---
title: "GPT-5.6 Luna vs Jev Router | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-jev-gpt56luna-g4.html
description: "Jev Router 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-jev-gpt56luna-g4

# GPT-5.6 Luna vs Jev Router

Jev Router destroyed the enemy base after 5.1 game-minutes · 7.9 min wall clock

Jetty run a5d0f3fc
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-jev-gpt56luna-g4.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-jev-gpt56luna-g4/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-jev-gpt56luna-g4/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-jev-gpt56luna-g4/validation_report.json)

LOSS england · west

GPT-5.6 Luna

openai/gpt-5.6-luna

Value destroyed$700Value lost$9,700
Units killed / lost5 / 13Buildings killed / lost0 / 5
Peak army$1,600Orders issued49
Decision turns (failed)39 (0)Mean latency3.4sModel cost$0.028

WIN england · east

Jev Router

typesafe/jev-router

Value destroyed$9,700Value lost$700
Units killed / lost13 / 5Buildings killed / lost5 / 0
Peak army$2,200Orders issued49
Decision turns (failed)39 (0)Mean latency4.8sModel cost$0.085

## 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 | jev won: base destroyed |
| pass | code\_check | decisions-logged | turns per slot: {'Multi0': 39, 'Multi1': 39} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/39', 'Multi1': '0/39'} |
| pass | code\_check | video-decodes | duration 53.2s |
| pass | code\_check | video-complete | video ends at tick 7677 of 7677 |
| pass | code\_check | limits-respected | ended after 7.9 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | Notes section cites both models final thoughts and explains Jev Router early-raid sweep vs Luna reactive power crisis |
| pass | checklist | players-match-request | result.json shows Multi0=gpt56luna (openai/gpt-5.6-luna) and Multi1=jev (typesafe/jev-router) matching requested players |
| pass | checklist | no-silent-outage | run.log shows continuous tick updates with no gaps; 0/39 LLM failures for both models |

## 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 power followed by an ore refinery. Explore toward the likely enemy start once a scout or army is available.
- **0:00 Jev Router**: Standard Allies opening: deploy the MCV immediately to get a Construction Yard, then start power plant -> refinery -> barracks and keep units coming. Enemy is likely at (95,11), far east, so I'll focus on economy first.
- **0:08 GPT-5.6 Luna**: Construction Yard is deployed and the Power Plant is being built. Place it now if ready, then begin the refinery and establish the opening economy.
- **0:08 Jev Router**: MCV has deployed into a Construction Yard. Starting production of the first Power Plant to kick off our base buildup.
- **0:16 GPT-5.6 Luna**: Construction Yard is deployed with no power or economy yet. Start the first Power Plant, then place it next turn before beginning the refinery.
- **0:16 Jev Router**: Power plant is ready to place. Placing it now and immediately starting construction of an Ore Refinery to get harvester income going.
- **0:24 GPT-5.6 Luna**: Deploy the MCV and place the ready power plant, then start the refinery immediately to establish income.
- **0:24 Jev Router**: Powr is placed, so the earlier proc build failed. Now I can queue the refinery. With 2 buildings (fact+powr) I should place order: proc next, then barracks. Only one building queue so just start proc.
- **0:32 GPT-5.6 Luna**: Deploy the MCV, then immediately start and place an Ore Refinery to establish income. Follow with a barracks and early scouting infantry toward the suspected western enemy base.
- **0:32 Jev Router**: Refinery is currently building at 23%. Waiting for completion to place it and unlock the Allied Barracks and War Factory.
- **0:40 GPT-5.6 Luna**: Deploy the MCV immediately to establish the Construction Yard; previous building orders could not start without it. Then begin the refinery and prepare to place it near the base, followed by barracks and westward scouting.
- **0:40 Jev Router**: Refinery is still ~46% complete, so the building queue is occupied and there's nothing to place yet. Just waiting for it to finish so I can place it and start the next structure.
- **0:48 GPT-5.6 Luna**: Construction Yard and power are ready. Start the refinery immediately, then place it near the base to begin income; follow with barracks and scouting.
- **0:48 Jev Router**: Opening is progressing: refinery at 70% in the build queue. Nothing else can be queued while it finishes, and we have no units yet. Just wait for the proc to complete, then place it.
- **0:56 GPT-5.6 Luna**: The first refinery is still under construction, so I will let it finish before placing it and starting infantry production. No units are available yet; the immediate plan remains refinery, barracks, then war factory, scouting west toward the likely enemy start.
- **0:56 Jev Router**: Proc is nearly done (94%). Nothing else to do until it finishes and I can place it. Cash is healthy at $3378.
- **1:04 GPT-5.6 Luna**: The refinery is still under construction, so I will wait for it to finish and place it near the base. Once operational, I will add a barracks and begin scouting infantry toward the likely enemy start.
- **1:04 Jev Router**: Opening: place the ready Ore Refinery to start income, then get a barracks up for infantry while saving for a war factory. No enemy visible yet.
- **1:12 GPT-5.6 Luna**: The refinery is still under construction at 70%, so no new production can begin yet. Wait for completion, then place it and immediately start a barracks; scouting west will follow.
- **1:12 Jev Router**: Tent is 64% complete and will finish shortly. Economy is healthy with $2978 and harvester active. Next turn I will place the tent and start the War Factory.
- **1:20 GPT-5.6 Luna**: The refinery is nearly complete; place it as soon as it becomes ready, then build a barracks and begin infantry scouting toward the enemy’s likely western position.
- **1:20 Jev Router**: Place the barracks, start a War Factory for tanks, and queue a couple infantry to scout toward the enemy. Keep power margin in mind for later.
- **1:28 GPT-5.6 Luna**: Place the ready refinery to begin harvesting, then build a barracks and start scouting infantry toward the likely enemy base. Power is currently sufficient, so prioritize economy and early map vision.
- **1:28 Jev Router**: weap is building (16%), so the Building queue is busy; tent is placed so infantry can now be trained. I need map info and a bit of defense, so queue a few riflemen and start scouting east toward the enemy start.
- **1:36 GPT-5.6 Luna**: Barracks is still under construction; power is ample and the refinery is active. Keep the harvester mining, then start a War Factory as soon as the barracks is placed and queue infantry for scouting and defense.
- **1:36 Jev Router**: War factory is at 32% and tent already queued 3 riflemen. Economy is fine for now. I'll push my riflemen east to scout toward the enemy start and keep the harvester mining. Save cash for the war factory to finish, then add a second refinery.
- **1:44 GPT-5.6 Luna**: Place the ready barracks, start a War Factory, and begin infantry scouting toward the likely enemy base. The refinery is active and power is ample, so prioritize army production.
- **1:44 Jev Router**: War Factory at 49% and cash healthy. Queue a couple of rocket soldiers for base defense while the factory finishes, then build a second refinery and start pumping tanks. Keep the rifle squad scouting east toward the enemy start.
- **1:52 GPT-5.6 Luna**: War Factory is under construction and the barracks is active. Queue infantry for scouting and defense, then queue a second refinery to accelerate income once the War Factory completes.
- **1:52 Jev Router**: War factory nearly done; power is fine. I'll keep the infantry queue ticking, send harvester back to mining, and push my 3 rifle scouts further east toward the suspected enemy base at (95,11). Holding cash so I can finish weap and start a second refinery next.
- **2:00 GPT-5.6 Luna**: War Factory is nearing completion and the second refinery is in production. Keep the barracks busy with a mixed infantry force, then scout west toward the likely enemy start while preserving the initial troops.
- **2:00 Jev Router**: War Factory nearly done; keep infantry flowing and push scouts east toward the probable enemy base at (95,11). Once weap completes, build a second refinery for economy, then power.
- **2:08 GPT-5.6 Luna**: The War Factory is nearly complete and the second refinery is queued, so the economy and tank production are coming online. Send the scouting rifles west toward the likely enemy start while keeping infantry production active and rallying them forward.
- **2:08 Jev Router**: No enemy visible yet and I'm behind on production. War factory is basically done so I'll place it and start my next building. Keep the barracks busy with anti-tank rockets, push my rifle scouts further east to locate the enemy base, and hold the rocket soldiers back near the base.
- **2:16 GPT-5.6 Luna**: War Factory is nearly complete and the second refinery is queued, so economy and vehicle production are coming online. Send the westward scouts toward the likely enemy start while continuing rocket production; preserve the lone harvester and keep infantry rallying forward.
- **2:16 Jev Router**: War factory is ready to place now (last turn's place failed since it wasn't ready). Place it, keep the proc building, and push scouts east toward the enemy start. Queue a service depot/tanks once weap is up.
- **2:24 GPT-5.6 Luna**: War Factory and second refinery are nearly queued, while the scout force is approaching the enemy’s likely western base. Keep rocket production active and push the current army west to eliminate the visible infantry and reveal the base.
- **2:24 Jev Router**: Economy is starved ($1) with only 1 harvester. Prioritize a second harvester and cheap infantry while the second refinery finishes, and keep the scout trio pushing east toward the enemy base at (95,11).
- **2:32 GPT-5.6 Luna**: The War Factory is nearly complete and the refinery is queued behind it. Push the dispersed force west to eliminate the visible infantry and scout toward the enemy start while continuing rocket production.
- **2:32 Jev Router**: Cash is $0 with only one harvester working, so economy is the bottleneck; keep proc building and queue a second harvester. Scout rifle is nearly dead and an enemy e1 is right next to it — finish that enemy with the healthy rifle and pull the wounded one home.
- **2:40 GPT-5.6 Luna**: Place the ready War Factory near the base and keep the rocket force advancing toward the likely enemy start. The Refinery is already in the building queue; continue rocket production while scouting west.
- **2:40 Jev Router**: Proc is under construction and will provide a free harvester, so cancelling the queued harvesters to avoid stalling economic expansion. Assembling infantry at the eastern choke point.
- **2:48 GPT-5.6 Luna**: The refinery is nearly complete and the forward rocket force is already moving toward the likely enemy start. Keep pressure west, continue rocket production, and place the new refinery as soon as it is ready; then add another harvester and transition toward tanks.
- **2:48 Jev Router**: Economy is very tight ($0, 1 harvester, 2nd proc queued at 28%). I need to spend nothing now and scout east with my whole small army to locate the enemy base (likely at 95,11). Keep production queues running as cash allows.
- **2:56 GPT-5.6 Luna**: Our rocket force is nearing the enemy and should eliminate the visible infantry before scouting farther west. The refinery is still under construction and cash is empty, so preserve the force while keeping the harvester mining; no new expensive production is affordable yet.
- **2:56 Jev Router**: Cash is $0 so nothing new can be produced; just keep the army pushing east toward the enemy start and let the harvester mine. Building queue already on proc 42%.
- **3:04 GPT-5.6 Luna**: The forward rocket group should eliminate the visible infantry and continue scouting toward the likely enemy base at the southwest. Cash is exhausted while Refinery #proc builds, so preserve the harvester and keep existing rocket production queued.
- **3:04 Jev Router**: Cash is $0 with only one harvester, so economy is the bottleneck; proc #2 is at 42% already. Army of 8 is already pushed east past (43,22) - keep pressing toward the enemy start while waiting for income.
- **3:12 GPT-5.6 Luna**: The second refinery is nearly complete, while the rocket soldiers continue scouting toward the likely enemy base. Keep the western advance moving and preserve the harvester; once the refinery is placed, income should support tanks and additional production.
- **3:12 Jev Router**: Cash is $0 and I only have one harvester, so economy is the priority while my army continues scouting east toward the enemy start. Power is fine and a refinery is nearly done. Send the harvester to mine and push the army toward (95,11).
- **3:20 GPT-5.6 Luna**: Cash is empty, but the refinery in the Building queue is progressing and the harvester should continue mining. Keep the rocket soldier scouting toward the likely enemy base while infantry production continues; place the refinery once ready next turn.
- **3:20 Jev Router**: Second refinery is at 58%, which will grant a free second harvester upon placement. Forward infantry group is advancing well across mid-map towards (75,20), queueing light tank production for reinforcement.
- **3:28 GPT-5.6 Luna**: The second refinery is progressing and the economy should improve soon. Keep rocket production continuous, send the lone scout west toward the suspected enemy base, and set the War Factory rally west so new vehicles join the advance.
- **3:28 Jev Router**: Economy is stalled at $0 with the 2nd refinery at 60%; income should resume once it's placed. My forward group is stalled at (70,24) with no enemy visible, so I'll push them deeper toward the likely enemy base at (95,11) while keeping production queues fed for when cash arrives.
- **3:36 GPT-5.6 Luna**: The refinery is nearly complete and cash is currently exhausted, so preserve the economy while production finishes. Keep the existing rocket and tank queues active, rally units west toward the likely enemy base, and send the harvester back to ore.
- **3:36 Jev Router**: Army group A is already east around (72-74,17) with no enemy contact yet — keep pushing them toward the enemy base at (95,11). Cash is $0 so nothing new can be queued; the building queue holds proc at 60% and I'll place it the moment it's ready for a second harvester. Rally new production to a forward staging point so reinforcements don't trickle in alone.
- **3:44 GPT-5.6 Luna**: The second refinery is still under construction and cash is empty, so maintain production and keep the lone harvester mining. The western enemy base remains unscouted; once units emerge, push them west toward (12,16).
- **3:44 Jev Router**: Harvester #132 is about to dump ore at the refinery, which will fund the remaining 28% of proc and start tank/infantry queues. Main attack force is closing in on (95, 11), advancing further.
- **3:52 GPT-5.6 Luna**: The base is under attack by enemy infantry, but I currently have no combat units available to respond. Keep the refinery and tank queues running, repair the damaged barracks, and rally newly produced forces toward the enemy’s likely western position.
- **3:52 Jev Router**: Strike force is at the enemy base. Focus fire on the Construction Yard (#126) to cripple them. Cash is $0 so no new production; get the harvester mining and let the proc finish for a second harvester.
- **4:00 GPT-5.6 Luna**: Enemy raiders are inside the base and our army is nearly gone. Use the surviving rocket soldier to focus the damaged enemy rocket infantry while the Light Tank and second Refinery finish; place the Refinery immediately when ready.
- **4:00 Jev Router**: Cash is 0 so no builds. Keep pressure on the enemy fact #126 (57% hp) with the strike force and bring the two idle units forward as reinforcements. Proc will finish soon and give a free harvester.
- **4:08 GPT-5.6 Luna**: Enemy raiders are inside the base and our Construction Yard is critically damaged or destroyed. Focus the surviving rocket soldier on the clustered attackers, then use the completing Light Tank to clear them; keep infantry production active if funds arrive.
- **4:08 Jev Router**: Strike force is deep in the enemy base; their Construction Yard is at 0% so finishing it plus the tent/power will cripple them. Economy is weak but the refinery completes next tick giving a free harvester. Press the attack with everything.
- **4:16 GPT-5.6 Luna**: Enemy raiders are beside the base and our two rocket soldiers are badly outnumbered, but they must engage to protect the refinery and power. Repair the critical power plant and continue the queued rocket production; do not expand until the raid is contained.
- **4:16 Jev Router**: Strike force is at the enemy base; powr #124 is nearly dead and tent #139 at 54%. Press the attack to finish both buildings, and keep the two reinforcements moving in. Cash is $0 so rely on queued production.
- **4:24 GPT-5.6 Luna**: The base is under immediate infantry pressure and power is critically low. Keep the damaged rocket near the base, repair the power plant, and finish the queued tank so it can clear the raiders.
- **4:24 Jev Router**: Main force is idle at the enemy base area with no visible targets - they probably cleared that spot. I'll push them toward the enemy start (95,11) to find and destroy remaining buildings. Economy is starved ($0), so just let queued production finish and place the refinery next turn.
- **4:32 GPT-5.6 Luna**: Our base is under infantry/rocket pressure and power is offline. Engage the exposed rocket soldiers with the light tank, return the harvester to mining, and start a power plant as soon as resources permit.
- **4:32 Jev Router**: Main force is already at the enemy base trading with their tank and buildings; push them to finish off the war factory, and bring the two trailing units up. Economy is drained ($0) so queues will just wait for the next harvest — the proc at 84% will finish and add a free harvester.
- **4:40 GPT-5.6 Luna**: Critical situation: the base has no power and no combat units, while enemy infantry are directly beside the refinery and war factory. Queue light tanks immediately and use them to clear the enemy cluster; keep repairing both surviving structures and preserve the harvester.
- **4:40 Jev Router**: Enemy weap at (95,8) is nearly down (54%) and my main force is on top of it. Cash is $0 so production is just trickling; finish the enemy base push while the proc completes for a second harvester.
- **4:48 GPT-5.6 Luna**: Power is critically low and the base is under infantry/rocket pressure. Keep the harvester returning ore, start a power plant immediately, continue light tank production, and repair both damaged structures; newly produced tanks should rally toward the enemy cluster.
- **4:48 Jev Router**: Enemy weap at (95,8) is nearly dead (30%) and proc at (98,11) exposed. My forward force should finish them off while pulling back the two badly damaged rocket soldiers. Cash is $0 so I must place the finishing proc and get harvesters working.
- **4:56 GPT-5.6 Luna**: Power and cash are critically low, while the enemy infantry/rocket group is adjacent to the base. Keep the harvester mining and let the queued light tanks complete; rally them toward the northwest enemy position for an immediate counterattack.
- **4:56 Jev Router**: Our forward squad destroyed 3 enemy buildings; now sweeping the rest of the enemy base at (96, 11). The second refinery is almost complete and will double our harvesting income soon.
- **5:04 GPT-5.6 Luna**: I have no combat units and the refinery is nearly destroyed under direct infantry pressure. Prioritize restoring power and completing the war factory, while pulling the harvester away from the enemy group to preserve income.
- **5:04 Jev Router**: Second refinery is ready to place, which will grant another harvester. Power will be slightly low once placed, so queueing a power plant next. Army will sweep the rest of the enemy base area.

---
Source: https://evaljetty.com/openra/runs/r2-rr-jev-gpt56luna-g4.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms