---
title: "GPT-5.6 Luna vs GPT-6 Luna | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g1.html
description: "GPT-5.6 Luna 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-gpt56luna-gpt6luna-g1

# GPT-5.6 Luna vs GPT-6 Luna

GPT-5.6 Luna destroyed the enemy base after 5.8 game-minutes · 7.9 min wall clock

Jetty run 1f7d0b82
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-gpt56luna-gpt6luna-g1.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g1/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g1/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g1/validation_report.json)

WIN england · west

GPT-5.6 Luna

openai/gpt-5.6-luna

Value destroyed$8,700Value lost$1,000
Units killed / lost10 / 6Buildings killed / lost6 / 0
Peak army$3,100Orders issued55
Decision turns (failed)44 (0)Mean latency3.5sModel cost$0.034

LOSS germany · east

GPT-6 Luna

openai/gpt-6-luna

Value destroyed$1,000Value lost$8,700
Units killed / lost6 / 10Buildings killed / lost0 / 6
Peak army$1,500Orders issued28
Decision turns (failed)44 (0)Mean latency3.0sModel cost$0.015

## 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 | gpt56luna won: base destroyed |
| pass | code\_check | decisions-logged | turns per slot: {'Multi0': 44, 'Multi1': 44} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/44', 'Multi1': '0/44'} |
| pass | code\_check | video-decodes | duration 60.0s |
| pass | code\_check | video-complete | video ends at tick 8695 of 8695 |
| pass | code\_check | limits-respected | ended after 7.9 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | summary.md Notes section explains GPT-5.6 Luna win by base destruction, citing final thoughts of both models |
| pass | checklist | players-match-request | result.json shows Multi0=gpt56luna (GPT-5.6 Luna) and Multi1=gpt6luna (GPT-6 Luna) matching the requested players |
| pass | checklist | no-silent-outage | run.log shows 44 successful turns per player with no gaps or failed turns; llm\_failures are 0 for both slots |

## 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 Luna**: Deploy the MCV immediately, then begin the standard Allied economy with a Power Plant. After placement, build a refinery and barracks while scouting toward the likely enemy start.
- **0:00 GPT-6 Luna**: Deploy the MCV immediately, then begin the standard economy opening with a Power Plant. The enemy is likely far to the east; focus on establishing a refinery and production before scouting.
- **0:08 GPT-5.6 Luna**: The MCV is deployed and the power plant construction is underway. Place it as soon as ready, then start the refinery to establish income and follow with a barracks.
- **0:08 GPT-6 Luna**: The Construction Yard is deployed and the first Power Plant is underway. Place it as soon as it is ready, then start the Ore Refinery to establish income.
- **0:16 GPT-5.6 Luna**: Deploy the MCV, start the power plant, and expand the base economy toward the likely enemy at the west. Once the plant is ready, place it and immediately begin the refinery.
- **0:16 GPT-6 Luna**: The MCV is still undeployed, so establish the Construction Yard first. Then start the Power Plant; once it is ready, place it and begin the Refinery.
- **0:24 GPT-5.6 Luna**: The Construction Yard is deployed and the first power plant is ready. Place it, then start an Ore Refinery immediately to establish income; continue toward barracks and vehicle production once the refinery is placed.
- **0:24 GPT-6 Luna**: There is no Construction Yard yet, so the previous deploy order did not deploy the visible MCV. Deploy it now; the power plant is already queued and can be placed once ready.
- **0:32 GPT-5.6 Luna**: The base is deployed with power online and $4700 available. Start the refinery immediately, then add barracks and a second refinery or war factory while keeping production active.
- **0:32 GPT-6 Luna**: The Construction Yard is deployed, but there is no power or income yet. Start the standard economy opening with a Power Plant, then place it and build an Ore Refinery.
- **0:40 GPT-5.6 Luna**: The refinery is still under construction and should be placed as soon as it completes. Power is sufficient, so I will wait for placement rather than start another building.
- **0:40 GPT-6 Luna**: Place the ready power plant, then start a refinery to establish income. Once the refinery is placed, build a barracks and begin producing infantry to scout and defend.
- **0:48 GPT-5.6 Luna**: The Ore Refinery is still under construction, so no placement or additional building can begin yet. I will let it finish and place it near the Construction Yard next turn, then start infantry production and scouting.
- **0:48 GPT-6 Luna**: Place the ready power plant, then start the refinery for income and its free harvester. Once the refinery is placed, build a barracks and begin assembling an army.
- **0:56 GPT-5.6 Luna**: The refinery is nearly ready; place it beside the Construction Yard, then start a barracks and produce infantry for scouting and early pressure toward the likely enemy base.
- **0:56 GPT-6 Luna**: The Ore Refinery is already building and power is sufficient, so let it finish. Place it when ready, then start a barracks and begin producing infantry while planning the next refinery or War Factory.
- **1:04 GPT-5.6 Luna**: The refinery is nearly complete; place it immediately to start income, then finish the barracks and begin infantry scouting toward the likely enemy base. Power is currently sufficient, so prioritize economy and infantry production.
- **1:04 GPT-6 Luna**: The Ore Refinery is already under construction and power is ample. Let it finish; then place it and start a Barracks so I can begin producing units.
- **1:12 GPT-5.6 Luna**: Place the ready refinery to start income. The barracks is already queued, so keep it completing and then use it for continuous westward scouting; add a war factory after the barracks for tank production.
- **1:12 GPT-6 Luna**: The refinery is nearly complete, and the current power supply is ample. Place it as soon as it finishes, then start a barracks and begin building an army.
- **1:20 GPT-5.6 Luna**: The barracks is nearly complete; place it when ready, then immediately start a War Factory and begin tank production. Keep the harvester mining and prepare an infantry scout toward the likely western enemy base.
- **1:20 GPT-6 Luna**: The refinery is nearly ready, and the barracks is queued behind it. Place the refinery as soon as it completes; then let the barracks finish and start infantry production next turn.
- **1:28 GPT-5.6 Luna**: Place the ready barracks so infantry production can begin, while the War Factory continues construction. Start a scouting infantry group and rally it west toward the likely enemy base.
- **1:28 GPT-6 Luna**: The refinery is reported ready to place, so I’ll try auto-placement and keep the queued barracks progressing. Once the refinery is down, its free harvester will start the economy.
- **1:36 GPT-5.6 Luna**: The War Factory is nearly ready, while the barracks is built but not placed. Place the barracks now, start a small rifle scout force, and queue a second refinery behind the War Factory to strengthen the economy.
- **1:36 GPT-6 Luna**: Place the ready power plant to keep the base powered; the barracks is already in the building queue. Once it is ready, start infantry production and build a War Factory for an armored force.
- **1:44 GPT-5.6 Luna**: Place the ready barracks, keep infantry production running, and send the initial riflemen west to scout toward the likely enemy base. Maintain the refinery/war factory build queue and add rocket soldiers once the barracks queue allows.
- **1:44 GPT-6 Luna**: The barracks is still building, and power is comfortably positive. I’ll queue another refinery for a second harvester, then establish vehicle production and send the first units toward the likely enemy start.
- **1:52 GPT-5.6 Luna**: War Factory is nearly ready; place it next turn, then complete the queued second refinery for stronger income. Keep rocket production running and send the rifle scouts west toward the likely enemy start.
- **1:52 GPT-6 Luna**: Place the ready barracks so infantry production can begin, and keep the refinery construction moving. Power is ample; the next priority after the refinery is a War Factory for tanks and a second harvester.
- **2:00 GPT-5.6 Luna**: The War Factory is nearly ready and the refinery is queued behind it; keep infantry production running while scouting aggressively toward the likely enemy base. Send the existing screen west and continue rocket production.
- **2:00 GPT-6 Luna**: The War Factory is still building, with a refinery queued behind it; power is ample and the harvester is working. Use the available Barracks to start infantry production while the economy and vehicle production come online.
- **2:08 GPT-5.6 Luna**: War Factory is nearly complete and the second Refinery is queued, so I will keep the economy and vehicle production ramping. Send the current combat force west toward the likely enemy start while continuing rocket production.
- **2:08 GPT-6 Luna**: War Factory is underway with a Refinery queued behind it, and power is ample. Keep infantry production moving while the small group scouts east toward the likely enemy start; switch to tank production once the War Factory is placed.
- **2:16 GPT-5.6 Luna**: War Factory is nearly ready; place it immediately, then let the queued Refinery follow when funds arrive. Keep the scouting force moving toward the likely enemy base at (12,16) while rocket production continues.
- **2:16 GPT-6 Luna**: The War Factory is nearly complete, and a second Refinery is queued behind it; power is ample for now. Keep rocket infantry coming and scout toward the likely enemy base while the new economy and vehicle production come online.
- **2:24 GPT-5.6 Luna**: The forward infantry group is scouting west toward the likely enemy base, while the economy is currently cash-starved. Place the ready War Factory near the base and keep the army advancing; existing rocket production should continue as ore arrives.
- **2:24 GPT-6 Luna**: The War Factory is nearing completion, with a Refinery queued behind it; cash is too low to start another structure or tank production yet. Send the infantry east to scout toward the likely enemy base, and keep the harvester mining.
- **2:32 GPT-5.6 Luna**: The western combat group is nearing two enemy riflemen; continue the attack toward the likely enemy base. The refinery is still building and cash is empty, so preserve the current economy while keeping the army moving.
- **2:32 GPT-6 Luna**: The War Factory is nearly ready, with a Refinery queued behind it; power is ample but cash is low, so avoid adding costly production orders. Send the infantry east toward the likely enemy start to scout and engage along the way.
- **2:40 GPT-5.6 Luna**: The western attack group is closing on the likely enemy base, with one damaged rifleman and a visible damaged enemy infantry unit. Keep pressure moving west, send the harvester back to ore, and leave current rocket production running until income arrives.
- **2:40 GPT-6 Luna**: The War Factory is nearly ready, with a second Refinery queued behind it; power is sufficient, but cash is critically low. Keep the harvester mining and send the healthier rocket soldiers east to scout while leaving the badly damaged rifleman out of danger.
- **2:48 GPT-5.6 Luna**: The second refinery is nearly complete, while the army continues probing west toward the likely enemy base. Keep all rocket and rifle units advancing, send the harvester back to ore, and maintain production pressure.
- **2:48 GPT-6 Luna**: Place the ready War Factory and push the rocket squad east to scout and engage; the Refinery is already queued, but production is cash-starved until the harvester brings in ore.
- **2:56 GPT-5.6 Luna**: The forward rocket group is near the enemy refinery and should destroy it while avoiding dispersion. The second refinery is nearly complete; keep infantry production active and begin tank production as ore arrives.
- **2:56 GPT-6 Luna**: Cash and stored ore are both depleted, so prioritize getting the harvester back to work and avoid starting more costly production. Enemy infantry are close to our troops; engage them locally, while the badly damaged rocket soldier stays out of the fight.
- **3:04 GPT-5.6 Luna**: The forward rocket force is engaging the enemy near its refinery. Keep pressure on the refinery and enemy rocket soldiers while the second refinery completes; existing queues are already producing infantry, so save funds for tanks once income arrives.
- **3:04 GPT-6 Luna**: The nearby enemy infantry are a more immediate threat than the distant enemy base. Pull the critically wounded rocket soldier back and concentrate the healthier troops on the enemy group while the refinery finishes; queue a tank for sustained production.
- **3:12 GPT-5.6 Luna**: Continue the westward assault against the enemy War Factory while the second refinery completes. Keep rocket production running; once ore arrives, transition the War Factory to light tanks and expand pressure.
- **3:12 GPT-6 Luna**: Enemy infantry are close to both the forward rocket soldiers and the base. Pull the critically damaged soldier back, focus the forward group on the enemy rocket soldier, and use the home group against the enemy rifleman; keep the harvester mining and production queues running.
- **3:20 GPT-5.6 Luna**: The enemy War Factory is exposed near (14,13), and my rocket force is already pushing west. Keep pressure on it while the second refinery finishes; preserve the critically damaged rifle and rocket soldiers rather than committing them directly.
- **3:20 GPT-6 Luna**: Cash is exhausted, so let the refinery and queued units finish. Pull the nearly destroyed rocket soldier back and use the two healthier rocket soldiers to clear the nearby weakened enemy infantry.
- **3:28 GPT-5.6 Luna**: The second refinery is still building and cash is empty, so preserve damaged rockets while the economy comes online. Send the four healthier rockets to destroy the exposed enemy refinery and nearby forces; keep production queues active with rocket soldiers.
- **3:28 GPT-6 Luna**: Enemy infantry are pressuring the base; focus the healthy rocket soldier on the nearest threat and pull the badly damaged one back. Keep the existing refinery, tank, and infantry queues running while cash recovers.
- **3:36 GPT-5.6 Luna**: The healthy rocket group is positioned to strike the enemy base near (14,14); send them in attack-move while damaged rockets stay back. Keep the refinery construction moving and the ore truck harvesting so cash resumes for a second refinery or war factory.
- **3:36 GPT-6 Luna**: Cash is exhausted, so let the refinery finish and restore income before adding more production. Keep the damaged rocket soldier safe while the healthier one engages the nearby enemy infantry; send the harvester back to mining.
- **3:44 GPT-5.6 Luna**: The refinery is nearly complete and income is currently exhausted, so preserve the damaged rocket soldiers while the healthy group continues pressuring the enemy base. Keep the rocket production queue active and attack toward the previously identified enemy War Factory.
- **3:44 GPT-6 Luna**: Our two Rocket Soldiers are badly damaged and outnumbered by nearby enemy infantry, so avoid a direct fight and pull them back to the base while the queued reinforcements finish. Keep the harvester mining and let the refinery and tank production complete to restore our economy and fighting strength.
- **3:52 GPT-5.6 Luna**: The healthy rocket group should continue toward the suspected enemy base and prioritize the War Factory. Pull the two badly damaged rockets home; the refinery is nearly ready and should be placed as soon as it completes.
- **3:52 GPT-6 Luna**: The enemy infantry is close, and my only combat units are two rocket soldiers, one badly damaged. Pull them back toward the base while the refinery finishes; keep the harvester mining and let the existing tank and infantry queues continue.
- **4:00 GPT-5.6 Luna**: Ore Refinery is nearly ready; place it immediately to stabilize income. Send the healthy rocket group toward the suspected enemy base while withdrawing damaged soldiers, then keep the War Factory producing light tanks once funds arrive.
- **4:00 GPT-6 Luna**: The harvester is badly damaged and exposed near three enemy rocket soldiers, so pull it back toward the base. Keep our two rocket soldiers nearby on defense while the refinery and queued units finish.
- **4:08 GPT-5.6 Luna**: Enemy refinery is exposed and nearly destroyed. Finish it with the healthy rocket squad while damaged rockets retreat; keep tank and rocket production running and let the refinery complete.
- **4:08 GPT-6 Luna**: The base is under immediate pressure from three enemy rocket soldiers, and our army and harvester are both badly depleted. Keep the infantry near the base to defend while the refinery completes and income resumes; the queued production can continue when funded.
- **4:16 GPT-5.6 Luna**: The enemy refinery is nearly destroyed; finish it with the healthy rocket group while damaged rockets return home. Keep tank and rocket production running, place the nearly complete second refinery, and rally the War Factory toward the enemy.
- **4:16 GPT-6 Luna**: The damaged harvester needs to resume mining so the refinery can fund the already queued production. Our two rocket soldiers are outnumbered nearby, so keep them defending the base rather than chasing the enemy infantry.
- **4:24 GPT-5.6 Luna**: The enemy refinery at (15,16) is nearly destroyed. Send the healthy rocket force to finish it while damaged soldiers remain near base; the second refinery is still building and will be placed when ready.
- **4:24 GPT-6 Luna**: Cash is depleted and the harvester is badly damaged, so avoid a losing fight with the three nearby enemy rocket soldiers. Keep our rockets near the base, pull the harvester back to safety, and let queued production finish.
- **4:32 GPT-5.6 Luna**: The enemy refinery at (15,16) is nearly destroyed, so finish the attack with the forward rocket group. Place the completed second refinery to improve income, while pulling the two damaged rockets back toward the base; existing tank and rocket queues are already active.
- **4:32 GPT-6 Luna**: Cash is depleted, so prioritize getting the damaged harvester mining again and preserve the two rocket soldiers rather than engaging the larger enemy infantry group. Repair the damaged War Factory when funds permit; existing production queues can continue as income returns.
- **4:40 GPT-5.6 Luna**: The forward rocket group is probing the likely enemy base near (15,16), while two badly damaged rockets should retreat. Keep production queues running and wait for the second refinery to finish so it can be placed for stronger income.
- **4:40 GPT-6 Luna**: The enemy rocket soldiers are close to my base, so I’ll engage them with my own rockets and pull the damaged harvester back toward the base. Cash is empty; the refinery and existing production queues need to finish before I can add anything.
- **4:48 GPT-5.6 Luna**: The second refinery is nearly ready; place it immediately to restore income. Keep the forward rocket group pressuring the enemy Construction Yard while withdrawing the two badly damaged rockets, and continue tank/rocket production as funds return.
- **4:48 GPT-6 Luna**: The enemy has four rocket soldiers nearby, so avoid an even fight with our two, especially the badly damaged one. Keep the refinery building underway, pull the damaged rocket back, and send the healthier one to engage while the harvester returns to mining.
- **4:56 GPT-5.6 Luna**: The forward rocket group is pressuring the enemy Construction Yard, while two damaged rockets should remain back. Keep the harvester mining and prepare to place the nearly complete second refinery; continue tank and rocket production.
- **4:56 GPT-6 Luna**: We are badly outnumbered by enemy rocket infantry near our base, so pull our lone damaged rocket soldier back and avoid a direct fight. Keep the refinery construction progressing and get the damaged harvester back to mining as soon as possible.
- **5:04 GPT-5.6 Luna**: The forward rocket group is pressuring the exposed enemy Construction Yard while the refinery completes. Place the new refinery, then add power to support expansion; keep vehicle and rocket production running.
- **5:04 GPT-6 Luna**: The base is under immediate pressure, and our lone rocket soldier is nearly destroyed. Keep the refinery progressing, retreat the soldier, and send the harvester back to mining once it can safely move.
- **5:12 GPT-5.6 Luna**: The forward rocket force is pressuring the enemy Construction Yard, while two damaged rockets remain near home. Keep the assault focused on the enemy base, retreat the weakest unit, and place the ready refinery when possible.
- **5:12 GPT-6 Luna**: Our nearly destroyed rocket soldier is exposed to three enemy rocket soldiers, so pull it back immediately. Keep the harvester mining to fund the refinery already in progress; avoid committing more units into the nearby enemy group.
- **5:20 GPT-5.6 Luna**: The enemy Construction Yard is critically damaged; concentrate every rocket soldier on it for an immediate kill. Keep production queues running and rally the War Factory west toward the enemy base.
- **5:20 GPT-6 Luna**: The Construction Yard is critically damaged and enemy rocket soldiers are right beside the base. Pull the nearly destroyed rocket soldier back, keep the harvester working, and finish the refinery so the economy can recover.
- **5:28 GPT-5.6 Luna**: Enemy Construction Yard is nearly destroyed, so finish the western assault immediately. Power is low and cash is empty; the queued power plant and unit production should continue while harvesters replenish funds.
- **5:28 GPT-6 Luna**: The Construction Yard and refinery are gone, leaving no way to rebuild the economy; the base is in immediate danger. Send the harvester back to mining and have the critically wounded rocket soldier focus the nearby weakened enemy.
- **5:36 GPT-5.6 Luna**: Power Plant is nearly complete and will restore production. Group the surviving rocket soldiers to finish the exposed enemy power plant and continue sweeping the enemy base; keep vehicle queues active and harvesters mining.
- **5:36 GPT-6 Luna**: Your Construction Yard and refinery are gone, leaving no way to rebuild or earn income; the nearby enemy rockets also threaten your last buildings. Preserve the harvester and keep the existing rocket-soldier queue running in case it completes.
- **5:44 GPT-5.6 Luna**: Power is critically low, so let the power plant finish while existing tank and rocket queues continue. Regroup the scattered rocket force at the enemy base and destroy the exposed tent and damaged power plant; keep harvesters mining.
- **5:44 GPT-6 Luna**: The Construction Yard is gone, leaving no way to rebuild or restore power. The enemy rockets are next to the damaged harvester, so retreat it west and preserve it; the queued infantry may be the only remaining defense.

---
Source: https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g1.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms