 Luna

openai/gpt-6-luna

Value destroyed$2,400Value lost$8,100
Units killed / lost18 / 23Buildings killed / lost0 / 4
Peak army$1,600Orders issued27
Decision turns (failed)38 (0)Mean latency3.0sModel cost$0.012

## 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': 38, 'Multi1': 38} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/38', 'Multi1': '0/38'} |
| pass | code\_check | video-decodes | duration 51.9s |
| pass | code\_check | video-complete | video ends at tick 7479 of 7479 |
| pass | code\_check | limits-respected | ended after 6.3 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | summary.md Notes section cites both models final thoughts and explains Terra win via infantry mass overrunning base at tick 7480 |
| pass | checklist | players-match-request | result.json Multi0=gpt56terra (GPT-5.6 Terra) west and Multi1=gpt6luna (GPT-6 Luna) east match the requested players |
| pass | checklist | no-silent-outage | run.log shows 38 consecutive decision turns per player with no gaps all LLM calls 0 failures |

## 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 power-to-refinery opening. The enemy is likely far west, so establish income and infantry production before scouting aggressively.
- **0:00 GPT-6 Luna**: Deploy the MCV immediately, then start the standard Soviet economy with a power plant followed by an ore refinery. Keep the MCV safely at the starting location while the base comes online.
- **0:08 GPT-5.6 Terra**: Construction Yard is deployed and the first power plant must be established immediately. I will start the standard economy opening, then add infantry scouting toward the enemy's likely western start.
- **0:08 GPT-6 Luna**: The Power Plant is still the opening build, so I’ll avoid starting another building before it’s ready. Once placed, I’ll move straight into a Refinery to establish income.
- **0:16 GPT-5.6 Terra**: Construction Yard is deployed with strong starting cash. Place the initial power plant and immediately begin an Ore Refinery to establish income.
- **0:16 GPT-6 Luna**: The Construction Yard is deployed, but there are no units or income yet. Start the Power Plant; once it is placed, prioritize a Refinery for the free harvester.
- **0:24 GPT-5.6 Terra**: Construction Yard and power are established with ample cash. Start the first refinery immediately, then place it and follow with barracks/vehicle tech while scouting west.
- **0:24 GPT-6 Luna**: Place the completed Power Plant, then start an Ore Refinery so the free harvester can begin generating income. Once the refinery is underway, build a barracks for early defense and scouting.
- **0:32 GPT-5.6 Terra**: First refinery is still constructing. Preserve cash for immediate placement and follow with a barracks, then expand vehicle production.
- **0:32 GPT-6 Luna**: The Construction Yard and Power Plant are established, and power is ample. Start an Ore Refinery now to bring in income and gain a harvester; then add a Barracks and expand production.
- **0:40 GPT-5.6 Terra**: Ore Refinery is still under construction; save the building queue until it is ready, then place it immediately and begin a Barracks.
- **0:40 GPT-6 Luna**: The Refinery is already building and power is ample. Let it finish; then place it to gain a free harvester, build a Barracks, and start expanding toward the enemy.
- **0:48 GPT-5.6 Terra**: Ore Refinery is nearly complete; I will place it immediately next turn, then establish barracks and expand the economy. Enemy is expected far west, so early scouting infantry will be needed.
- **0:48 GPT-6 Luna**: The Refinery is already under construction and power is ample. I’ll let it finish, then place it and start a Barracks so I can begin scouting and building an army.
- **0:56 GPT-5.6 Terra**: The first refinery is nearly complete and must be placed immediately to start income. I will follow with a barracks and early infantry scouting toward the likely Soviet start in the west.
- **0:56 GPT-6 Luna**: The Refinery is still building, so the Building queue is occupied. Once it is ready, place it and start a Barracks; there are no units to move or train yet.
- **1:04 GPT-5.6 Terra**: First refinery is ready and must be placed immediately to start income with its free harvester. Barracks construction is underway; once complete, use infantry to scout west toward the likely enemy start while expanding into vehicle production.
- **1:04 GPT-6 Luna**: The Ore Refinery is almost ready, so let it finish; placing it will provide the first harvester and unlock the opening economy. Then I’ll build a Barracks and continue expanding toward the likely enemy start.
- **1:12 GPT-5.6 Terra**: Barracks is nearing completion while the first refinery is operating. I will keep the harvester mining and immediately transition into infantry scouting and a second refinery/war factory once the barracks is placed.
- **1:12 GPT-6 Luna**: Place the ready refinery immediately to gain a free harvester, then start a barracks and begin infantry production once it is available. Power is ample for the opening.
- **1:20 GPT-5.6 Terra**: The barracks is ready and the economy has enough cash to immediately expand to a second refinery. I will establish infantry scouting toward the likely western enemy base while keeping the harvester mining.
- **1:20 GPT-6 Luna**: The barracks is already 64% complete, with ample power and one harvester. Keep the economy working; once the barracks is placed, begin infantry production and expand toward a second refinery and War Factory.
- **1:28 GPT-5.6 Terra**: Second refinery is building and the barracks is ready to begin producing scouts. I will mass infantry immediately, rally them west toward the likely enemy start, then use refinery income for a War Factory.
- **1:28 GPT-6 Luna**: Place the ready barracks, start a War Factory, and begin building a small infantry force to scout toward the enemy. Power is healthy and the first refinery is operating.
- **1:36 GPT-5.6 Terra**: Second refinery is building and infantry queues are fully committed. Scout west toward the likely Soviet start while keeping the harvester mining and rallying new infantry forward.
- **1:36 GPT-6 Luna**: The base is stable on power, with the refinery working and the War Factory under construction. Queue a small infantry scout force toward the likely enemy start, then add another refinery and begin vehicle production as soon as the factory is ready.
- **1:44 GPT-5.6 Terra**: Second refinery is nearly complete; preserve cash for its placement and then immediately start the War Factory. Infantry scouts are advancing west toward the likely Soviet base while production remains queued.
- **1:44 GPT-6 Luna**: The War Factory is underway and power is ample, but one harvester limits income. Queue another refinery, keep the barracks busy, and send the infantry east to scout toward the likely enemy start.
- **1:52 GPT-5.6 Terra**: Second refinery is nearly ready and will strengthen income; immediately follow with power for the coming War Factory. Keep scouting west toward the enemy start while infantry production completes.
- **1:52 GPT-6 Luna**: The War Factory and second Refinery are already in the Building queue; power is sufficient for now. Keep the infantry queue producing anti-armor troops and send the scouts toward the likely enemy base.
- **2:00 GPT-5.6 Terra**: A second refinery is ready and will strengthen income with another harvester. Power is already being added; infantry scouting continues west toward the suspected Soviet base while we save for a War Factory.
- **2:00 GPT-6 Luna**: The War Factory is progressing, with a Refinery queued behind it; power is healthy and the current cash reserve is modest. Keep scouting toward the likely enemy start and maintain Rocket Soldier production so the infantry can handle any vehicles encountered.
- **2:08 GPT-5.6 Terra**: Second refinery is established and power is ready; place it immediately while saving for a War Factory. Consolidate the scouting infantry and rockets into a westbound force toward the likely Soviet start.
- **2:08 GPT-6 Luna**: The War Factory is nearly ready, with a Refinery queued behind it; power is sufficient for now. Send the eastern scouts and forward rocket soldier toward the likely enemy start, while keeping the two rockets at base to guard the harvester and buildings.
- **2:16 GPT-5.6 Terra**: Infantry and rockets are advancing toward the likely enemy start while the economy saves for a War Factory. Keep the attack force moving west and harvesters working; avoid spending until $2000 is available.
- **2:16 GPT-6 Luna**: The War Factory is almost ready, and the Refinery is queued behind it; cash is too low to start anything else. Keep the advancing force moving east toward the likely enemy start while the queued rocket soldiers continue training.
- **2:24 GPT-5.6 Terra**: Our infantry spearhead has reached enemy scouts near the center and should eliminate them while continuing west. Spend current income on rifles, then bank for the War Factory.
- **2:24 GPT-6 Luna**: Place the ready War Factory and push the scattered infantry toward the likely enemy base to explore and engage. Cash is empty, so let the queued rocket soldiers finish and resume vehicle production when ore comes in.
- **2:32 GPT-5.6 Terra**: Our rifle force is already pushing west and has found enemy infantry near the central approach. Keep pressure toward the likely Soviet start while saving incoming refinery income for a War Factory.
- **2:32 GPT-6 Luna**: Our infantry are advancing east and have encountered an enemy rifleman; keep the force moving toward the likely enemy base at (95,11). The refinery is nearly unfunded, so send the harvester back to work and let the queued refinery finish.
- **2:40 GPT-5.6 Terra**: Our two-refinery economy is online but cash is temporarily depleted. Keep the rifle force advancing southwest while continuously producing infantry until we can afford the War Factory.
- **2:40 GPT-6 Luna**: Cash is depleted, so let the Ore Refinery finish and keep the existing production queues running. Advance the infantry toward the likely enemy base, engaging the visible enemy soldiers along the way.
- **2:48 GPT-5.6 Terra**: Our rifle column is advancing toward the enemy start and has encountered a rocket soldier. Keep the force moving west while the queued infantry reinforces; save income for the first War Factory.
- **2:48 GPT-6 Luna**: The second refinery is already building, but cash is nearly exhausted, so avoid starting anything else. Push the rocket soldiers east to scout and engage while the harvester brings in more ore; resume tank production once funds allow.
- **2:56 GPT-5.6 Terra**: Our rifle column is advancing safely toward the likely enemy start, but we need to bank enough income for a War Factory. Keep the infantry pressure moving west while both harvesters continue mining.
- **2:56 GPT-6 Luna**: The refinery is still building and cash is empty, so keep the queued rocket soldier and refinery progressing. Send the lone rocket soldier east toward the likely enemy base to scout, but avoid spending on new structures until ore arrives.
- **3:04 GPT-5.6 Terra**: Our rifle column is advancing toward the likely enemy start while both refineries keep income flowing. I will keep infantry production queued and push all combat units west to scout and engage.
- **3:04 GPT-6 Luna**: Cash is depleted, so the refinery and queued infantry must wait for income. Keep the scout advancing east toward the likely enemy start while the harvester resumes mining.
- **3:12 GPT-5.6 Terra**: The rifle column is deep across the map and should continue toward the likely Soviet start while our two refineries fund the War Factory. Infantry production is already heavily queued, so preserve cash for armor infrastructure.
- **3:12 GPT-6 Luna**: The second refinery is already 35% complete, so prioritize getting it placed to increase income. Keep infantry production moving and send the scout east toward the likely enemy start while the rocket soldier stays near the base to help protect the harvester.
- **3:20 GPT-5.6 Terra**: Our rifle column is deep across the map and should continue pressing toward the likely Soviet start while the two refineries build income. Cash is still too low for the War Factory, so keep the infantry stream moving and wait for funds.
- **3:20 GPT-6 Luna**: The second refinery is still building, and there’s no cash to start anything else. Send the two infantry east to scout toward the likely enemy base while keeping the harvester mining.
- **3:28 GPT-5.6 Terra**: Our rifle column has reached the enemy approach and spotted a defender near (28,21). Keep infantry production continuous and press the entire force toward the likely enemy base while income accumulates for a War Factory.
- **3:28 GPT-6 Luna**: The second refinery is already underway, but cash is depleted, so keep the existing rocket-soldier production moving and avoid starting another costly queue. Send the scout east toward the likely enemy base and keep the harvester mining.
- **3:36 GPT-5.6 Terra**: Our infantry column has reached the enemy ore field and can deny their economy immediately. Keep the barracks rally pointed west and eliminate the exposed harvester while saving for a War Factory.
- **3:36 GPT-6 Luna**: Enemy infantry are close to your harvester, so pull it back toward the base while the nearly finished rocket soldier provides protection. Keep the second refinery and infantry queues running; spend the next income on power if needed, then expand vehicle production.
- **3:44 GPT-5.6 Terra**: Our infantry column has reached the enemy approach and the exposed refinery is the only confirmed target. Keep pressure on it while income converts stored ore into cash for a War Factory and anti-vehicle infantry.
- **3:44 GPT-6 Luna**: The second refinery is already underway, and the nearly complete rocket soldier should help counter the enemy infantry near our base. With no cash and no combat units visible, keep the harvester mining and rally new infantry to defend the base.
- **3:52 GPT-5.6 Terra**: Our rifle force has reached the exposed enemy refinery and should destroy it immediately, then press into the likely base at (12,16). War Factory construction and the infantry queue are already progressing.
- **3:52 GPT-6 Luna**: Enemy infantry are dangerously close to the base, while our cash is empty and the second refinery is already underway. Keep the harvester mining, and rally fresh units toward the threatened approach so the queued rocket soldiers can defend when they emerge.
- **4:00 GPT-5.6 Terra**: Our rifle force is already at the enemy refinery and can finish it immediately, then clear the nearby harvester and continue into the likely base location. War Factory completion is imminent; keep infantry flowing and rally reinforcements straight to the enemy base.
- **4:00 GPT-6 Luna**: Enemy infantry are massed beside the base and threatening the harvester. Cash is exhausted, so let the nearly completed refinery and queued rocket soldiers provide the next options; pull the harvester behind the base meanwhile.
- **4:08 GPT-5.6 Terra**: Our infantry swarm has reached and swept the enemy start area, but no enemy structures are currently visible. Keep pressure around the northwest base location while the War Factory finishes and maintain harvesting.
- **4:08 GPT-6 Luna**: Cash is exhausted, so prioritize restarting ore income while the second refinery finishes. The nearby enemy infantry are a threat; keep the barracks producing rockets to defend the base.
- **4:16 GPT-5.6 Terra**: Our infantry column has reached the exposed enemy base and should focus down the Construction Yard while the War Factory finishes. Cash is committed, so maintain pressure and place the War Factory as soon as it is ready next turn.
- **4:16 GPT-6 Luna**: The enemy infantry mass is dangerously close to the base, but I have no cash and no combat units currently available. Resume harvesting so the refinery and queued rocket soldiers can finish; keep production focused on anti-infantry defense once income returns.
- **4:24 GPT-5.6 Terra**: Our infantry swarm is inside the exposed enemy base, and the Construction Yard is already badly damaged. Focus every combat unit on destroying it immediately, then eliminate the War Factory.
- **4:24 GPT-6 Luna**: The enemy infantry mass is dangerously close, but I have no combat units on the map yet and no cash to start anything new. Let the refinery and queued rocket soldiers complete, and keep the harvester mining so income can resume.
- **4:32 GPT-5.6 Terra**: Our large rifle force is already inside the exposed enemy base, and their Construction Yard is critically damaged. Focus all combat units on eliminating it immediately while keeping infantry production queued; the War Factory will complete soon for vehicle follow-up.
- **4:32 GPT-6 Luna**: The enemy infantry mass is on top of my base and the Construction Yard is at only 11% health. With no cash, I’ll sell the War Factory to fund the nearly finished rocket soldiers, send the harvester mining, and repair the Yard if the sale provides enough.
- **4:40 GPT-5.6 Terra**: Our infantry mass is positioned inside the enemy start area, but the damaged Construction Yard is currently under fog. Keep the entire force aggressively attack-moving through the enemy base to finish remaining structures while the War Factory completes.
- **4:40 GPT-6 Luna**: The Construction Yard and most of the base are gone, and enemy infantry are at our doorstep. Finish the nearly complete rocket soldier, then queue rifle infantry to defend the barracks and keep the harvester mining if it can.
- **4:48 GPT-5.6 Terra**: Our infantry mass is inside the enemy base and the visible barracks and power plant are badly damaged. Focus all combat units on the barracks first, then sweep the base; War Factory will unlock vehicle production shortly.
- **4:48 GPT-6 Luna**: The enemy infantry mass is overwhelming my two riflemen and is threatening the barracks. I’ll focus fire on the weakest nearby enemy while pulling the harvester away from the fight; the existing infantry queue can continue producing defenders.
- **4:56 GPT-5.6 Terra**: Our infantry mass is already at the exposed enemy base and should finish the damaged power plant while the War Factory completes. Keep infantry production flowing and prepare vehicle production immediately after placement.
- **4:56 GPT-6 Luna**: The base is nearly wiped out and the enemy infantry are close, but the harvester is currently away from them. Keep it mining to rebuild cash and repair the surviving power plant if possible.

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Source: https://evaljetty.com/openra/runs/r2-rr-gpt56terra-gpt6luna-g3.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms