---
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-g3.html
description: "GPT-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-g3

# GPT-5.6 Luna vs GPT-6 Luna

GPT-6 Luna destroyed the enemy base after 4.0 game-minutes · 5.0 min wall clock

Jetty run f1c0b4f0
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-gpt56luna-gpt6luna-g3.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g3/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g3/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g3/validation_report.json)

LOSS russia · west

GPT-5.6 Luna

openai/gpt-5.6-luna

Value destroyed$0Value lost$10,100
Units killed / lost0 / 10Buildings killed / lost0 / 6
Peak army$1,600Orders issued74
Decision turns (failed)30 (0)Mean latency3.4sModel cost$0.021

WIN germany · east

GPT-6 Luna

openai/gpt-6-luna

Value destroyed$10,100Value lost$0
Units killed / lost10 / 0Buildings killed / lost6 / 0
Peak army$3,800Orders issued28
Decision turns (failed)30 (0)Mean latency3.0sModel cost$0.009

## 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 | gpt6luna won: base destroyed |
| pass | code\_check | decisions-logged | turns per slot: {'Multi0': 30, 'Multi1': 30} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/30', 'Multi1': '0/30'} |
| pass | code\_check | video-decodes | duration 41.6s |
| pass | code\_check | video-complete | video ends at tick 5939 of 5939 |
| pass | code\_check | limits-respected | ended after 5.0 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | Notes section cites final thoughts from both models explaining GPT-6 Luna won by base destruction at tick 5940 |
| pass | checklist | players-match-request | result.json confirms Multi0=gpt56luna (openai/gpt-5.6-luna) and Multi1=gpt6luna (openai/gpt-6-luna) as requested |
| pass | checklist | no-silent-outage | run.log shows uninterrupted per-tick progress lines with no gaps or model failures across all 60 decision turns |

## 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 Soviet opening with power and refinery. I will establish the base and economy before scouting toward the enemy at the northeast.
- **0:00 GPT-6 Luna**: Deploy the MCV immediately to establish a Construction Yard; then start the power plant as soon as it is available.
- **0:08 GPT-5.6 Luna**: Construction Yard is deployed. Start the power plant, then place it as soon as ready and continue with refinery and production.
- **0:08 GPT-6 Luna**: The Construction Yard is deployed, but there is no power or income yet. Start a Power Plant, then place it when ready and follow with a Refinery.
- **0:16 GPT-5.6 Luna**: Place the ready power plant, then start an ore refinery immediately to establish income. With no army yet, prioritize economy and production infrastructure.
- **0:16 GPT-6 Luna**: Deploy the MCV and place the ready Power Plant, then start the first Refinery for income. Keep the opening economy moving toward a Barracks and armor production.
- **0:24 GPT-5.6 Luna**: Place the ready power plant, then start the refinery. After the refinery, establish infantry and vehicle production while scouting toward the likely enemy base.
- **0:24 GPT-6 Luna**: Deploy the MCV to establish the Construction Yard, then start the first Refinery as soon as it becomes available. With no harvester yet, prioritize getting the economy online before expanding toward the enemy.
- **0:32 GPT-5.6 Luna**: The Ore Refinery is currently under construction and power is sufficient. I will wait for it to finish, then place it and begin infantry production while preparing the next economic/vehicle tech step.
- **0:32 GPT-6 Luna**: The Construction Yard is deployed and power is ample. Start the first refinery, then establish infantry production and expand the economy while scouting toward the likely enemy start.
- **0:40 GPT-5.6 Luna**: The refinery is still under construction and the base has no units yet. Let it finish, then place it and immediately build a barracks for scouting and defense.
- **0:40 GPT-6 Luna**: The first refinery is already building, and power is ample. There are no units or other actionable orders yet; once the refinery is ready, I’ll place it and start a barracks.
- **0:48 GPT-5.6 Luna**: Place the completed refinery, then start a Soviet Barracks and train scouts/infantry. Once units exist, send them northeast toward the likely enemy start while continuing economy expansion.
- **0:48 GPT-6 Luna**: The Refinery is already in production and the base has ample power, so I’ll let it finish and place it next turn. There are no units available to scout or defend yet.
- **0:56 GPT-5.6 Luna**: The refinery is nearly ready; place it now, then maintain the barracks queue and begin scouting once infantry are available. Keep power and economy expanding before committing to an attack.
- **0:56 GPT-6 Luna**: The Refinery is already progressing in the Building queue, and power is sufficient. I’ll let it finish, then place it and start the Barracks.
- **1:04 GPT-5.6 Luna**: Place the ready refinery to start income and let the barracks finish. Then produce an infantry scouting force and follow with a war factory once the barracks is complete.
- **1:04 GPT-6 Luna**: The Refinery is nearly ready; placing it will provide the first harvester and start income. Then I’ll add a Barracks and begin building an army.
- **1:12 GPT-5.6 Luna**: Barracks is nearly complete; keep the economy running and immediately queue a War Factory once the barracks finishes. Then produce tanks and scout toward the likely enemy base northeast.
- **1:12 GPT-6 Luna**: Place the ready Refinery to establish income and gain a harvester. The Barracks is already building, so let it finish before starting vehicle production.
- **1:20 GPT-5.6 Luna**: Place the ready barracks, keep infantry production active, and use the first troops to scout and advance toward the likely enemy position. Preserve cash for the war factory and ensure the queued power plant is placed when ready.
- **1:20 GPT-6 Luna**: The Barracks is still under construction, so I’ll let it finish before starting the War Factory. The refinery is already placed; keep the harvester mining in the meantime.
- **1:28 GPT-5.6 Luna**: Place the ready power plant to maintain a safe power margin, then keep the barracks producing infantry while the War Factory completes. Once available, produce tanks and expand the economy with a second refinery.
- **1:28 GPT-6 Luna**: Place the ready barracks, then add a second refinery for income and its free harvester. Use the barracks to begin scouting toward the likely enemy start while saving for a War Factory.
- **1:36 GPT-5.6 Luna**: War Factory is under construction and power is sufficient. Keep infantry production running, send the existing rifleman east to scout toward the likely enemy base, and queue a second refinery as soon as the War Factory completes.
- **1:36 GPT-6 Luna**: The second refinery is already underway, and power is ample. Use the barracks to start a small westbound scouting force; start a War Factory once the refinery finishes so vehicle production can begin.
- **1:44 GPT-5.6 Luna**: War Factory is nearly complete and the barracks is filling the queue with anti-vehicle rockets. I will keep the scout moving east toward the likely enemy start, send the harvester back to ore, and queue an Ore Refinery after the War Factory finishes.
- **1:44 GPT-6 Luna**: The second refinery is nearly complete, and power is healthy. Keep infantry production moving while scouting toward the likely enemy start; follow the refinery with a War Factory for tank production.
- **1:52 GPT-5.6 Luna**: War Factory is nearly complete and the economy can support a second refinery soon. Keep rocket production running, push the scouting group east toward the likely enemy base, and use the new factory for tanks once placed.
- **1:52 GPT-6 Luna**: The second refinery is nearly ready and the War Factory is queued behind it; power is healthy for now. Keep the infantry scouting toward the likely enemy base while rocket soldiers continue training for the eventual attack force.
- **2:00 GPT-5.6 Luna**: War Factory is nearing completion and the infantry queue is already busy. Send the small scouting force east toward the suspected enemy start while the harvester continues mining; save cash for a second refinery or vehicle production.
- **2:00 GPT-6 Luna**: The second refinery is nearly ready and power is ample. Keep the infantry scout moving west toward the likely enemy start; once the War Factory is available, prioritize Medium Tanks and expand the attack force.
- **2:08 GPT-5.6 Luna**: The War Factory is nearly complete and the rocket scout is advancing toward the likely enemy base. Keep infantry production running, then place a second refinery as soon as the factory finishes to accelerate the economy.
- **2:08 GPT-6 Luna**: Place the ready refinery to add income while the War Factory finishes. Keep the infantry scouting west toward the likely enemy start; preserve the rocket soldiers for anti-armor support.
- **2:16 GPT-5.6 Luna**: War Factory is nearly complete, while the rocket scout group advances toward the likely enemy base. Keep the infantry queue producing rockets and send the group northeast to reveal and pressure the enemy.
- **2:16 GPT-6 Luna**: The War Factory is underway, but cash is too low to start another building or vehicle. Push the infantry west to scout toward the likely enemy start while the existing queues finish.
- **2:24 GPT-5.6 Luna**: Place the ready War Factory, then queue a second refinery to strengthen the economy. Keep the rocket force advancing east toward the likely enemy base while continuing rocket production.
- **2:24 GPT-6 Luna**: The western scout group has found an enemy rocket soldier; send the whole combat force west to engage and keep pressing toward the likely enemy base. The War Factory is already being built, so preserve that plan and start tank production once it is placed and funds allow.
- **2:32 GPT-5.6 Luna**: Place the completed second refinery to restore income, while the rocket soldiers engage the nearby enemy scout group. Keep infantry production active and push the surviving rockets east toward the likely enemy base.
- **2:32 GPT-6 Luna**: The War Factory and Rocket Soldier production are already underway, and power is sufficient. Keep the combat force pushing west toward the likely enemy start; the visible enemy Rocket Soldier is along the route.
- **2:40 GPT-5.6 Luna**: The second refinery is nearly complete, while the barracks has a long rocket queue. Cash is currently empty, so I will let the economy recover, keep the harvester mining, and prepare the new refinery placement; then switch the War Factory into tank production.
- **2:40 GPT-6 Luna**: The army is already probing west toward the likely enemy start, so keep it advancing together to reveal and pressure the base. Cash is exhausted; let the queued War Factory finish and the two harvesters bring in ore before adding production.
- **2:48 GPT-5.6 Luna**: The second refinery is nearly ready, while the single harvester is returning income. I’ll scout toward the likely enemy start with the rocket soldier and keep the existing production queues active; place the refinery as soon as it completes.
- **2:48 GPT-6 Luna**: The army is already scouting west toward the likely enemy start, but it is spread out. Cash is empty, so I’ll regroup the combat units into one attack-move toward the enemy position while the War Factory finishes.
- **2:56 GPT-5.6 Luna**: The second refinery is nearly complete, but cash is currently exhausted. Keep existing rocket infantry production running, return the harvester to ore, and prepare rallies so the expanding army can defend against the nearby enemy infantry and then scout east.
- **2:56 GPT-6 Luna**: The War Factory is still under construction, and there’s no cash available yet, so I’ll keep the advancing infantry focused on the likely enemy start while the harvesters gather income. Once the factory is ready, prioritize tanks and keep production running.
- **3:04 GPT-5.6 Luna**: The refinery is still under construction and cash is empty, so production cannot meaningfully expand yet. I will keep the harvester mining, avoid adding to the enormous infantry queue, and cancel one stalled rocket order to eventually clear the barracks queue.
- **3:04 GPT-6 Luna**: Our infantry are already advancing toward the likely enemy start near (12,16); keep them pressing west to scout and engage. The War Factory is nearly ready, but funds are currently unavailable, so I’ll leave production and construction queued while ore converts.
- **3:12 GPT-5.6 Luna**: The refinery is nearly finished, but cash is empty and the infantry queues are clogged with unaffordable orders. Cancel the queued infantry, keep the rocket soldier defending the base, and place the refinery as soon as it completes.
- **3:12 GPT-6 Luna**: Place the ready War Factory near home to add vehicle production capacity. Keep the infantry force advancing toward the enemy refinery and base; there’s no cash available to start more production yet.
- **3:20 GPT-5.6 Luna**: The enemy infantry group is pressuring the base while our only rocket soldier is badly damaged. Keep production queues active, pull the rocket back, and return the harvester to the refinery until the second refinery completes and tanks can be produced.
- **3:20 GPT-6 Luna**: Power is low, so prioritize another power plant while the harvesters bring in ore. The infantry force is already at the enemy base; keep it pressing into the visible War Factory and nearby defenses.
- **3:28 GPT-5.6 Luna**: The enemy infantry and rockets are pressing the base while cash is empty, so the refinery must finish and the ore truck must keep harvesting. Preserve the damaged war factory and continue filling infantry production queues until a defensive force forms.
- **3:28 GPT-6 Luna**: Power is low, but the Power Plant is already building; place it when it becomes ready. Keep the army pressing toward the known enemy base and send both harvesters back to mining.
- **3:36 GPT-5.6 Luna**: The enemy infantry mass is pressing directly east of the base, while the refinery is already under construction and the army is currently empty. Keep the refinery progressing, repair the damaged base structures, and keep the queued rocket/rifle production running; pull the exposed harvester back toward home if possible.
- **3:36 GPT-6 Luna**: The army is already pushing into the enemy base; keep it advancing to destroy the visible barracks and uncover the damaged enemy buildings. Power is low, so let the Power Plant finish before starting more construction or production.
- **3:44 GPT-5.6 Luna**: Our base and production infrastructure are gone, leaving only a damaged harvester and no income or army. Send the harvester against the nearby enemy infantry to delay them and attempt to preserve any remaining score.
- **3:44 GPT-6 Luna**: Place the ready power plant to end the low-power penalty, then push the infantry and rockets west to destroy the visible enemy plant and uncover the base. Cash is currently unavailable, so I’ll avoid queuing unaffordable production.
- **3:52 GPT-5.6 Luna**: I have no Construction Yard or production capability, so recovery is currently impossible. I will move the surviving harvester toward the likely enemy base to scout and preserve any chance of locating a surviving objective or enemy structure.
- **3:52 GPT-6 Luna**: Our army is already at the enemy perimeter, and the enemy harvester husk plus five buildings destroyed suggest the base may be nearly wiped out. Push west through the likely starting area to find and finish any remaining buildings; keep the War Factory producing tanks as ore income arrives.

---
Source: https://evaljetty.com/openra/runs/r2-rr-gpt56luna-gpt6luna-g3.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms