---
title: "GPT-6 Luna vs Claude Sonnet 5 | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g2.html
description: "Claude Sonnet 5 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-sonnet5-gpt6luna-g2

# GPT-6 Luna vs Claude Sonnet 5

Claude Sonnet 5 destroyed the enemy base after 6.3 game-minutes · 8.7 min wall clock

Jetty run a47917a7
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-sonnet5-gpt6luna-g2.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g2/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g2/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g2/validation_report.json)

LOSS france · west

GPT-6 Luna

openai/gpt-6-luna

Value destroyed$800Value lost$14,800
Units killed / lost2 / 18Buildings killed / lost2 / 8
Peak army$1,900Orders issued39
Decision turns (failed)48 (0)Mean latency3.0sModel cost$0.016

WIN ukraine · east

Claude Sonnet 5

anthropic/claude-sonnet-5

Value destroyed$14,800Value lost$800
Units killed / lost18 / 2Buildings killed / lost8 / 2
Peak army$5,400Orders issued111
Decision turns (failed)48 (0)Mean latency4.2sModel cost$0.306

## 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 | sonnet5 won: base destroyed |
| pass | code\_check | decisions-logged | turns per slot: {'Multi0': 48, 'Multi1': 48} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/48', 'Multi1': '0/48'} |
| pass | code\_check | video-decodes | duration 64.7s |
| pass | code\_check | video-complete | video ends at tick 9401 of 9401 |
| pass | code\_check | limits-respected | ended after 8.7 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 to establish a Construction Yard, then begin the standard power-first opening.
- **0:00 Claude Sonnet 5**: Deploy MCV to start base, then queue power plant and refinery.
- **0:08 GPT-6 Luna**: The Construction Yard is deployed and the Power Plant is underway. I’ll start the Ore Refinery as soon as the Building queue is free; there are no units or threats to manage yet.
- **0:08 Claude Sonnet 5**: MCV already deploying. Start power plant then refinery once available.
- **0:16 GPT-6 Luna**: Deploy the MCV immediately and start the opening Power Plant. Once it is placed, build an Ore Refinery to establish income.
- **0:16 Claude Sonnet 5**: Place the power plant, then queue proc and barracks to start economy.
- **0:24 GPT-6 Luna**: Deploy the MCV and place the ready Power Plant, then start the Ore Refinery as the next building. Once placed, the refinery will provide our first harvester and income.
- **0:24 Claude Sonnet 5**: Continue economy buildup: proc for income, then barracks for infantry.
- **0:32 GPT-6 Luna**: The power plant is placed, but the MCV is still undeployed, so I need to establish the Construction Yard before starting the refinery. I’ll deploy it now and continue the opening economy next turn.
- **0:32 Claude Sonnet 5**: Refinery is building. Once ready I'll place it and continue economy/army buildup. Keep queue going with power and barracks next.
- **0:40 GPT-6 Luna**: The Construction Yard is deployed and power is ample. Start an Ore Refinery now to establish income and gain a free harvester; follow with a Barracks once it is placed.
- **0:40 Claude Sonnet 5**: Proc building in progress, wait to place. Queue power and barracks next.
- **0:48 GPT-6 Luna**: The refinery is already in the Building queue and power is ample. I’ll let it finish, then place it and start a barracks so I can begin producing an army.
- **0:48 Claude Sonnet 5**: Continue economy build-up: proc and powr already queued. Once ready, place them and start barracks/war factory.
- **0:56 GPT-6 Luna**: The refinery is already 47% complete, and there are no units or other production buildings available yet. Let it finish; then place it and start a barracks so we can begin producing units.
- **0:56 Claude Sonnet 5**: Continue building economy; proc almost done, powr queued. Will place buildings once ready and build barracks next.
- **1:04 GPT-6 Luna**: The Ore Refinery is 70% complete and power is ample. I’ll place it as soon as it’s ready, then establish infantry production and expand the economy.
- **1:04 Claude Sonnet 5**: Place proc, continue building power, then barracks and war factory.
- **1:12 GPT-6 Luna**: The Ore Refinery is nearly ready; place it as soon as it completes, then establish infantry production. Power is ample, and there are no units to move yet.
- **1:12 Claude Sonnet 5**: Base is developing; barracks and power plant in progress. Need to keep queue busy and plan war factory next for tanks.
- **1:20 GPT-6 Luna**: Place the ready refinery to start income, then begin a barracks and train infantry once it is available. Power is ample, so prioritize expanding the economy and getting production online.
- **1:20 Claude Sonnet 5**: Place barracks, keep building economy and army production going. Queue power plant next since already building weap.
- **1:28 GPT-6 Luna**: The barracks is still building, so I can’t start another building or train units yet. Keep the harvester mining; once the barracks is ready, I’ll place it and begin vehicle production as cash allows.
- **1:28 Claude Sonnet 5**: Place ready power plant, keep production going: build second proc, train infantry, queue more army buildings.
- **1:36 GPT-6 Luna**: Place the ready barracks and start a War Factory so vehicle production can begin. Keep the barracks queue active with infantry while the War Factory is built; power is sufficient for now.
- **1:36 Claude Sonnet 5**: Continue economy buildup, queue more production, keep infantry training. Enemy far west, need scouting and army buildup before attacking.
- **1:44 GPT-6 Luna**: The War Factory is still under construction, and power is sufficient for now. Keep the Barracks producing a small scouting force, then send them toward the likely enemy start while the harvester continues mining.
- **1:44 Claude Sonnet 5**: Keep economy expanding and infantry training. Continue production while proc, weap, powr build. Need to place buildings when ready.
- **1:52 GPT-6 Luna**: War Factory construction is underway and power is sufficient. Queue another Refinery for income, send the available infantry east to scout, and keep the harvester mining; the existing infantry queue can continue meanwhile.
- **1:52 Claude Sonnet 5**: Continue economy buildup, queue power and war factory, keep training infantry.
- **2:00 GPT-6 Luna**: The War Factory and second Refinery are already in the Building queue; keep the infantry queue producing while the factory finishes. Scout east toward the likely enemy start, and send the rocket soldier with the rifleman for protection.
- **2:00 Claude Sonnet 5**: Continue economy buildup: proc almost done, weap in progress, need power too. Queue more units and get engineer/rocket soldiers ready for later push.
- **2:08 GPT-6 Luna**: The War Factory is nearly complete and the second Refinery is queued; power is sufficient, so preserve cash for expansion and vehicle production. Keep scouting toward the likely enemy start and bring the idle rocket soldier along.
- **2:08 Claude Sonnet 5**: Place proc, continue building economy and army. Keep producing infantry and buildings.
- **2:16 GPT-6 Luna**: The War Factory is nearly ready and a second Refinery is queued, so I’ll keep the economy and vehicle production moving. Send the scattered infantry east to scout toward the likely enemy start while they gather.
- **2:16 Claude Sonnet 5**: Economy is running, war factory and power plant building. Keep training e3 and add more infantry. Once weap is ready, start tanks.
- **2:24 GPT-6 Luna**: The War Factory is nearly ready, but cash is too low to start vehicle production. Place it as soon as it completes, keep the queued Refinery progressing, and send the scattered infantry east to scout toward the likely enemy start.
- **2:24 Claude Sonnet 5**: Continue building economy and army. Queue more infantry production and keep expanding.
- **2:32 GPT-6 Luna**: Place the ready War Factory and send the scattered combat force toward the likely enemy start. Keep the existing infantry queue running and let the harvester gather resources.
- **2:32 Claude Sonnet 5**: Economy solid, war factory and power building. Keep training infantry and queue more once done. Idle infantry can hold position for now.
- **2:40 GPT-6 Luna**: The refinery is still building and cash is depleted, so let it finish generating income. My advancing infantry and rocket soldiers are spread out; send them together toward the likely enemy start and set the War Factory rally point eastward.
- **2:40 Claude Sonnet 5**: Economy running, production queued. Continue building army while structures finish. Group idle infantry defensively for now.
- **2:48 GPT-6 Luna**: The second refinery is underway, but cash is exhausted, so keep the harvester mining and avoid starting unaffordable production. The infantry are scattered along the eastern approach; regroup them with an attack-move toward the likely enemy base.
- **2:48 Claude Sonnet 5**: Continue building economy and army. Keep training e3s, build power plant, war factory in progress. Group idle infantry for defense/future push.
- **2:56 GPT-6 Luna**: Cash and stored ore are depleted, so I can’t start production yet. Keep the combat force pressing toward the likely enemy start while the refinery completes and the harvester resumes income.
- **2:56 Claude Sonnet 5**: Continue building economy and army. Keep training e3s and building war factory/power. Once weap done, start tank production.
- **3:04 GPT-6 Luna**: The second refinery is still building, and cash is too low to start more production. Send the scattered infantry and rockets east together to scout and pressure the likely enemy start.
- **3:04 Claude Sonnet 5**: War factory almost done, keep training e3s and hold infantry defensively near base until we have tanks.
- **3:12 GPT-6 Luna**: The second refinery is nearly complete, but cash is depleted and the lone harvester is away from the base. Keep the advancing infantry pressing toward the likely enemy start and send the harvester back to mine.
- **3:12 Claude Sonnet 5**: Weapon factory near completion. Build fix depot next, then start tank production. Continue infantry queue and defend against scout.
- **3:20 GPT-6 Luna**: The second refinery is already in progress, but cash is empty, so keep the existing force advancing while the harvester restores income. Once the refinery is placed, prioritize more power and keep the War Factory producing tanks as funds allow.
- **3:20 Claude Sonnet 5**: War factory nearly done. Continue training e3s, queue fix depot once weap completes, and mass idle infantry defensively near base while waiting for a bigger army before pushing.
- **3:28 GPT-6 Luna**: The second refinery is nearly ready, but cash is depleted, so I’ll place it to improve income and keep the infantry pressure moving toward the suspected enemy base. Power has only 20 spare, so I’ll add capacity once funds allow.
- **3:28 Claude Sonnet 5**: Power is low, need more power plants. War factory almost done. Keep training e3, build fix depot after weap. Group idle infantry to defend/attack nearby enemy units.
- **3:36 GPT-6 Luna**: Our infantry are badly outnumbered by enemy riflemen and rocket soldiers near (88,12), so pull them back rather than feed them into the fight. Place the ready refinery to gain its free harvester and restart income.
- **3:36 Claude Sonnet 5**: Weap ready to place, power is critical (0 made/80 used). Place weap near base, keep powr queue going, attack the weak enemy infantry nearby with idle army.
- **3:44 GPT-6 Luna**: Cash is depleted and power is low, so prioritize getting both harvesters back to mining and retreat the exposed infantry. Once income resumes, the next priority is a power plant.
- **3:44 Claude Sonnet 5**: Power still low; keep building power plants. Big idle army should push toward enemy base at (12,16) via attack_move.
- **3:52 GPT-6 Luna**: Power is 10 below demand, slowing production, so prioritize a Power Plant. Keep the two infantry safe near home while the harvesters bring in ore; resume tank production once cash is available.
- **3:52 Claude Sonnet 5**: Power is low, need that powr to finish. Army group is near (79-81,13-15), continue attack move toward enemy base at (12,16). Keep training more e3 and queue a fix depot for tanks later.
- **4:00 GPT-6 Luna**: Power is low and the Power Plant is already building; cash is empty, so prioritize bringing the scattered infantry home and keeping both harvesters mining. Once the plant completes, resume tank production.
- **4:00 Claude Sonnet 5**: Place ready power plant to fix low power, continue troop production, push army toward enemy base.
- **4:08 GPT-6 Luna**: Power Plant is nearly complete, so let it finish to restore production. Spend the available funds on a tank and a rocket soldier while the harvesters keep working; hold the two riflemen together near home until the army is stronger.
- **4:08 Claude Sonnet 5**: Power plant building, army moving west toward enemy base. Keep producing e3 and queue fix depot for tank support later.
- **4:16 GPT-6 Luna**: Place the ready power plant to fix the low-power production slowdown, then queue another power plant if affordable. Keep the tank and rocket queues running and send the forward riflemen scouting toward the likely enemy base.
- **4:16 Claude Sonnet 5**: Army is advancing toward enemy base. Power is low so let power plant finish. Keep pushing army forward and continue production.
- **4:24 GPT-6 Luna**: Place the ready power plant and keep the tank production queue running. The forward rifleman is near an enemy infantry unit, so bring the rocket soldier forward and attack-move both toward the enemy contact.
- **4:24 Claude Sonnet 5**: Place ready power plant to fix low power. Continue army push toward enemy base with attack_move. Keep training going.
- **4:32 GPT-6 Luna**: Cash is depleted, so I can’t meaningfully expand production this turn. I’ll keep both harvesters mining and send the tank and rocket soldier together to scout toward the likely enemy base without splitting them.
- **4:32 Claude Sonnet 5**: Army is pushing toward enemy base. Continue attack move with main force, keep training rocket soldiers, wait for fix depot to finish for tanks. Economy stable, add harvester for growth.
- **4:40 GPT-6 Luna**: Power is healthy, but cash is depleted despite ore still being stored. Keep the existing harvesters mining, scout toward the likely enemy start with the small escort, and queue affordable tank production as funds arrive.
- **4:40 Claude Sonnet 5**: Army is grouped near (28-33,14-18), continue pushing toward enemy base at (12,16). Keep training e3 and building economy.
- **4:48 GPT-6 Luna**: The only combat unit is an almost-destroyed light tank, while a large enemy infantry and rocket-soldier group is threatening the refinery area. Pull the tank back, keep both harvesters mining, and let the queued tanks finish before engaging.
- **4:48 Claude Sonnet 5**: Army is near enemy base at (12,16), engaging weak tank. Push forward to destroy enemy structures.
- **4:56 GPT-6 Luna**: The enemy infantry and rocket soldiers are on top of the base, while I have no combat units currently fielded. Keep the nearly finished light tank in production, cancel the extra queued tanks to avoid draining scarce funds, and keep the safer harvester mining.
- **4:56 Claude Sonnet 5**: Army is at enemy base already with buildings visible. Push attack into their base to destroy remaining structures. Keep training reinforcements and building economy.
- **5:04 GPT-6 Luna**: The enemy force is already on top of my base, and I have no combat units left. Queue emergency tanks and rocket soldiers as funds arrive, and get the damaged full harvester mining if it can move.
- **5:04 Claude Sonnet 5**: My army is already at enemy base, deal massive damage. Push all idle units to attack enemy buildings directly to finish them off. Keep production going.
- **5:12 GPT-6 Luna**: The enemy infantry and rocket soldiers are already inside the base perimeter, so the lone rocket soldier needs to engage while staying near our production buildings. Keep the surviving harvester mining; existing tank and rocket queues should resume as ore arrives.
- **5:12 Claude Sonnet 5**: Enemy base buildings are critically low HP. Push all attackers to finish them off; continue training reinforcements.
- **5:20 GPT-6 Luna**: The enemy is inside the base and we have no combat units yet. Keep the existing tank and rocket-soldier queues running, get the harvester back to mining, and rally reinforcements toward the immediate threat.
- **5:20 Claude Sonnet 5**: Enemy base near destruction. Push remaining army into their base to finish off buildings.
- **5:28 GPT-6 Luna**: Enemy infantry and rocket soldiers are at the base, while I have no combat units in the field and no cash. Keep the harvester mining so income can resume; the queued tanks and rocket soldiers should rally to the base as they complete.
- **5:28 Claude Sonnet 5**: My army is right at the enemy base with weak buildings remaining. Push attack on all buildings to finish them off, place fix, keep training.
- **5:36 GPT-6 Luna**: Enemy infantry and rocket soldiers are inside the base while I have no combat units deployed yet and no cash to respond immediately. I’ll pull the harvester away from the fighting and rally any newly produced units to a safer point near the base.
- **5:36 Claude Sonnet 5**: Continue final push on enemy base - fact at 20% hp, keep attacking all remaining buildings with grouped units near enemy base.
- **5:44 GPT-6 Luna**: Enemy infantry and rocket soldiers are inside the base while I have no combat units available, so keep the harvester mining and repair the damaged production buildings. The queued rocket soldiers should rally near the base to defend as they emerge.
- **5:44 Claude Sonnet 5**: Enemy base near death; push idle e1/e3 group to finish off remaining buildings. Keep production going.
- **5:52 GPT-6 Luna**: The enemy infantry and rocket soldiers are inside the base, while I have no combat units and almost no cash. Keep the harvester mining and start rebuilding barracks as soon as funds permit; repair the damaged power plant to preserve the remaining base.
- **5:52 Claude Sonnet 5**: My army is near enemy base with two power plants remaining visible. Push attack to destroy them and finish off the base. Keep production going.
- **6:00 GPT-6 Luna**: The Construction Yard and all production buildings appear to be gone, leaving no way to rebuild or train defenders. Keep the harvester mining and repair the damaged refinery to preserve the remaining economy.
- **6:00 Claude Sonnet 5**: Push remaining army to finish off enemy base; keep training more units and harvester for economy.
- **6:08 GPT-6 Luna**: The Construction Yard and all combat production are gone, leaving the base exposed to a large enemy infantry force. Keep the refinery and power plant repairing while the harvester returns to mining; there are no combat units available to defend them.
- **6:08 Claude Sonnet 5**: Enemy base near (10,14) nearly destroyed, one power plant visible. Push remaining army to finish it off and keep production going.
- **6:16 GPT-6 Luna**: I have no buildings, units, or cash, so I cannot rebuild or defend. The enemy army is at my former base and its production remains intact; there are no useful orders available.
- **6:16 Claude Sonnet 5**: No visible enemy buildings/units remain near their base - likely destroyed. Push army to explore and mop up remaining structures, keep training reinforcements and harvesters for economy.

---
Source: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g2.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms