---
title: "Claude Sonnet 5 vs GPT-5.6 Luna | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g3.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-gpt56luna-g3

# Claude Sonnet 5 vs GPT-5.6 Luna

Claude Sonnet 5 destroyed the enemy base after 7.2 game-minutes · 10.1 min wall clock

Jetty run 67220f81
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-sonnet5-gpt56luna-g3.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g3/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g3/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g3/validation_report.json)

WIN ukraine · west

Claude Sonnet 5

anthropic/claude-sonnet-5

Value destroyed$13,700Value lost$1,600
Units killed / lost19 / 16Buildings killed / lost7 / 0
Peak army$6,700Orders issued210
Decision turns (failed)55 (1)Mean latency4.5sModel cost$0.390

LOSS russia · east

GPT-5.6 Luna

openai/gpt-5.6-luna

Value destroyed$1,600Value lost$13,700
Units killed / lost16 / 19Buildings killed / lost0 / 7
Peak army$2,500Orders issued59
Decision turns (failed)55 (0)Mean latency3.6sModel cost$0.044

## 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 | sonnet5 won: base destroyed |
| pass | code\_check | decisions-logged | turns per slot: {'Multi0': 55, 'Multi1': 55} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/55', 'Multi1': '0/55'} |
| pass | code\_check | video-decodes | duration 74.4s |
| pass | code\_check | video-complete | video ends at tick 10860 of 10860 |
| pass | code\_check | limits-respected | ended after 10.1 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | Notes section explains Claude Sonnet 5 won by destroying base with superior army; cites both models final thoughts from decisions.jsonl |
| pass | checklist | players-match-request | result.json confirms Multi0=sonnet5 (anthropic/claude-sonnet-5) and Multi1=gpt56luna (openai/gpt-5.6-luna) matching the requested players |
| pass | checklist | no-silent-outage | all 55 decision ticks logged at regular 200-tick intervals with zero LLM failures for both players |

## 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 Claude Sonnet 5**: Deploy MCV to start base, then queue power plant.
- **0:00 GPT-5.6 Luna**: Deploy the MCV immediately, then establish power and begin the Soviet economy next turn.
- **0:08 Claude Sonnet 5**: MCV deploy already ordered. Start building power plant then refinery.
- **0:08 GPT-5.6 Luna**: The MCV has deployed into a Construction Yard. Start power immediately, then place it and begin the refinery to establish income.
- **0:16 Claude Sonnet 5**: Place power plant, queue ore refinery and start building barracks. Establish economy first.
- **0:16 GPT-5.6 Luna**: Construction Yard is deployed and the first power plant is ready. Place it, then start a refinery immediately to establish income; follow with another power plant and a war factory.
- **0:24 Claude Sonnet 5**: Already have power plant placed. Build proc next for economy, then barracks.
- **0:24 GPT-5.6 Luna**: Deploy the MCV now to unlock construction, then establish ore income. I will add a barracks and scout west toward the likely enemy start before investing in armor.
- **0:32 Claude Sonnet 5**: Continue economy build-up: proc is building, queue barracks next once proc done. Wait for proc to place.
- **0:32 GPT-5.6 Luna**: Deploy the MCV immediately, then start an Ore Refinery to establish income. Once placed, I will add infantry production and scout toward the likely enemy start.
- **0:40 Claude Sonnet 5**: Proc still building. Queue barracks next and power plant for support, keep economy growing.
- **0:40 GPT-5.6 Luna**: The first refinery is still building; power is sufficient and no army exists yet. I’ll place it as soon as ready, then immediately start barracks and scout west toward the likely enemy start.
- **0:48 Claude Sonnet 5**: Continue base building. Wait for proc and barr to finish, then queue power and war factory.
- **0:48 GPT-5.6 Luna**: Refinery is nearly complete, so I will wait for it to finish and then place it near the base. After that, establish infantry production and expand power while scouting toward the likely enemy start.
- **0:56 Claude Sonnet 5**: Continue building economy: proc almost done, barr queued. Add power plant and prep for weap factory next.
- **0:56 GPT-5.6 Luna**: The refinery is nearly complete and the barracks is queued behind it. Place the refinery as soon as ready, then establish infantry production and scout toward the likely enemy base at (12,16).
- **1:04 Claude Sonnet 5**: Place ready proc, keep production going with barr and more power.
- **1:04 GPT-5.6 Luna**: The refinery is nearly complete and should be placed immediately when ready; the barracks is queued behind it. I’ll place the refinery now if available and keep the building queue moving toward infantry production.
- **1:12 Claude Sonnet 5**: Place power plant, keep queue building barracks, then start war factory and second refinery.
- **1:12 GPT-5.6 Luna**: Place the ready refinery immediately, then keep the barracks queue moving and scout toward the likely enemy start with infantry. Economy is currently idle, so begin infantry production as soon as the barracks is placed.
- **1:20 Claude Sonnet 5**: Continue economy buildup while war factory and barracks finish. Add second refinery queue after barracks done.
- **1:20 GPT-5.6 Luna**: Place the ready second refinery to strengthen income. The barracks is nearly complete; once placed, begin continuous infantry and queue a war factory next, while scouting west toward the likely enemy base.
- **1:28 Claude Sonnet 5**: Continue building weap and barr, queue power and second proc for economy.
- **1:28 GPT-5.6 Luna**: Place the ready barracks, then build a War Factory and begin an infantry screen. I will send the first infantry west to scout and locate the enemy while the economy continues mining.
- **1:36 Claude Sonnet 5**: Continue building economy and army infrastructure. Keep queues busy.
- **1:36 GPT-5.6 Luna**: Place the ready barracks and begin infantry scouting while the War Factory completes. Send the first infantry west toward the likely enemy start; keep the harvester mining and prepare to produce tanks once the factory is placed.
- **1:44 Claude Sonnet 5**: Continue building economy and infrastructure, wait for weap/proc/powr to complete then place them.
- **1:44 GPT-5.6 Luna**: War Factory is nearly complete and infantry production is already queued. Start a second refinery for faster income, scout west toward the likely enemy base, and keep the existing infantry queue active.
- **1:52 Claude Sonnet 5**: Buildings still under construction, nothing to place yet. Wait for completion.
- **1:52 GPT-5.6 Luna**: War Factory is nearly complete and the second refinery is queued, so economy and vehicle production are coming online. Keep the barracks producing rocket soldiers, send the existing infantry west to scout toward the likely enemy base, and move the idle rocket soldier to support it.
- **2:00 Claude Sonnet 5**: Base is developing well. Weap almost done, need to place it and continue queueing buildings and army production.
- **2:00 GPT-5.6 Luna**: War Factory is nearly complete and refinery is queued next; power is sufficient. Continue rocket production, rally units west, and scout toward the likely enemy base at (12,16).
- **2:08 Claude Sonnet 5**: Place the ready war factory, keep building queue going. Economy stable, need more power and second refinery soon.
- **2:08 GPT-5.6 Luna**: The War Factory is nearly complete and the second refinery is queued, so the economy is developing well. Send the current rocket force west to scout and pressure the presumed enemy base while continuing infantry production.
- **2:16 Claude Sonnet 5**: Barracks nearly done, other buildings queued behind it. Economy needs a second harvester and eventually service depot for tanks. Keep production flowing.
- **2:16 GPT-5.6 Luna**: War Factory is nearly ready; place it and keep the rocket stream active. Move the scattered army west toward the presumed enemy start to scout and pressure while the second refinery completes.
- **2:24 Claude Sonnet 5**: Place ready barracks, keep economy building queue going, start training infantry for defense/early aggression.
- **2:24 GPT-5.6 Luna**: Place the ready War Factory, keep the barracks producing rockets, and push the existing army west toward the presumed enemy start to scout and threaten. The refinery is already queued next, so maintain economy while preparing tank production.
- **2:32 Claude Sonnet 5**: Base already has weap/barr built. Focus on training infantry and starting more economy/military production while first proc/powr/harv finish.
- **2:32 GPT-5.6 Luna**: The refinery is still under construction and the rocket queue is already substantial. Continue pushing the existing rocket force toward the presumed enemy base, while keeping the War Factory active with a cheap mobile flak unit and rallying it west.
- **2:40 Claude Sonnet 5**: Base is progressing; keep building economy and army. Queue more power and infantry while proc/fix finish. (error: {"error": {"message": "OpenRouter could not verify available credits for this request in time. Retry shortly.", "code": 429, "metadata": {"limit_source": "openrouter_admission_control", "remedy_hint":)
- **2:40 GPT-5.6 Luna**: The second refinery is still building, so cash is temporarily exhausted. Keep the barracks and War Factory producing while the rocket force advances west toward the presumed enemy base; regroup them through attack-move and keep the harvester mining.
- **2:48 Claude Sonnet 5**: Base is developing well. Continue building infrastructure and start producing tanks once fix completes. Keep training infantry and add another power/proc as needed.
- **2:48 GPT-5.6 Luna**: The rocket force is spread across the western approach but can continue regrouping while advancing toward the presumed enemy base. Cash is empty, so let the second refinery finish and keep existing vehicle and infantry queues active.
- **2:56 Claude Sonnet 5**: Continue building economy and army. Keep infantry training, add power, and prepare tank production once war factory finishes.
- **2:56 GPT-5.6 Luna**: The second refinery and flak truck are still in production, while the rocket force continues toward the presumed enemy base at (12,16). Keep the army advancing and maintain rocket production; place the refinery as soon as it completes next turn.
- **3:04 Claude Sonnet 5**: Enemy infantry spotted near my base at (19,14). Attack with my 5 e1s while continuing production. Keep training infantry and building economy.
- **3:04 GPT-5.6 Luna**: The rocket force is spread along the westward advance and the enemy harvester is exposed at (17,16). Focus all combat units on destroying it, then continue attack-moving toward the likely enemy base while production and the second refinery finish.
- **3:12 Claude Sonnet 5**: Base building progressing well. Keep training infantry and set idle ones to defend/hold near base while economy grows.
- **3:12 GPT-5.6 Luna**: The enemy harvester was likely destroyed, and my rocket troops are already spread along the route toward the suspected enemy base. Keep all combat units advancing to (12,16) while the refinery and existing queues finish; avoid starting another expensive project with no cash.
- **3:20 Claude Sonnet 5**: Place ready refinery, keep production going, group infantry for defense until army is bigger.
- **3:20 GPT-5.6 Luna**: The refinery is still building and cash is empty, so preserve the current production queues. Push all rocket soldiers west toward the suspected enemy start while continuing reconnaissance and avoid sending the harvester into danger.
- **3:28 Claude Sonnet 5**: Economy building up, infantry idle. Let's mass infantry near base and continue building production. Once weap/fix ready, start tank production.
- **3:28 GPT-5.6 Luna**: The second refinery is nearly complete, while the barracks is overqueued with rockets and the flak truck is about to finish. Push the scattered rocket force toward the suspected enemy base and set production rallies west.
- **3:36 Claude Sonnet 5**: Economy building up; keep training infantry and start vehicle production once war factory is ready. Group idle infantry for defense near base center.
- **3:36 GPT-5.6 Luna**: The refinery is nearly complete and the army is already probing west toward the suspected enemy base. Keep the two rocket soldiers and flak moving together, while existing production queues continue until cash improves.
- **3:44 Claude Sonnet 5**: Place ready power plant, keep production going, group idle infantry to deal with lone enemy rocket soldier nearby, continue building queue.
- **3:44 GPT-5.6 Luna**: The refinery is nearly complete and infantry production is already queued. Push the three combat units west toward the suspected enemy base while keeping the harvester mining.
- **3:52 Claude Sonnet 5**: Economy and production ongoing. Group idle infantry and hold position, keep training more infantry, wait for war factory to finish for tanks before pushing.
- **3:52 GPT-5.6 Luna**: The refinery is nearly complete, but cash is currently empty, so focus on advancing the surviving rocket/flak group toward the likely enemy base while production queues finish and income resumes.
- **4:00 Claude Sonnet 5**: Economy strong, buildings queued. I'll keep infantry production going and start massing idle infantry near front for eventual push, while waiting for weap/fix to finish for tanks.
- **4:00 GPT-5.6 Luna**: The second refinery is nearly complete; place it as soon as ready to improve income, then transition into tanks once funds allow. Continue scouting and pressure the likely enemy start with the forward rocket/flak group while the rear rocket joins.
- **4:08 Claude Sonnet 5**: Continue building infra, mass idle infantry to staging area, attack weakened flak truck with e1 group nearby.
- **4:08 GPT-5.6 Luna**: The refinery is nearly complete and cash is empty, so preserve the damaged flak while the forward rocket soldier engages the exposed enemy infantry. Reinforce the western group with the second rocket soldier and keep the harvester mining.
- **4:16 Claude Sonnet 5**: Continue economy buildup and mass infantry. Attack visible weak enemy units near our troops while waiting for war factory/tanks.
- **4:16 GPT-5.6 Luna**: The second refinery is nearly complete, but cash is currently empty. Keep the damaged flak alive by withdrawing it, while the forward rocket soldier engages the exposed enemy infantry and the other rocket scouts toward the enemy start.
- **4:24 Claude Sonnet 5**: Economy running fine, war factory almost ready. Consolidate idle infantry into attack group, continue training and building. Keep pushing east toward enemy scouting.
- **4:24 GPT-5.6 Luna**: The refinery is nearly complete, but cash is currently exhausted and the barracks has a long rocket queue stalled by income. Keep the harvester mining, place the new refinery as soon as it finishes, and send the surviving rocket soldier cautiously toward the known enemy approach.
- **4:32 Claude Sonnet 5**: Big infantry mass at (29,20) area. Weap/fix almost done for tanks. Regroup idle infantry and push toward enemy while keeping production going.
- **4:32 GPT-5.6 Luna**: Place the ready second refinery to improve income. Keep the rocket soldiers advancing toward the suspected enemy position while the barracks continues its queued rocket production; save for a war-factory unit when funds arrive.
- **4:40 Claude Sonnet 5**: Big infantry force gathered around (29-42,24-26). Time to push east toward enemy base while continuing production. Weap almost done, fix queued - will add tanks once ready.
- **4:40 GPT-5.6 Luna**: Power is low and the economy is recovering, so prioritize another power plant. The rocket scouts should continue probing toward the likely enemy base while the barracks queue remains active.
- **4:48 Claude Sonnet 5**: Weap factory ready to place; place it. Continue massing army and pushing east toward enemy base. Keep training more infantry and start tank production once weap placed.
- **4:48 GPT-5.6 Luna**: Power Plant construction is underway and the economy is cash-starved, so keep the existing rocket queue running. Send the two surviving rocket soldiers west to scout and pressure the likely enemy position near (29,18), while harvesters continue mining.
- **4:56 Claude Sonnet 5**: Army is scattered near (57-60,28), continue pushing toward enemy base at (95,11). Keep economy ticking with power/refinery/fix, and start producing e3 rocket soldiers and tanks once fix is ready.
- **4:56 GPT-5.6 Luna**: Power is critically low but the new plant is nearly complete. Keep the rocket production queue active and scout toward the likely enemy base; avoid committing the lone rocket into the visible rifleman without support.
- **5:04 Claude Sonnet 5**: Army advancing toward enemy at (95,11). Keep training infantry and building economy/defense. Send idle troops to join the main force.
- **5:04 GPT-5.6 Luna**: Power construction is nearly complete, while the economy is starved but both harvesters are operating. Keep rocket infantry production active, queue a replacement harvester and APC for continuous vehicle production, then add another power plant once the current one is placed.
- **5:12 Claude Sonnet 5**: Army advancing toward enemy base. Place ready power plant, keep production flowing, queue some tanks and rocket soldiers for better mix, continue attack move.
- **5:12 GPT-5.6 Luna**: Place the ready power plant immediately to restore power, then let the queued harvesters and rocket soldiers complete. Keep production active while rebuilding an army; the enemy remains unlocated near the western start.
- **5:20 Claude Sonnet 5**: Big infantry army pushing east toward enemy base at (95,11). Consolidate stragglers and push main force forward, keep production going and place new power plant.
- **5:20 GPT-5.6 Luna**: Cash is currently empty but ore income should resume shortly. Place the ready power plant, keep the queued rocket force moving west to scout, and start another refinery once funds are available.
- **5:28 Claude Sonnet 5**: Large army near enemy base at (95,11). Push attack on buildings directly to end game. Keep training e3 and building fix/powr.
- **5:28 GPT-5.6 Luna**: Enemy infantry are massed directly west of the base, while our economy is empty and the second refinery is still building. Use the lone rocket soldier to engage the exposed infantry, keep production running, and finish the refinery before expanding.
- **5:36 Claude Sonnet 5**: My army is already near the enemy base at (95,11). Push attack on remaining buildings and continue reinforcements toward the front.
- **5:36 GPT-5.6 Luna**: The enemy infantry rush is directly beside the base, while cash is empty and production is already committed. Keep the refinery and harvester queues running, pull the exposed harvester away from the infantry, and use the rocket soldier to focus weakened attackers.
- **5:44 Claude Sonnet 5**: Army is already at enemy base, fact is at 31% hp. Push the attack to finish it off, keep production going.
- **5:44 GPT-5.6 Luna**: Our base is under immediate infantry pressure, but we have no combat units and no cash while the refinery and harvester queues recover. Keep the refinery queue active, finish the extra harvester, and repair the critically damaged Construction Yard when funds arrive.
- **5:52 Claude Sonnet 5**: Large infantry force near enemy base at (90-95,9-13). Push idle units to attack remaining enemy buildings, keep production going.
- **5:52 GPT-5.6 Luna**: Cash is empty, so the immediate priority is keeping both harvesters mining while the queued APC and rocket soldiers complete. The enemy infantry is dangerously close to the eastern base; rally new troops toward that perimeter and repair the refinery and power infrastructure.
- **6:00 Claude Sonnet 5**: Large infantry group already near enemy base at (92-94,9-13). Push them to attack remaining enemy buildings, keep training reinforcements, place service depot.
- **6:00 GPT-5.6 Luna**: Enemy infantry is massing directly beside the base, while cash is empty and the APC/e3 queues are already active. Keep harvesters mining, use the rocket soldier to attack the exposed infantry cluster, and let the queued APC and rocket soldiers form the defense.
- **6:08 Claude Sonnet 5**: Big infantry force already at enemy base; push attack on remaining buildings (proc, weap, powr). Keep reinforcements moving up and continue training.
- **6:08 GPT-5.6 Luna**: Enemy infantry is pressing the base while our army is nearly gone and cash is empty. Keep the production queues running, pull harvesters away from the enemy cluster, and use the two rocket soldiers defensively against the closest infantry.
- **6:16 Claude Sonnet 5**: My army is near the enemy base with damaged buildings visible. Push attack onto remaining buildings, place ready power plant, keep training.
- **6:16 GPT-5.6 Luna**: Enemy infantry is overrunning the base while funds are empty. Keep the two rocket soldiers firing into the cluster, pull harvesters southeast, and repair the critically damaged refinery until the APC and rocket queues complete.
- **6:24 Claude Sonnet 5**: Large force near enemy base already; push attack onto remaining buildings weap#144 and powr#205 directly. Continue training reinforcements and keep economy running.
- **6:24 GPT-5.6 Luna**: The base is under immediate infantry pressure and power is low. Keep the harvesters mining, have the two rocket soldiers engage the enemy cluster from the base perimeter, and queue a power plant so the economy and production recover when ore arrives.
- **6:32 Claude Sonnet 5**: Big army already near enemy base; push attack on remaining buildings weap#144 and proc#187 to finish them off. Place ready barracks and keep training reinforcements.
- **6:32 GPT-5.6 Luna**: The enemy infantry is overrunning the base, while the missing Construction Yard leaves us unable to restore power or expand. Keep the APC and rocket production running, use the two rockets to hit the densest enemy group, and pull harvesters farther southeast to preserve income.
- **6:40 Claude Sonnet 5**: Big army already near enemy base, push to finish off weap and proc buildings. Keep training reinforcements and send idle units to the front.
- **6:40 GPT-5.6 Luna**: We have no power or Construction Yard, so rebuilding is impossible; the immediate priority is surviving with the existing refinery and letting the heavily queued rockets/APC finish. Harvesters are idle and exposed to the enemy near the base, so keep them mining while production rallies east for safety.
- **6:48 Claude Sonnet 5**: Enemy down to just weap and proc buildings. Push all forces at (92-98,8-15) to finish them off, keep training reinforcements.
- **6:48 GPT-5.6 Luna**: Enemy infantry is overrunning the base while power is offline and there are no combat units yet. Keep the existing rocket-soldier queue running, retreat the harvesters south to preserve income, and restore power as soon as funds arrive.
- **6:56 Claude Sonnet 5**: Army is clustered near enemy base; finish off proc#187 and mop up. Keep production going and send idle units to front.
- **6:56 GPT-5.6 Luna**: The base is under immediate pressure from a large enemy infantry mass, while low power is halting production. Start and place a power plant, keep the ore trucks away from the attackers, and let the queued rocket soldiers complete once power is restored.
- **7:04 Claude Sonnet 5**: Army is near enemy start but no visible targets right now; push forward to find and destroy remaining buildings. Keep training reinforcements.
- **7:04 GPT-5.6 Luna**: The base is effectively destroyed and power/construction capability is unavailable, so rebuilding cannot begin. I will use the three harvesters aggressively to crush or distract the infantry mass near the barracks while the existing infantry queue continues if funds become available.
- **7:12 Claude Sonnet 5**: Enemy base seems mostly destroyed, no visible enemy buildings left. Push remaining army further east/south to find and destroy any remaining structures, keep training more infantry.
- **7:12 GPT-5.6 Luna**: We have no economy or combat units, and the barracks is nearly destroyed while enemy infantry surrounds the base. Use all harvesters as an emergency assault against the weakest clustered infantry and keep the surviving barracks producing if income becomes available.

---
Source: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g3.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms