---
title: "GPT-6 Luna vs Claude Sonnet 5 | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g4.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-sonnet5-gpt6luna-g4

# GPT-6 Luna vs Claude Sonnet 5

GPT-6 Luna destroyed the enemy base after 4.6 game-minutes · 7.5 min wall clock

Jetty run 3960e956
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-sonnet5-gpt6luna-g4.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g4/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g4/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g4/validation_report.json)

WIN ukraine · west

GPT-6 Luna

openai/gpt-6-luna

Value destroyed$12,300Value lost$1,200
Units killed / lost4 / 6Buildings killed / lost10 / 0
Peak army$3,800Orders issued45
Decision turns (failed)35 (0)Mean latency3.1sModel cost$0.011

LOSS germany · east

Claude Sonnet 5

anthropic/claude-sonnet-5

Value destroyed$1,200Value lost$12,300
Units killed / lost6 / 4Buildings killed / lost0 / 10
Peak army$1,400Orders issued40
Decision turns (failed)35 (0)Mean latency4.6sModel cost$0.201

## 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': 35, 'Multi1': 35} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/35', 'Multi1': '0/35'} |
| pass | code\_check | video-decodes | duration 47.7s |
| pass | code\_check | video-complete | video ends at tick 6851 of 6851 |
| pass | code\_check | limits-respected | ended after 7.5 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | Notes section added to summary.md citing both models final thoughts on win/loss |
| pass | checklist | players-match-request | result.json confirms Multi0=gpt6luna (openai/gpt-6-luna) and Multi1=sonnet5 (anthropic/claude-sonnet-5) matching request |
| pass | checklist | no-silent-outage | 0 LLM failures across 35 turns each for both models, no gaps in run.log decision output |

## 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, then begin the standard Soviet power-and-refinery opening. The enemy is likely far east near (95,11), so prioritize establishing income before scouting or attacking.
- **0:00 Claude Sonnet 5**: Deploy MCV to start base construction.
- **0:08 GPT-6 Luna**: The Construction Yard is deployed and the opening Power Plant is underway. Place it, then start an Ore Refinery so I can establish income.
- **0:08 Claude Sonnet 5**: Construction Yard is placed. Now start building economy: power plant first, then refinery.
- **0:16 GPT-6 Luna**: Deploy the MCV immediately to establish the Construction Yard, then start the opening Power Plant. Once it is placed, build a Refinery to begin generating income.
- **0:16 Claude Sonnet 5**: Place power plant, start proc next, plan economy buildup.
- **0:24 GPT-6 Luna**: Place the ready power plant, then start a refinery so the free harvester can establish income. Keep the opening focused on economy before adding barracks and armor production.
- **0:24 Claude Sonnet 5**: Build economy first: refinery, barracks, more power as needed.
- **0:32 GPT-6 Luna**: The Construction Yard and first power plant are up, and power is plentiful. Start the refinery to gain income and a free harvester, then follow with a barracks before expanding vehicle production.
- **0:32 Claude Sonnet 5**: Continue economy buildup while proc finishes; queue barracks next.
- **0:40 GPT-6 Luna**: The first refinery is still building, so the earlier placement attempt was premature. I’ll place it as soon as it’s ready, then continue the barracks opening and get a harvester mining.
- **0:40 Claude Sonnet 5**: Continue economy buildup: proc and tent are queued. Add power plant to keep power sufficient once buildings placed.
- **0:48 GPT-6 Luna**: The refinery is nearly finished, and power is ample. Wait for it to become ready; place it next, then start a barracks and begin building an army.
- **0:48 Claude Sonnet 5**: Continue building economy: proc, powr, tent all queued already. Let production continue.
- **0:56 GPT-6 Luna**: The first refinery is already 70% complete, so let it finish and place it next turn. Power is ample; there are no units to command yet.
- **0:56 Claude Sonnet 5**: Continue economy buildup: proc almost done, powr and tent queued. Wait for placements.
- **1:04 GPT-6 Luna**: The first refinery is nearly ready and power is ample. Place it, start a barracks, then scout toward the likely enemy start while the refinery gets our economy going.
- **1:04 Claude Sonnet 5**: Place the ready proc refinery near base, continue building power and barracks.
- **1:12 GPT-6 Luna**: The refinery is ready to place; getting it down is the priority so its free harvester can start bringing in income. The barracks is already building, so I’ll let that finish before queuing infantry.
- **1:12 Claude Sonnet 5**: Place power plant, keep building barracks and economy expanding, then move to war factory for tanks.
- **1:20 GPT-6 Luna**: The barracks is already 64% complete, and power is ample. Keep the harvester working; once the barracks is ready, place it and prioritize a War Factory for tank production.
- **1:20 Claude Sonnet 5**: Economy building phase continues. Keep queuing production and prepare for expansion.
- **1:28 GPT-6 Luna**: Place the ready Barracks, then add a second Refinery to grow income before starting vehicle production. Queue a small infantry group to scout toward the likely enemy base at the northeast.
- **1:28 Claude Sonnet 5**: Economy building phase, proc and tent under construction. Queue more power and prepare for war factory once barracks done.
- **1:36 GPT-6 Luna**: The second refinery is already building, and power is ample. Queue a small rifle squad for scouting while the refinery completes; then prioritize a War Factory and tank production.
- **1:36 Claude Sonnet 5**: Continue economy buildup. Queue additional power and barracks, then war factory. Keep harvester mining.
- **1:44 GPT-6 Luna**: The second refinery is nearly finished, so place it and then start a War Factory for tank production. Send the infantry east to scout toward the likely enemy start while adding rocket soldiers to the barracks queue.
- **1:44 Claude Sonnet 5**: Economy building phase continues; queue already has proc, powr, tents in progress. Will keep adding production once current items finish.
- **1:52 GPT-6 Luna**: The second refinery is already 70% complete, so keep it progressing and prepare a War Factory next. Send the riflemen east to scout toward the likely enemy start while the queued rocket soldiers build up.
- **1:52 Claude Sonnet 5**: Place ready proc, continue building queue, keep economy growing.
- **2:00 GPT-6 Luna**: The second refinery is nearly ready, and the scouting infantry are already advancing east. Place the refinery, keep rocket production moving, and continue scouting toward the likely enemy base while income builds toward a War Factory.
- **2:00 Claude Sonnet 5**: Place ready power plant, queue war factory for tanks after barracks, keep econ growing.
- **2:08 GPT-6 Luna**: The second refinery is ready to place; placing it should strengthen income while the harvester keeps mining. Keep the scouting infantry moving toward the likely enemy start and save for a War Factory once funds allow.
- **2:08 Claude Sonnet 5**: Economy building phase continues; weap and tents in progress. Queue more power and start planning army once war factory finishes.
- **2:16 GPT-6 Luna**: Two refineries and two harvesters give us an economy to build on; power has only 20 spare, so add a plant before the War Factory. Send the eight infantry east together toward the likely enemy start while queuing rocket soldiers behind the current rifleman.
- **2:16 Claude Sonnet 5**: Economy building; continue queue. Wait for weap/powr/tent to finish before training units.
- **2:24 GPT-6 Luna**: Place the ready Power Plant to preserve a safe power margin. Keep the infantry advancing toward the likely enemy base; the current cash is too low to start a War Factory, and the Rocket Soldier queue is already active.
- **2:24 Claude Sonnet 5**: Production progressing well - weap, powr, tents queued. Wait for completion then start unit production.
- **2:32 GPT-6 Luna**: Power is healthy and both refineries are operating. Cash is not yet enough for a War Factory, so I’ll add a second barracks while the infantry scouts and advances toward the likely enemy start.
- **2:32 Claude Sonnet 5**: Economy strong, keep production going. Once war factory finishes, build tanks. Continue queuing barracks and power.
- **2:40 GPT-6 Luna**: The second barracks is still under construction, and cash is too low to start the War Factory. Keep the infantry push moving toward the likely enemy start and queue one rifleman with the funds available.
- **2:40 Claude Sonnet 5**: Continue building economy and army. Once war factory done, start tank production.
- **2:48 GPT-6 Luna**: Place the ready barracks, keep the infantry production queue active, and push the forward force toward the likely enemy start at (95,11). Cash is too low to start the War Factory yet; resume it when ore income arrives.
- **2:48 Claude Sonnet 5**: War factory almost done; keep production flowing. Queue tanks once ready and continue economy build.
- **2:56 GPT-6 Luna**: Power is healthy, but cash is low; keep both barracks producing inexpensive infantry while ore income rebuilds the bank. Start a War Factory as soon as funds allow and push the scattered forward force toward the likely enemy base.
- **2:56 Claude Sonnet 5**: Weap ready to place, enemy infantry sighted near base. Place war factory, keep building power/barracks, start training tanks once possible, queue fix depot.
- **3:04 GPT-6 Luna**: The War Factory is underway, but cash is low and the infantry queues are already backed up. Push the forward force toward the likely enemy base while the remaining home units catch up; start producing tanks once the factory is placed and funds allow.
- **3:04 Claude Sonnet 5**: Enemy infantry group near base (88-90,10-12) is a threat. Need to place power plant, get fix depot, and start tank production from weap. Barracks still building.
- **3:12 GPT-6 Luna**: The forward force is close to the enemy refinery, so press the attack and try to disrupt their economy. Cash is exhausted; the existing War Factory and infantry queues can continue as ore comes in.
- **3:12 Claude Sonnet 5**: Enemy infantry scouting close to base (89-90,10-12), potential rush. Keep production going, finish fix depot and barracks, queue more tanks for defense/counter.
- **3:20 GPT-6 Luna**: The War Factory is already under construction, and the infantry queue is progressing, but there is no cash to start anything else. Push the scattered army toward the enemy base and keep the harvesters mining so production can resume when ore comes in.
- **3:20 Claude Sonnet 5**: Enemy infantry scouting close to my base; finish tank production and build second power plant plus keep economy going. Hold defensive stance until tank force is bigger.
- **3:28 GPT-6 Luna**: The assault is already at the likely enemy base and has destroyed several buildings. Keep the whole army pushing through the base; the War Factory is still building, and there isn’t enough cash to start another production queue yet.
- **3:28 Claude Sonnet 5**: Enemy infantry cluster is close to our base (91,10) area, dangerous to our power plants. Keep tank defending, continue building economy and army.
- **3:36 GPT-6 Luna**: The assault is at the enemy base, with their harvester and a damaged light tank visible. Keep pressure on the Construction Yard while pulling the critically damaged rocket soldier out of danger; the War Factory is still under construction and cash is depleted.
- **3:36 Claude Sonnet 5**: Enemy infantry swarm is close to base; place fix depot, retreat damaged tank a bit, keep training tanks and defend.
- **3:44 GPT-6 Luna**: The assault is already at the enemy base, and their Construction Yard is exposed at 73% health. Focus the army on it to pursue an immediate win; keep both harvesters mining while the War Factory finishes.
- **3:44 Claude Sonnet 5**: Enemy infantry group is right on top of our base attacking buildings. Place power plant, keep producing tanks, defend with current tank, repair damaged structures.
- **3:52 GPT-6 Luna**: The enemy Construction Yard is down to 10%, so keep the assault concentrated to destroy it and end the game. Both harvesters should keep mining while the nearly finished War Factory waits for funds.
- **3:52 Claude Sonnet 5**: Enemy infantry is swarming right next to our construction yard (10% hp) - critical. Keep repairing, pull tank back to defend, keep training tanks fast.
- **4:00 GPT-6 Luna**: The army is already pressing the enemy base, with two tanks visible and a War Factory exposed. Place our ready War Factory, keep the assault moving through the likely Construction Yard location, and send both harvesters back to work.
- **4:00 Claude Sonnet 5**: Lost construction yard already; must defend remaining buildings with tanks and keep producing. Retreat damaged harvester, focus tank production and defend.
- **4:08 GPT-6 Luna**: The army is already pushing into the likely enemy base and has spotted a critically damaged light tank. Keep pressure moving through the enemy start while investing available resources in another War Factory for sustained vehicle production.
- **4:08 Claude Sonnet 5**: We lost our fact and are under heavy infantry attack near our base. Must defend proc/powr/weap with remaining tanks, keep pumping 1tnk from weap, and retreat the damaged harvester. No cash for luxuries yet - focus survival.
- **4:16 GPT-6 Luna**: The attack group is already pressuring the enemy base, with infantry and rockets close to its refinery and a light tank visible. Keep the assault moving, queue more anti-vehicle infantry, and use incoming ore to expand vehicle production once the War Factory finishes.
- **4:16 Claude Sonnet 5**: Enemy infantry swarm near our base threatens buildings. Low power stalls production. Focus tank defense on the weap/proc area, protect damaged harvester by pulling it back, and let power plant finish. Cancel excess queued tanks to save cash for repairs/units.
- **4:24 GPT-6 Luna**: Our infantry and rocket soldiers are already advancing near the enemy base; concentrate them on the visible refinery and continue the assault. Cash is exhausted, so let the harvesters replenish funds while the War Factory finishes.
- **4:24 Claude Sonnet 5**: Enemy infantry swarming near our base with no construction yard left. Need power urgently and to defend with tanks as they finish. Prioritize power plant and keep tank production going, pull harvester away from danger.
- **4:32 GPT-6 Luna**: The enemy refinery is nearly destroyed, and most of my infantry are already massed nearby. I’ll send the full army onto it while letting production and harvesting continue.
- **4:32 Claude Sonnet 5**: Base nearly destroyed, only proc left and enemy infantry swarm nearby. Try to salvage by building power and defending, move harvesters to safety.

---
Source: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt6luna-g4.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms