---
title: "GPT-5.6 Luna vs Claude Sonnet 5 | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g4.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-g4

# GPT-5.6 Luna vs Claude Sonnet 5

Claude Sonnet 5 destroyed the enemy base after 5.4 game-minutes · 6.7 min wall clock

Jetty run a816405d
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-sonnet5-gpt56luna-g4.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g4/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g4/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g4/validation_report.json)

LOSS france · west

GPT-5.6 Luna

openai/gpt-5.6-luna

Value destroyed$0Value lost$9,500
Units killed / lost0 / 15Buildings killed / lost0 / 5
Peak army$2,300Orders issued58
Decision turns (failed)41 (0)Mean latency3.0sModel cost$0.031

WIN russia · east

Claude Sonnet 5

anthropic/claude-sonnet-5

Value destroyed$9,600Value lost$100
Units killed / lost16 / 1Buildings killed / lost5 / 0
Peak army$5,100Orders issued111
Decision turns (failed)41 (1)Mean latency4.2sModel cost$0.265

## 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': 41, 'Multi1': 41} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/41', 'Multi1': '0/41'} |
| pass | code\_check | video-decodes | duration 55.8s |
| pass | code\_check | video-complete | video ends at tick 8062 of 8062 |
| pass | code\_check | limits-respected | ended after 6.7 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | Notes section explains infantry-rush win citing final thoughts from both gpt56luna and sonnet5 |
| pass | checklist | players-match-request | result.json shows gpt56luna (Multi0/west) and sonnet5 (Multi1/east) matching requested players |
| pass | checklist | no-silent-outage | run.log shows continuous turn-by-turn progress with 0 LLM failures on both sides across 41 turns each |

## 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 start the first power plant. I will establish the base and begin scouting toward the likely enemy start once production is available.
- **0:00 Claude Sonnet 5**: Deploy MCV to start base, then queue power plant.
- **0:08 GPT-5.6 Luna**: Place the ready Power Plant, then start and place an Ore Refinery to establish income. Continue the standard Allied opening with a Barracks and early War Factory while expanding scouting toward the enemy start.
- **0:08 Claude Sonnet 5**: Deploy already ordered; now start power plant while waiting for construction yard.
- **0:16 GPT-5.6 Luna**: Start the economy by constructing a Power Plant, then place it near the Construction Yard. Follow with an Ore Refinery and begin scouting toward the likely enemy position.
- **0:16 Claude Sonnet 5**: Place power plant, then start building refinery and barracks queue.
- **0:24 GPT-5.6 Luna**: Place the ready power plant, then start an ore refinery to establish income. Follow with a barracks and infantry scouting force while expanding economy.
- **0:24 Claude Sonnet 5**: Continue economy build-up: build ore refinery now that power plant is up, then barracks.
- **0:32 GPT-5.6 Luna**: Construction Yard and power are established. Start the refinery immediately, then place it next turn and follow with barracks and scouting infantry toward the suspected enemy base.
- **0:32 Claude Sonnet 5**: Proc is building. Queue barracks next once proc is placed, keep economy moving.
- **0:40 GPT-5.6 Luna**: The refinery is still under construction, with ample power and cash. I will wait for it to finish, then place it immediately and start a barracks.
- **0:40 Claude Sonnet 5**: Continue base setup: proc is being built, queue power and barracks next.
- **0:48 GPT-5.6 Luna**: The refinery is still under construction and should finish soon. Once ready, place it near the base, then build a barracks and begin scouting west toward the likely enemy start.
- **0:48 Claude Sonnet 5**: Continue building economy: proc almost done, powr in queue. Once ready, place them and continue with barracks.
- **0:56 GPT-5.6 Luna**: The refinery is nearly complete; wait for it to finish, then place it and immediately establish infantry and vehicle production. No army exists yet, so prioritize economy and scouting once units are available.
- **0:56 Claude Sonnet 5**: Continue base setup: proc almost done, powr queued. Once proc ready, place it, then build barracks and expand.
- **1:04 GPT-5.6 Luna**: The refinery is nearly complete; place it as soon as ready to start income, then queue a barracks. After the barracks, transition into a war factory and begin scouting toward the likely enemy start.
- **1:04 Claude Sonnet 5**: Place proc, continue power/barracks build order, start economy.
- **1:12 GPT-5.6 Luna**: Place the ready refinery to establish income. The barracks is already building; once placed, begin infantry scouting and then add a war factory, expanding power as needed.
- **1:12 Claude Sonnet 5**: Continue economy buildup: barracks and power finishing. Queue war factory next and start training infantry once barracks done.
- **1:20 GPT-5.6 Luna**: Place the completed second refinery to strengthen income. The barracks is nearly finished; queue a War Factory behind it, then begin infantry production and scout toward the likely enemy start.
- **1:20 Claude Sonnet 5**: Place barracks, continue building weap and powr. Start economy expansion.
- **1:28 GPT-5.6 Luna**: Place the ready barracks and begin infantry production while the War Factory completes. Then expand the economy with a second refinery and send the first combat group west toward the likely enemy start.
- **1:28 Claude Sonnet 5**: Continue economy buildup: queue power and war factory, train infantry from barracks.
- **1:36 GPT-5.6 Luna**: War Factory construction is underway and the base has adequate power. Queue a small infantry force from the barracks to scout west, then add a second refinery after the War Factory completes; send the force toward the likely enemy start.
- **1:36 Claude Sonnet 5**: Continue economy buildup: power, war factory, second refinery. Train more infantry for defense/early scouting.
- **1:44 GPT-5.6 Luna**: Place the completed second refinery, then finish and place the War Factory so tank production can begin. Send the rifle scout west toward the likely enemy start while infantry queues continue.
- **1:44 Claude Sonnet 5**: Building queue already has proc, powr, weap in progress. Keep training infantry and prep for expansion.
- **1:52 GPT-5.6 Luna**: War Factory is nearly complete, while the barracks is producing a rocket soldier. I’ll keep infantry production active, queue the second refinery, and push the scouts west toward the likely enemy base.
- **1:52 Claude Sonnet 5**: Economy building up well. Continue with power and war factory, keep training infantry, group idle infantry for defense.
- **2:00 GPT-5.6 Luna**: War Factory is nearly complete and the second refinery is queued, so economy and vehicle production should come online soon. Keep infantry production active, add rocket soldiers for anti-armor, and scout aggressively west toward the likely enemy base.
- **2:00 Claude Sonnet 5**: Place the ready refinery, keep building power/war factory, train more infantry, group idle army.
- **2:08 GPT-5.6 Luna**: War Factory is nearly ready and the second refinery is queued. Keep the infantry force advancing toward the likely enemy base while continuing rocket production; avoid diverting cash until the refinery and factory are placed.
- **2:08 Claude Sonnet 5**: Place the ready power plant, continue building weap/powr, and start training more infantry while waiting for war factory to build tanks.
- **2:16 GPT-5.6 Luna**: Place the completed War Factory, keep the advancing infantry scouting and press west toward the likely enemy base. Cash is low, so preserve the queued refinery and continue rocket production while the economy develops.
- **2:16 Claude Sonnet 5**: Building weap and powr continue. Keep training infantry, group idle e1s together for defense. Will build fix once weap done.
- **2:24 GPT-5.6 Luna**: Place the ready War Factory, keep the advancing infantry force scouting toward the likely enemy base, and add rocket soldiers while the economy recovers. The ore refinery and power plant queues should remain active.
- **2:24 Claude Sonnet 5**: Economy solid, buildings queued. Keep training infantry, prepare for war factory completion, then build fix and tanks. Group idle army for defense.
- **2:32 GPT-5.6 Luna**: The main force is advancing toward the likely enemy start, but no enemy has been spotted yet. Continue the westward attack sweep, bring the nearby rocket soldier along, and keep the harvester mining while the refinery finishes and income resumes.
- **2:32 Claude Sonnet 5**: Building weap and powr in progress. Have 18 infantry idle - group them for defense/future attack. Keep economy going, queue fix after weap, train more e3 for anti-tank.
- **2:40 GPT-5.6 Luna**: Cash is empty, so prioritize reaching the likely enemy base while existing production and refinery construction continue. Merge the scattered infantry and rockets into one attack group advancing toward the suspected base at (12,16); keep the harvester mining.
- **2:40 Claude Sonnet 5**: Weap and powr are building, e3 training continuing. Have 18 idle infantry - group them and set defend stance while waiting for tanks. Keep queue full.
- **2:48 GPT-5.6 Luna**: The army is already deep west and should continue toward the likely enemy start at (12,16), scouting and engaging anything found. Keep the refinery construction progressing and set production rallies; cash is currently exhausted, so avoid adding expensive orders until ore arrives.
- **2:48 Claude Sonnet 5**: Continue economy/production buildup, keep training infantry, war factory almost done. Group idle infantry for defense while waiting on tanks.
- **2:56 GPT-5.6 Luna**: The army is advancing toward the likely enemy base, but no enemy has been revealed yet. Keep the combat group moving west while the refinery completes; preserve cash for tanks and additional economy once ore arrives.
- **2:56 Claude Sonnet 5**: Weap almost done, powr building. Keep training infantry, mass idle army, prepare fix and tanks next. (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":)
- **3:04 GPT-5.6 Luna**: The army is closing on the enemy refinery and should destroy it while scouting the enemy base. Cash is empty, so keep the existing construction and infantry queues running; place the refinery when ready and transition to tanks once income arrives.
- **3:04 Claude Sonnet 5**: We have a huge infantry advantage (20 e1 + 2 e3) against a small enemy group of 6 units nearby. Attack now to wipe them out and gain map control while continuing production.
- **3:12 GPT-5.6 Luna**: Cash is empty, so preserve the economy while the refinery finishes. The scattered combat group will converge on the known enemy refinery and attack-move through the western base area.
- **3:12 Claude Sonnet 5**: Place war factory, keep building power/army, attack enemy scout, march big infantry group toward enemy base at (95,11).
- **3:20 GPT-5.6 Luna**: The base is rebuilding with a refinery nearly complete and only two rocket soldiers surviving. Send them toward the known enemy refinery while the economy recovers; keep the War Factory producing light tanks and the infantry queue producing rockets.
- **3:20 Claude Sonnet 5**: I have 24 idle infantry near base. Time to consolidate and push toward enemy base at (95,11) while continuing production. Build fix for tanks after power finishes.
- **3:28 GPT-5.6 Luna**: Economy is rebuilding with a refinery and power plant in the building queue while tanks and rockets are producing. Keep the surviving rocket advancing toward the known enemy refinery and maintain production; rally new tanks west for an eventual assault.
- **3:28 Claude Sonnet 5**: Place power plant, continue pushing army toward enemy base, keep training infantry and add more power/production.
- **3:36 GPT-5.6 Luna**: Economy is rebuilding with a second refinery and production already queued. Keep the lone rocket moving west to scout the known enemy refinery while existing tank and rocket queues continue.
- **3:36 Claude Sonnet 5**: Big infantry force is at (34-40,24), pushing east toward enemy base at (95,11). Keep them attack-moving there while continuing production of infantry and building fix/powr.
- **3:44 GPT-5.6 Luna**: Economy is recovering while the second refinery builds; keep the war factory and barracks queues active. Send the lone rocket soldier west to scout toward the last-known enemy refinery, then place completed refineries and add tanks as funds arrive.
- **3:44 Claude Sonnet 5**: Army is en route east toward enemy base. Keep producing infantry and start tank production once fix depot done. Send idle units to join main force.
- **3:52 GPT-5.6 Luna**: Cash is empty, so preserve the current production queues and let the refinery finish. Send the lone rocket soldier west to scout toward the last known enemy position while tanks and rockets assemble; set both production rallies forward.
- **3:52 Claude Sonnet 5**: Large infantry force is moving east; consolidate and push toward enemy base at (95,11). Keep training more units and building economy.
- **4:00 GPT-5.6 Luna**: The base is recovering economically, with a second refinery and power plant queued. Keep the existing tank/rocket production running, send the lone rocket west as a cautious scout, and keep the harvester mining.
- **4:00 Claude Sonnet 5**: Army is spread out near (60-68,20-28) advancing toward enemy at (95,11). Keep pushing attack_move, continue training infantry, and get tanks going once fix/weap ready.
- **4:08 GPT-5.6 Luna**: Cash is exhausted but the refinery is nearly complete and the second refinery/power queue should improve income. Keep all existing production queues active; once tanks and rockets emerge, gather them and push west toward the last enemy position.
- **4:08 Claude Sonnet 5**: Army is advancing toward enemy base at (95,11). Continue pushing with attack_move, keep training infantry and building infrastructure.
- **4:16 GPT-5.6 Luna**: Cash is empty, but the refinery and power plant are already queued and multiple light tanks/rocket soldiers are in production. Keep the harvester mining and preserve the queues; rally new forces west toward the enemy start once they emerge.
- **4:16 Claude Sonnet 5**: Army is spread near enemy base area. Push all forward units to attack_move toward enemy base, keep production going.
- **4:24 GPT-5.6 Luna**: Cash is empty but the refinery is nearly complete and production queues are already saturated. Keep the harvester mining, maintain tank/rocket production, and prepare the first westward attack once units emerge; repair the slightly damaged refinery.
- **4:24 Claude Sonnet 5**: Army is at enemy base already, engage all units to destroy remaining buildings. Keep production going.
- **4:32 GPT-5.6 Luna**: The base is under heavy infantry pressure, but production queues are already saturated and the refinery is being repaired. Keep the harvester mining and let the queued tanks/rockets assemble; rally them west toward the enemy base once they emerge.
- **4:32 Claude Sonnet 5**: Large infantry force is right at enemy base perimeter. Attack the buildings directly to finish them off. Place fix depot and keep production going.
- **4:40 GPT-5.6 Luna**: Enemy infantry is massed directly on the base, while our army has been wiped out and cash is empty. Keep the damaged Construction Yard and refinery repairing, maintain production, and send the harvester back to ore so the queued tanks can emerge and clear the rush.
- **4:40 Claude Sonnet 5**: Large infantry force is already near enemy base at (95,11). Push all remaining idle units into attack, focus fire on fact to finish it off. Keep economy running.
- **4:48 GPT-5.6 Luna**: Enemy infantry is overrunning the base, while the damaged refinery threatens our only income. Use the surviving light tank aggressively against the rocket soldiers and keep repairs and production active; queued rockets and tanks are our best chance to stabilize.
- **4:48 Claude Sonnet 5**: Big army near enemy base, keep attacking their remaining buildings to finish them off. Push idle units forward and train more.
- **4:56 GPT-5.6 Luna**: Enemy rush is inside the base, but production queues are already saturated and cash is empty. Use the damaged light tank to focus enemy rocket soldiers, keep the harvester mining, and repair the damaged barracks while reinforcements arrive.
- **4:56 Claude Sonnet 5**: My army is already near enemy base with idle units. Attack remaining enemy buildings directly to finish them off, and place ready power plant, keep econ going.
- **5:04 GPT-5.6 Luna**: The base is under heavy infantry pressure, with no combat units currently alive and power completely offline. Finish the war factory, restore power, and keep the harvester mining so tank production can resume; avoid exposing the harvester to the rush.
- **5:04 Claude Sonnet 5**: Large army already near enemy base at (95,8) weap. Push all idle units to finish it off, keep production going.
- **5:12 GPT-5.6 Luna**: The base is nearly overrun and the Construction Yard appears lost, so no power plant can be built. Keep the harvester mining and let the nearly completed War Factory finish; any available funds should go directly into light tanks for a counterattack.
- **5:12 Claude Sonnet 5**: Big army near enemy weap factory; finish it off and push further into base. Keep economy running with more harvesters and infantry production.
- **5:20 GPT-5.6 Luna**: We are in a critical recovery state with no Construction Yard or power, while the enemy infantry is overrunning the nearly destroyed War Factory. Keep the harvester mining and let the queued Light Tank finish if income arrives; there is currently no viable combat order for the lone harvester.
- **5:20 Claude Sonnet 5**: Army is already at enemy base with weap building at 5% hp. Push all units to attack it and finish the enemy. Keep production going.

---
Source: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g4.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms