---
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-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-gpt56luna-g2

# GPT-5.6 Luna vs Claude Sonnet 5

Claude Sonnet 5 destroyed the enemy base after 5.9 game-minutes · 7.8 min wall clock

Jetty run a5fa0d15
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-sonnet5-gpt56luna-g2.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g2/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g2/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g2/validation_report.json)

LOSS ukraine · west

GPT-5.6 Luna

openai/gpt-5.6-luna

Value destroyed$0Value lost$8,900
Units killed / lost0 / 14Buildings killed / lost0 / 5
Peak army$2,200Orders issued92
Decision turns (failed)45 (0)Mean latency3.3sModel cost$0.036

WIN ukraine · east

Claude Sonnet 5

anthropic/claude-sonnet-5

Value destroyed$8,900Value lost$0
Units killed / lost14 / 0Buildings killed / lost5 / 0
Peak army$5,950Orders issued103
Decision turns (failed)45 (0)Mean latency3.9sModel cost$0.286

## 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': 45, 'Multi1': 45} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/45', 'Multi1': '0/45'} |
| pass | code\_check | video-decodes | duration 61.1s |
| pass | code\_check | video-complete | video ends at tick 8870 of 8870 |
| pass | code\_check | limits-respected | ended after 7.8 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | summary.md Notes section cites both models final thoughts and explains Sonnet 5 coordinated assault vs Luna base collapse |
| pass | checklist | players-match-request | result.json shows Multi0=gpt56luna and Multi1=sonnet5 as requested |
| pass | checklist | no-silent-outage | run.log shows continuous progress every 200 ticks with no gaps; both models had zero LLM failures across 45 calls 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 begin the standard Soviet economy with a power plant followed by an ore refinery. The enemy is likely far west, so scout and expand production after income starts.
- **0:00 Claude Sonnet 5**: Deploy MCV to start base, then queue power and refinery.
- **0:08 GPT-5.6 Luna**: The MCV is deployed and the first power plant is ready to place. I will place it, start the refinery, then establish infantry production and expand toward the likely enemy position.
- **0:08 Claude Sonnet 5**: Continue base setup, build power plant then proc and barracks.
- **0:16 GPT-5.6 Luna**: Deploy the MCV immediately, then begin the standard Soviet opening with a power plant followed by refinery and barracks.
- **0:16 Claude Sonnet 5**: Place power plant, start building proc next for economy.
- **0:24 GPT-5.6 Luna**: Deploy the MCV immediately, then begin the standard Soviet opening with power followed by an ore refinery. The enemy is likely far west, so prioritize economy before scouting.
- **0:24 Claude Sonnet 5**: Build proc now that it's available, then barracks and expand economy.
- **0:32 GPT-5.6 Luna**: The MCV is now deployed as a Construction Yard, so start the power plant immediately. Once power is online, build and place a refinery, then begin scouting west toward the likely enemy start.
- **0:32 Claude Sonnet 5**: Proc is building. Once ready, place it, then queue barracks and power. Keep economy building.
- **0:40 GPT-5.6 Luna**: Place the ready power plant, then start the refinery for income. Follow with barracks and a war factory while maintaining a strong Soviet production economy.
- **0:40 Claude Sonnet 5**: Continue economy build-up: proc is queued, then add power and barracks after placement.
- **0:48 GPT-5.6 Luna**: Construction Yard is deployed and power is sufficient; start the first refinery immediately, then establish infantry production and expand toward a war factory. No enemy has been spotted yet, so scouting will begin once units are available.
- **0:48 Claude Sonnet 5**: Continue base setup: proc is building, queue power plant and barracks next to keep economy and army going.
- **0:56 GPT-5.6 Luna**: The first refinery is still under construction, with ample cash and no army yet. Once it is ready, place it, then build a barracks and begin scouting toward the likely enemy start at (12,16).
- **0:56 Claude Sonnet 5**: Continue economy buildup: proc almost done, powr building too. Once ready, place them, then build barracks and war factory.
- **1:04 GPT-5.6 Luna**: Refinery construction is underway at 46%; let it finish before starting the barracks. Once placed, I will build barracks and scout toward the likely enemy start at (12,16).
- **1:04 Claude Sonnet 5**: Place proc, keep building power and barracks queue going.
- **1:12 GPT-5.6 Luna**: The refinery is nearly complete; place it as soon as ready, then build a barracks and scout toward the likely enemy start at (12,16). Keep the initial power surplus while establishing economy.
- **1:12 Claude Sonnet 5**: Base is developing, barracks and power queued. Continue economy: build second power plant and prep war factory next.
- **1:20 GPT-5.6 Luna**: The refinery is nearly complete; place it as soon as ready, then start a Soviet Barracks and produce a scouting infantry force. Explore west toward the likely enemy start while expanding the economy.
- **1:20 Claude Sonnet 5**: Place barracks, keep building power plants and continue expanding economy.
- **1:28 GPT-5.6 Luna**: Place the ready refinery immediately, then keep the barracks construction progressing. Once the barracks is placed, produce a large infantry scouting force and send it west toward the likely enemy start.
- **1:28 Claude Sonnet 5**: Base is running well; keep expanding economy and start producing infantry/army. Queue power plants and war factory.
- **1:36 GPT-5.6 Luna**: Place the completed second refinery to increase income. The barracks is nearly finished; once placed, begin infantry production and then add a War Factory, sending early scouts west toward the likely enemy base.
- **1:36 Claude Sonnet 5**: Continue economy buildup, keep infantry training, and queue more power/production.
- **1:44 GPT-5.6 Luna**: Place the ready barracks, start a War Factory, and queue infantry immediately for scouting and defense. After the factory is placed, switch to tank production and send the first infantry west toward the likely enemy start.
- **1:44 Claude Sonnet 5**: Base is building up well. Keep queueing production and start training some rocket soldiers for anti-tank defense. Idle infantry should hold position near base for now.
- **1:52 GPT-5.6 Luna**: War Factory construction is underway and the Barracks is now operational. Queue a scouting infantry force, then expand economy with a second refinery and power as production grows; send the first squad west toward the likely enemy start.
- **1:52 Claude Sonnet 5**: Economy building well, several buildings in queue. Keep training e3 and set units to defend while waiting for war factory.
- **2:00 GPT-5.6 Luna**: War Factory is still under construction and the second Refinery is queued behind it. Keep infantry production running, send the existing rifleman west to scout toward the likely enemy base, and prepare to place the War Factory when ready.
- **2:00 Claude Sonnet 5**: Place proc, keep building infrastructure. Set stance for infantry, wait for war factory to produce tanks. Queue more power and defenses.
- **2:08 GPT-5.6 Luna**: War Factory and second Refinery are in progress, with adequate power and infantry queued. Push the small scout group west toward the likely enemy start while continuing rocket production and setting a forward rally.
- **2:08 Claude Sonnet 5**: Place the ready power plant, keep economy and production going while war factory builds. Group idle infantry for defense.
- **2:16 GPT-5.6 Luna**: The War Factory and second Refinery are already queued, while rocket production is filling the barracks queue. Send the small scouting force west toward the likely enemy start and keep the economy/production running.
- **2:16 Claude Sonnet 5**: Continue economy buildup, keep queues busy, group idle infantry to defend base while waiting for tanks.
- **2:24 GPT-5.6 Luna**: The refinery and war factory are nearly queued, while the rocket force is scouting west toward the likely enemy base. Keep infantry production active and push the existing force toward (12,16); add a second barracks behind the current building queue.
- **2:24 Claude Sonnet 5**: Place barracks, keep economy growing; continue building war factory and power. Hold infantry near base defending, keep expanding.
- **2:32 GPT-5.6 Luna**: The War Factory is nearly ready; place it immediately and keep the rocket group advancing toward the likely enemy base. Economy is weak but stable, so finish the barracks queue and add refinery income before expanding production.
- **2:32 Claude Sonnet 5**: Continue economy buildup; queue more infantry while war factory finishes. Keep units defending near base.
- **2:40 GPT-5.6 Luna**: The War Factory is ready but was not placed at the previous coordinates, so place it automatically near the base. Keep the rocket force advancing west toward the likely enemy start while the refinery and infantry queues continue once ore arrives.
- **2:40 Claude Sonnet 5**: War factory and power plants still building. Keep training infantry and prepare tanks once war factory finishes. Group idle infantry defensively.
- **2:48 GPT-5.6 Luna**: The base is stable but cash-starved while the refinery and second barracks finish. Keep rocket production queued, send the scouting group toward the likely enemy start, and rally infantry west; add a harvester once funds arrive.
- **2:48 Claude Sonnet 5**: Economy solid, war factory finishing. Keep building power and training infantry. Group idle army together defensively for now.
- **2:56 GPT-5.6 Luna**: The economy is still starved, so keep the refinery and harvester pipeline active while the rocket force advances toward the likely enemy base. Queue more rocket soldiers and send all combat units west to scout and pressure.
- **2:56 Claude Sonnet 5**: War factory and power plants still building. Keep infantry producing and set stance to hold defend while base grows.
- **3:04 GPT-5.6 Luna**: The enemy refinery is exposed at (15,16); push the rocket screen onto it while the second barracks and refinery finish. Keep the harvester mining and set production rallies westward.
- **3:04 Claude Sonnet 5**: War factory almost done. Keep powr queued, then build fix for tanks. Group idle infantry to defend base, scout with rocket soldiers cautiously.
- **3:12 GPT-5.6 Luna**: Our rocket force is spread along the route but already near the enemy; converge on and destroy the exposed refinery, then continue west toward the likely base. Keep both barracks producing rockets and finish the queued refinery and harvester for economy.
- **3:12 Claude Sonnet 5**: Weap almost done; enemy infantry scouting near base at (19,16)/(20,14). Keep building fix next, queue tanks after. Send idle infantry to defend and clear scouts.
- **3:20 GPT-5.6 Luna**: The attack group is scattered but advancing toward the known enemy refinery at (15,16). Cash is empty, so prioritize harvesting and keep the existing rocket queues running while the refinery construction continues.
- **3:20 Claude Sonnet 5**: Place war factory, keep economy growing, train tanks once fix is built, keep army moving toward enemy.
- **3:28 GPT-5.6 Luna**: The enemy infantry is clustered near their refinery at (15,16), so the rocket group should converge and attack there despite one damaged soldier. Cash is empty, but queued rocket production and the second barracks should continue while the harvester brings in ore.
- **3:28 Claude Sonnet 5**: Place ready power plant, build service depot next, start tank production, continue pushing infantry east toward enemy scout.
- **3:36 GPT-5.6 Luna**: Place the ready second barracks to unblock construction, keep the lone rocket advancing toward the known enemy refinery, and let queued production and harvesting rebuild the army.
- **3:36 Claude Sonnet 5**: Consolidate scattered infantry group, keep pushing toward enemy base, continue building fix depot then start tank production, train more rocket soldiers for anti-tank support.
- **3:44 GPT-5.6 Luna**: The base is stable but cash-starved; the second refinery appears ready to place and should improve income. Keep infantry and harvester production active, and send the lone rocket west toward the suspected enemy refinery to scout and pressure.
- **3:44 Claude Sonnet 5**: Economy stable, army growing. Gather infantry scattered and push toward enemy base once fix depot done. Keep training rockets and start tank production queue.
- **3:52 GPT-5.6 Luna**: Cash is empty but the refinery and harvester production are progressing, while both barracks and the war factory have long queues. Continue scouting toward the likely enemy base and avoid adding more production until income stabilizes.
- **3:52 Claude Sonnet 5**: Army gathered near (44,24); push toward enemy base at (95,11) via mid-map. Keep producing tanks and infantry once fix depot done.
- **4:00 GPT-5.6 Luna**: The base is stable but cash-starved while the refinery and harvester continue ramping up. Keep the infantry queues active, push the rocket scout toward the likely enemy base, and add another refinery as soon as the current construction completes.
- **4:00 Claude Sonnet 5**: Army is spread near (44-55,24-28), push toward enemy base at (95,11). Keep training rocket soldiers and start building tanks once fix depot completes. Harvesters need to keep mining.
- **4:08 GPT-5.6 Luna**: The base is stable but cashless while the first additional refinery builds. Production queues are already saturated with rocket infantry and a harvester; keep the lone rocket scouting toward the likely enemy base and avoid starting more expensive construction until ore arrives.
- **4:08 Claude Sonnet 5**: Fix depot ready to place. Continue army push east toward enemy base at (95,11). Keep training e3 and start heavy tank production once fix depot placed.
- **4:16 GPT-5.6 Luna**: The base is operational but cash-starved, with a second refinery already queued and the harvester mining. Keep the rocket scouting west toward the suspected enemy start while production queues remain active; avoid adding expensive structures until income improves.
- **4:16 Claude Sonnet 5**: Army is spread out mid-map heading toward enemy at (95,11). Consolidate and push attack, keep training tanks and infantry while economy runs.
- **4:24 GPT-5.6 Luna**: The second refinery is nearly complete, but power will become tight once it is placed. Keep the vehicle and infantry production active, add a power plant to the building queue, and send any available army west toward the suspected enemy start.
- **4:24 Claude Sonnet 5**: Army is near enemy territory already; consolidate and push toward enemy base at (95,11). Keep production going.
- **4:32 GPT-5.6 Luna**: Enemy infantry is pressing the base, but no combat units are currently available; keep rocket production running to counter the mixed infantry and preserve funds for economy. Finish and place the refinery/power construction, then rally newly produced infantry toward the western enemy approach.
- **4:32 Claude Sonnet 5**: Push forces near enemy base to attack. Place ready power plant. Keep production going.
- **4:40 GPT-5.6 Luna**: Enemy infantry is pressing the base, but our queued rocket troops and riflemen should soon provide a defense. Keep both barracks producing, maintain the harvester, and avoid spending until the refinery completes and income returns.
- **4:40 Claude Sonnet 5**: Units are near enemy base, continue attack on their buildings directly. Keep production going.
- **4:48 GPT-5.6 Luna**: Power is critically low, but a Power Plant appears ready to place; placing it should restore production speed. The refinery is nearly complete, so keep the harvester mining and let the queued rocket/rifle infantry defend against the nearby western enemy mass.
- **4:48 Claude Sonnet 5**: Infantry group is near enemy base already, attack the construction yard and power plant. Keep production rolling.
- **4:56 GPT-5.6 Luna**: Power is critically low and the enemy infantry mass is already pressing the base. The Power Plant and refinery queues are underway; keep harvesting and let the existing barracks queues produce defenders while placing the power plant as soon as it becomes ready.
- **4:56 Claude Sonnet 5**: Troops near enemy base are idle, need to push attack on remaining buildings. Continue producing tanks/e3, place power plant once ready.
- **5:04 GPT-5.6 Luna**: Power Plant construction is underway but the base is critically low on power and exposed to a large enemy infantry force. Keep the harvester mining, preserve the refinery and Construction Yard, and let the queued infantry/harvesters continue until power is restored.
- **5:04 Claude Sonnet 5**: Infantry are already near enemy base; attack remaining buildings directly to finish them off. Keep production going and send reinforcements.
- **5:12 GPT-5.6 Luna**: Power Plant is still under construction, so production is slowed and the lone rifle must avoid the enemy mass. Keep harvesting and prepare the incoming infantry to defend the base; place the plant as soon as it finishes.
- **5:12 Claude Sonnet 5**: Enemy base weakened (fact 66%). Push all infantry near enemy to finish it off, place power plant, keep training reinforcements.
- **5:20 GPT-5.6 Luna**: The enemy infantry blob is pressing directly against the base while power is critically low and cash is exhausted. Keep the harvester mining, preserve the damaged Construction Yard and refinery, and let the nearly completed Power Plant finish so production can resume.
- **5:20 Claude Sonnet 5**: Enemy base is heavily damaged already. Push all forward units to finish off the remaining buildings while keeping production running at home.
- **5:28 GPT-5.6 Luna**: Our base is under immediate attack and we have no combat units available; the power plant is nearly ready and must be placed to restore production. Keep the harvester mining if possible, repair the Construction Yard and barracks, and continue the existing infantry/rocket queues.
- **5:28 Claude Sonnet 5**: Army near enemy base already, keep pushing attack on remaining buildings. Continue production.
- **5:36 GPT-5.6 Luna**: The base is nearly overrun and power is critically low, but the power plant is close to completion. Place it immediately and continue repairing the Construction Yard while production remains stalled; there is no cash for new units or defenses.
- **5:36 Claude Sonnet 5**: Enemy construction yard at 4% hp, push all units to finish destroying remaining buildings. Place power plant and keep production going.
- **5:44 GPT-5.6 Luna**: The base is critically damaged and has no functioning power or combat army; the harvester is nearly destroyed but may still be recoverable. Keep both production buildings repaired and attempt to return the harvester to ore while the existing infantry queues remain active.
- **5:44 Claude Sonnet 5**: Enemy base is nearly destroyed, push remaining army onto the war factory and barracks to finish them off. Keep production going.
- **5:52 GPT-5.6 Luna**: The base is effectively destroyed: no Construction Yard, no power, no income, and only a damaged War Factory remains while enemy infantry and rockets surround it. I will sell the War Factory to fund one mobile flak unit and attempt a last-ditch counterattack.
- **5:52 Claude Sonnet 5**: Army is near enemy base, finish off remaining weap building. Keep production rolling.

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Source: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g2.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms