---
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-g1.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-g1

# Claude Sonnet 5 vs GPT-5.6 Luna

Claude Sonnet 5 destroyed the enemy base after 6.1 game-minutes · 8.6 min wall clock

Jetty run 7fa30839
[Replay (.orarep)](https://evaljetty.com/openra/media/r2-rr-sonnet5-gpt56luna-g1.orarep)
[Decision log](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g1/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g1/runtime_config.json)[Validation report](https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g1/validation_report.json)

WIN ukraine · west

Claude Sonnet 5

anthropic/claude-sonnet-5

Value destroyed$9,800Value lost$200
Units killed / lost15 / 2Buildings killed / lost4 / 0
Peak army$2,900Orders issued134
Decision turns (failed)46 (0)Mean latency4.3sModel cost$0.307

LOSS england · east

GPT-5.6 Luna

openai/gpt-5.6-luna

Value destroyed$200Value lost$9,800
Units killed / lost2 / 15Buildings killed / lost0 / 4
Peak army$2,400Orders issued67
Decision turns (failed)46 (0)Mean latency3.1sModel cost$0.035

## 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': 46, 'Multi1': 46} |
| pass | code\_check | llm-turns-valid | failed/total per slot: {'Multi0': '0/46', 'Multi1': '0/46'} |
| pass | code\_check | video-decodes | duration 63.2s |
| pass | code\_check | video-complete | video ends at tick 9175 of 9175 |
| pass | code\_check | limits-respected | ended after 8.6 wall-minutes (budget 30.0 min): base destroyed |
| pass | checklist | notes-explain-win | summary.md Notes section cites final thoughts from both models explaining Sonnet5 attack and Luna last-stand |
| pass | checklist | players-match-request | result.json players.Multi0=sonnet5 and players.Multi1=gpt56luna match the requested west and east slots |
| pass | checklist | no-silent-outage | run.log shows continuous turn logging through all 46 turns with 0 LLM failures for both models |

## 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 Allied economy. After the Construction Yard is active, start a power plant and follow with an ore refinery.
- **0:08 Claude Sonnet 5**: Continue economy build-up: power plant already queued, next build ore refinery once power ready.
- **0:08 GPT-5.6 Luna**: Deploy the initial power plant, then establish ore income and infantry production. I’ll place core buildings near the Construction Yard and begin scouting toward the likely enemy start.
- **0:16 Claude Sonnet 5**: Construction yard already placed. Start economy: power plant first, then refinery.
- **0:16 GPT-5.6 Luna**: Deploy the MCV immediately, then start the standard Allied opening with a power plant. Once placed, follow with a refinery and barracks while scouting west toward the likely enemy start.
- **0:24 Claude Sonnet 5**: Place power plant, start building proc next, expand economy.
- **0:24 GPT-5.6 Luna**: Deploy the MCV immediately and complete the opening power plant, then begin ore production. I’ll establish the base and start scouting west toward the likely enemy position once units are available.
- **0:32 Claude Sonnet 5**: Power plant already built, now start ore refinery for economy, then barracks.
- **0:32 GPT-5.6 Luna**: Construction Yard is deployed, but no power exists yet. Start the power plant immediately; place it next turn, then begin refinery production.
- **0:40 Claude Sonnet 5**: Proc is building; queue barracks next in building queue once proc done. For now just wait.
- **0:40 GPT-5.6 Luna**: Place the ready power plant, then start an ore refinery to establish income. Once the refinery is placed, build a barracks and begin scouting west toward the likely enemy base.
- **0:48 Claude Sonnet 5**: Ore refinery is building. Once done, queue barracks and power plant to keep economy growing.
- **0:48 GPT-5.6 Luna**: Place the ready power plant, then start the refinery to establish income. After that, build a barracks and begin scouting with infantry toward the likely enemy base.
- **0:56 Claude Sonnet 5**: Continue economy buildup while proc and powr finish. Queue barracks next.
- **0:56 GPT-5.6 Luna**: The refinery is still under construction and the barracks is queued behind it. No combat units exist yet, so continue the economic opening and place buildings as soon as they become ready.
- **1:04 Claude Sonnet 5**: Continue building economy: proc almost done, powr building. Queue barracks next for infantry production.
- **1:04 GPT-5.6 Luna**: The refinery is nearly complete and the barracks is queued next, so the opening economy is progressing correctly. No units are available yet; once the barracks is placed, begin infantry scouting west toward the likely enemy start.
- **1:12 Claude Sonnet 5**: Place proc near base, keep building barracks and power. Start economy rolling.
- **1:12 GPT-5.6 Luna**: The refinery is still under construction and the barracks is queued behind it, so I cannot produce units yet. Let construction finish, then place the refinery and barracks and begin westward scouting toward the likely enemy base.
- **1:20 Claude Sonnet 5**: Continue economy buildup: finish barracks, add power, then war factory for tanks. Enemy far east, need scouting later.
- **1:20 GPT-5.6 Luna**: Refinery is nearly complete and barracks is queued next. Once the refinery is ready, place it near the base, then establish infantry production and scout toward the likely enemy start.
- **1:28 Claude Sonnet 5**: Barracks ready to place. Continue building econ and army, place barr, keep producing.
- **1:28 GPT-5.6 Luna**: Place the ready refinery to start the economy, then place the queued barracks as soon as it completes. After that, produce infantry continuously while adding a second refinery or war factory once income permits.
- **1:36 Claude Sonnet 5**: Place ready power plant, keep building economy and army production going. Train some infantry while waiting for war factory.
- **1:36 GPT-5.6 Luna**: Refinery is established and the barracks is nearly complete. I will place the barracks, begin infantry production for scouting, and queue a War Factory as soon as the building queue permits.
- **1:44 Claude Sonnet 5**: Continue building economy, train more infantry while waiting for war factory. Keep expanding production.
- **1:44 GPT-5.6 Luna**: Place the completed barracks so infantry production can begin, then queue a scouting force. The War Factory is already queued; keep economy expanding with a second refinery after it completes.
- **1:52 Claude Sonnet 5**: Continue economic buildup while waiting for weap/proc/powr. Queue more infantry and keep expansion going.
- **1:52 GPT-5.6 Luna**: Place the ready barracks and begin infantry production while the War Factory completes. Send the first riflemen west to scout toward the likely enemy base, then expand economy with a second refinery.
- **2:00 Claude Sonnet 5**: Keep building econ. Train more rifle infantry while waiting for war factory. Group idle infantry for future defense/scouting.
- **2:00 GPT-5.6 Luna**: War Factory is under construction and a second refinery is queued. Send the current rifles west to scout toward the likely enemy base, while keeping infantry production active and adding rocket soldiers after the rifle queue.
- **2:08 Claude Sonnet 5**: Continue economy buildup; train more infantry while buildings complete. Keep queue full.
- **2:08 GPT-5.6 Luna**: The War Factory and second Refinery are progressing, while power is ample. Continue scouting aggressively toward the likely western enemy base and keep the barracks producing rocket soldiers for an eventual assault.
- **2:16 Claude Sonnet 5**: Weap/proc/powr building continue. Have 11 idle infantry, group them and hold near base while economy grows. Train e3 for anti-tank prep and queue fix after weap.
- **2:16 GPT-5.6 Luna**: The western scout group is advancing toward the presumed enemy start, while the War Factory and second refinery continue construction. Keep the rocket queue active and push the existing infantry west to reveal the enemy base; save cash for tanks once the factory is ready.
- **2:24 Claude Sonnet 5**: Weap almost done, proc and powr still building. Keep training e3 and prepare for tank production once weap and fix are ready. Set idle infantry to defend base.
- **2:24 GPT-5.6 Luna**: The War Factory is nearly complete and the refinery is queued, so the economy is transitioning well. Continue scouting aggressively toward the presumed enemy base while producing rocket infantry and setting the new factory to rally west.
- **2:32 Claude Sonnet 5**: Weap ready to place. Continue economic buildup and infantry production while proc/powr finish. Place weap near base.
- **2:32 GPT-5.6 Luna**: War Factory is nearly complete; place it immediately and keep the scouting force pushing toward the likely enemy base. Preserve cash for the queued second refinery while maintaining rocket infantry production.
- **2:40 Claude Sonnet 5**: Economy building continues; queue more power and fix. Keep training rocket soldiers and start massing infantry for defense while econ ramps.
- **2:40 GPT-5.6 Luna**: Cash is empty, so the refinery must fund the stalled queues. Place the ready War Factory and continue sweeping west toward the presumed enemy base; keep the scout force moving together.
- **2:48 Claude Sonnet 5**: Economy building up. Queue fix for tank repair, keep training e3 and start heavy tank production once possible. Group idle infantry as defense.
- **2:48 GPT-5.6 Luna**: The western scouting group is approaching the presumed enemy start but has found no units or buildings yet. Keep the infantry pressure moving west, queue Medium Tanks as funds arrive, and set the War Factory rally point toward the enemy.
- **2:56 Claude Sonnet 5**: Economy building continues; keep training rocket soldiers and queue a second harvester plus power. Once fix and weap ready, start tank production.
- **2:56 GPT-5.6 Luna**: The base is power-positive and production is fully active, but cash is temporarily depleted while the second refinery finishes. Continue scouting and pressure toward the presumed enemy start while queued tanks and rocket infantry assemble.
- **3:04 Claude Sonnet 5**: Economy building nicely. Keep training rocket soldiers and infantry, continue building infrastructure. Group idle infantry for defense near base while waiting for tanks.
- **3:04 GPT-5.6 Luna**: Continue the westward push toward the presumed enemy base while keeping all combat units together. Production queues are already full; let the refinery and tank/rocket queues generate cash and army.
- **3:12 Claude Sonnet 5**: Enemy jeep scouting near base; continue economy buildup and hold defensive stance. Queue more tanks once fix depot ready.
- **3:12 GPT-5.6 Luna**: The attacking force is spread along the western approach and the enemy base is now visible. Keep all combat units advancing on the enemy Construction Yard while existing tank and rocket queues continue; send the harvester back to ore.
- **3:20 Claude Sonnet 5**: Enemy infantry and jeep are near our base at (18-20,14-19). We have enough infantry to repel them. Group idle army and attack toward enemy cluster while continuing production.
- **3:20 GPT-5.6 Luna**: Enemy base is exposed and our army is already in position; focus fire on the Construction Yard for an immediate win, then clear remaining buildings. Keep production queues running and avoid risking the damaged rocket soldier unnecessarily.
- **3:28 Claude Sonnet 5**: Continue economy buildup and mass units; keep attacking nearby enemy infantry.
- **3:28 GPT-5.6 Luna**: The refinery is still under construction and cash is empty, so preserve the economy while the existing queues complete. Send the surviving rocket soldiers toward the known enemy Construction Yard and set production rallies west.
- **3:36 Claude Sonnet 5**: Economy and production ongoing. Consolidate idle infantry near base, keep building queue going, and continue training army. Will push toward enemy once army is larger.
- **3:36 GPT-5.6 Luna**: The refinery is nearly complete and multiple tank/rocket queues are already saturated, so the economy and production are progressing despite the empty bank. Send the surviving rocket soldier toward the known enemy base and keep the harvester mining.
- **3:44 Claude Sonnet 5**: I have a decent army sitting idle. Time to start moving them toward enemy base while continuing production. Keep building economy and more infantry/tanks.
- **3:44 GPT-5.6 Luna**: Cash is empty, but the refinery and packed tank/rocket queues should restore income and army strength. Send both rocket soldiers toward the known enemy base to scout and harass while production continues.
- **3:52 Claude Sonnet 5**: Army is grouped near (27-29,20-22), continue pushing toward enemy base at (95,11). Keep economy building and training more units.
- **3:52 GPT-5.6 Luna**: The refinery is still under construction and cash is empty, so preserve the lone rocket while production completes and the harvester returns ore. Keep the existing tank/rocket queues active and send the rocket cautiously toward the known enemy base for reconnaissance.
- **4:00 Claude Sonnet 5**: Continue economy buildup and push army toward enemy base at (95,11). Keep training units.
- **4:00 GPT-5.6 Luna**: Cash is empty, but the refinery and queued tank/rocket production are progressing. Keep production rallied west, send the surviving rocket forward as a cautious scout, and ensure the harvester remains mining.
- **4:08 Claude Sonnet 5**: Continue advancing army toward enemy base and keep economy/production running. Build more power and expand tech.
- **4:08 GPT-5.6 Luna**: Cash is empty but ore is accumulating; the refinery and existing queues should soon generate a tank-and-rocket force. Keep the lone rocket moving cautiously toward the confirmed enemy base while preserving it, and keep the harvester mining.
- **4:16 Claude Sonnet 5**: Army pushing east toward enemy at (95,11). Continue advancing group and keep economy/production going.
- **4:16 GPT-5.6 Luna**: Cash is exhausted, but the second refinery is halfway built and tank/rocket production is already queued. Send the surviving rocket west to scout toward the known enemy base while production and harvesting continue.
- **4:24 Claude Sonnet 5**: Army is en route to enemy base. Keep production going and continue advancing troops toward enemy start.
- **4:24 GPT-5.6 Luna**: Cash is empty, but the second refinery and multiple tank/rocket queues are already active and should convert incoming ore into a stronger economy and army. Send the lone rocket west to scout toward the suspected enemy base while keeping production rallies forward.
- **4:32 Claude Sonnet 5**: Army is grouped near (72,17), pushing toward enemy base at (95,11). Continue advancing and keep production running.
- **4:32 GPT-5.6 Luna**: The second refinery is nearly complete, while the economy is temporarily cash-starved. Keep the existing tank and rocket queues active, then place the refinery as soon as it is ready; use the first combat group to scout toward the likely enemy base at (12,16).
- **4:40 Claude Sonnet 5**: Army is near enemy base at (95,11), engage the visible tank and push forward. Keep production queues going, cancel some duplicate low-priority builds and focus economy/army.
- **4:40 GPT-5.6 Luna**: The base is economically strained but production is underway. Use the existing Light Tank to clear the enemy infantry nearby, while queued tanks and rocket soldiers build; continue scouting west toward the known enemy base.
- **4:48 Claude Sonnet 5**: Army is near enemy base at (90,14), enemy refinery visible. Push attack toward it with all army, keep training reinforcements, and continue economy buildup.
- **4:48 GPT-5.6 Luna**: The base is under infantry pressure, but all combat units have been lost and cash is nearly empty. Let the refinery finish to restore income, keep the harvester mining, and direct the existing production toward the western enemy base.
- **4:56 Claude Sonnet 5**: My army is near enemy base with visible buildings. Focus fire on fact/proc to break their economy and win. Keep production running at home.
- **4:56 GPT-5.6 Luna**: Our base is under heavy infantry and rocket pressure, but all available funds are committed and production queues are already saturated. Keep the damaged harvester mining and let the queued tanks/rockets emerge; regroup them west to clear the attackers before advancing toward the enemy start.
- **5:04 Claude Sonnet 5**: My assault group is near enemy base at (90-95,11-14). Push attack on fact#125 and powr#126 with all nearby units. Keep economy building progressing; too many queued infantry, but let them continue slowly. Focus attack.
- **5:04 GPT-5.6 Luna**: The base is under immediate infantry and rocket attack, while the harvester is critically damaged. Use the lone rocket soldier to focus the nearest enemy rocket unit and retreat the harvester toward the Construction Yard; preserve the queued tank and rocket production.
- **5:12 Claude Sonnet 5**: Enemy construction yard at 49% hp - keep attacking to finish it off. Push all forces toward enemy base and continue building economy/army.
- **5:12 GPT-5.6 Luna**: Enemy infantry and rocket soldiers are threatening the damaged Construction Yard, while cash is empty and production queues are already saturated. Pull the nearly destroyed harvester back and use the available rocket soldier to target the closest enemy rocket unit until tanks arrive.
- **5:20 Claude Sonnet 5**: Enemy base weakened, only powr and tent visible now. Push all units in to finish them off, keep reinforcements moving up, keep training more troops.
- **5:20 GPT-5.6 Luna**: Enemy infantry is overrunning the base while the economy is nearly dead and the harvester is critically damaged. Keep queued tanks and rockets producing, repair the Construction Yard and production buildings, and send the harvester back to the refinery if it survives.
- **5:28 Claude Sonnet 5**: My army is near enemy base with idle units. Attack remaining enemy buildings to finish them off.
- **5:28 GPT-5.6 Luna**: Enemy infantry is overrunning the base while all combat units are gone and the harvester is critically damaged. Cancel the long vehicle/rocket queues to recover funds, then prioritize cheap rifle infantry and keep buildings repaired.
- **5:36 Claude Sonnet 5**: Push the assault group into remaining enemy buildings while keeping stragglers moving up and production running.
- **5:36 GPT-5.6 Luna**: The base is being overrun and power is completely offline. Cancel the expensive stalled queues, sell the nearly destroyed barracks for emergency funds, then restore power and keep the War Factory alive; the harvester should retreat from danger.
- **5:44 Claude Sonnet 5**: Main force near enemy base with only weap#160 visible. Push attack, bring stragglers to join, keep production flowing.
- **5:44 GPT-5.6 Luna**: Power cannot be restored because the Construction Yard and Tent are gone. The War Factory has a long Light Tank queue, so preserve it and keep the damaged harvester mining while waiting for the first tank.
- **5:52 Claude Sonnet 5**: Army near enemy base with weap visible. Push attack on weap#160, bring stragglers to join, keep economy growing.
- **5:52 GPT-5.6 Luna**: The War Factory is under immediate infantry/rocket attack and is our only remaining building. Keep the Light Tank queue active, rally completed tanks away from the enemy, and preserve the badly damaged harvester so income can resume.
- **6:00 Claude Sonnet 5**: Attack force is at enemy base pressing weap#160. Place ready proc, keep economy building, bring stragglers up, continue infantry production.
- **6:00 GPT-5.6 Luna**: The base is under immediate infantry/rocket attack and the War Factory is critically damaged. Keep the harvester mining, repair the factory, and preserve the queued tank production so the first Light Tank can break the siege; power must be restored as soon as funds arrive.

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Source: https://evaljetty.com/openra/runs/r2-rr-sonnet5-gpt56luna-g1.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms