---
title: "Gemini 3.8 Flash vs GPT-5.6 Terra | OpenRA arena run | Evals by Jetty"
url: https://evaljetty.com/openra/runs/cup1-third-g1.html
description: "GPT-5.6 Terra 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 · Pilot cup · Pilot cup · cup1-third-g1

# Gemini 3.8 Flash vs GPT-5.6 Terra

GPT-5.6 Terra destroyed the enemy base after 4.5 game-minutes · 5.1 min wall clock

Pilot game (run locally, before the Jetty runs)
[Replay (.orarep)](https://evaljetty.com/openra/media/cup1-third-g1.orarep)
[Decision log](https://evaljetty.com/openra/runs/cup1-third-g1/decisions.jsonl)
[Runtime config](https://evaljetty.com/openra/runs/cup1-third-g1/runtime_config.json)
[Validation report](https://evaljetty.com/openra/runs/cup1-third-g1/validation_report.json)

LOSS england · west

Gemini 3.8 Flash

google/gemini-3.8-flash

Value destroyed$2,200Value lost$10,900
Units killed / lost16 / 16Buildings killed / lost0 / 6
Peak army$1,900Orders issued35
Decision turns (failed)35 (0)Mean latency3.2sModel cost$0.105

WIN france · east

GPT-5.6 Terra

openai/gpt-5.6-terra

Value destroyed$10,900Value lost$2,200
Units killed / lost16 / 16Buildings killed / lost6 / 0
Peak army$4,400Orders issued61
Decision turns (failed)35 (0)Mean latency3.3sModel cost$0.241

## Evaluation

No validation report stored for this run.

## 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 Gemini 3.8 Flash**: Starting the match. Deploying MCV immediately to establish our Construction Yard and kicking off Power Plant production.
- **0:00 GPT-5.6 Terra**: Deploy immediately and begin the standard power/economy opening. Enemy is expected in the far northeast, so early production will rally eastward later.
- **0:08 Gemini 3.8 Flash**: MCV is deployed. Need to start building the first Power Plant to power future infrastructure.
- **0:08 GPT-5.6 Terra**: Construction Yard is deployed and the first power plant should be ready to place. Establish ore income immediately, then unlock infantry scouting.
- **0:16 Gemini 3.8 Flash**: Power plant is ready; placing it immediately and starting the Ore Refinery (proc) to jumpstart income. Standard opening sequence progressing smoothly.
- **0:16 GPT-5.6 Terra**: Deploy economy infrastructure immediately: start power, then place it and build a refinery as soon as available.
- **0:24 Gemini 3.8 Flash**: Power plant is placed and functioning. Now queueing our first Ore Refinery to get economy and harvester rolling.
- **0:24 GPT-5.6 Terra**: Deploy the opening power plant immediately, then start the first refinery to establish income. Enemy is expected far east, so prioritize a fast economic opening.
- **0:32 Gemini 3.8 Flash**: Refinery is currently at 23%. Waiting for it to finish constructing so we can deploy our first harvester and establish cash flow.
- **0:32 GPT-5.6 Terra**: Power is online and the first priority is establishing ore income. Start the first refinery immediately, then place it and transition into barracks plus a second refinery.
- **0:40 Gemini 3.8 Flash**: Refinery is currently at 46% completion. Waiting for it to finish so we can place it and immediately start a Barracks (tent).
- **0:40 GPT-5.6 Terra**: First refinery is still under construction. I will place it immediately when ready, then establish infantry production and expand ore income.
- **0:48 Gemini 3.8 Flash**: Refinery is at 70% and almost finished. Once placed, it will provide our first harvester and income stream, and unlock barracks and war factory.
- **0:48 GPT-5.6 Terra**: Refinery is still under construction. I will place it as soon as it completes, then immediately establish infantry production and expand ore income.
- **0:56 Gemini 3.8 Flash**: Refinery is at 94% and will finish in seconds. I'll immediately queue Allied Barracks (tent) as soon as possible, or start it right away if the queue permits; wait, proc is still finishing, so next build command will be queued once placed. Let's make sure we place proc if ready or prepare tent.
- **0:56 GPT-5.6 Terra**: First refinery is nearly complete; place it immediately and begin barracks production infrastructure. Then establish a steady infantry screen while expanding ore income.
- **1:04 Gemini 3.8 Flash**: Refinery is ready to place now. I will place it to start harvesting economy and ensure barracks finishes next.
- **1:04 GPT-5.6 Terra**: First refinery is nearly complete, with the barracks queued behind it. I will place the refinery as soon as it finishes, then immediately establish infantry production and expand toward a war factory.
- **1:12 Gemini 3.8 Flash**: Tent is almost done at 64%. Once finished, I'll place it and build a War Factory to start ramping up vehicle production.
- **1:12 GPT-5.6 Terra**: First refinery is ready and barracks is building. Place the refinery immediately, then use the free harvester for income while preparing infantry production.
- **1:20 Gemini 3.8 Flash**: The tent is ready, so I will place it immediately and queue up a War Factory. I'll also train a rifleman to start scouting toward the enemy's expected start location.
- **1:20 GPT-5.6 Terra**: Barracks is nearing completion and the first refinery is operating. Keep the harvester mining; immediately establish infantry production when the barracks becomes ready, then expand with a second refinery or War Factory.
- **1:28 Gemini 3.8 Flash**: War factory is building nicely. Barracks is now ready, so start training scouts and rocket infantry while queuing light defenses or preparing for the war factory finish.
- **1:28 GPT-5.6 Terra**: Barracks is ready and the economy needs a second refinery immediately. I will begin infantry scouting while expanding income, then transition into a War Factory.
- **1:36 Gemini 3.8 Flash**: War Factory is progressing well. Sending idle infantry to scout across the map towards the enemy base at (12, 16) and queuing light defense/scouting.
- **1:36 GPT-5.6 Terra**: Second refinery is under construction; use the barracks immediately to establish scouting infantry while preserving cash for a War Factory next. Rally infantry east-northeast toward the likely enemy base.
- **1:44 Gemini 3.8 Flash**: War Factory is halfway done. Scout infantry #135 continues moving towards the enemy base at (12, 16) to locate their layout. Once War Factory finishes next turn, we will place it and begin vehicle production.
- **1:44 GPT-5.6 Terra**: Second refinery is progressing and power is ample. I will keep scouting toward the likely enemy start while barracks production builds an infantry screen, then place the refinery and transition into a War Factory.
- **1:52 Gemini 3.8 Flash**: War Factory is nearly complete. Scout rifleman continues advancing toward enemy base at (12, 16), while rocket soldiers assemble to protect home base and refinery.
- **1:52 GPT-5.6 Terra**: Second refinery is nearly ready; place it immediately when available, then start a War Factory. Infantry will continue scouting aggressively toward the likely Soviet base while the harvester mines.
- **2:00 Gemini 3.8 Flash**: War Factory is nearly ready at 82%. Scouting with rifle infantry towards enemy base at (12, 16). Preparing to place War Factory and begin vehicle production.
- **2:00 GPT-5.6 Terra**: Second refinery is nearly complete; place it as soon as it is ready, then save toward a War Factory. The rifle scout continues east while barracks production transitions toward anti-tank rockets.
- **2:08 Gemini 3.8 Flash**: War Factory is finishing; place it immediately and queue another Harvester or Light Tank once funds arrive. Keep scouting towards the enemy base with e1 and maintain rocket soldiers defensively.
- **2:08 GPT-5.6 Terra**: Second refinery is ready and should be placed immediately to accelerate income. Our infantry scouts are advancing east; keep them together and continue pushing toward the likely enemy start while the existing barracks queue completes.
- **2:16 Gemini 3.8 Flash**: War Factory is ready to place now. We will place it, start a second Ore Refinery to ramp economy, and keep scout infantry probing towards enemy coordinates (12, 16).
- **2:16 GPT-5.6 Terra**: Second refinery is established and infantry scouts are advancing east. Power must be expanded before the planned War Factory; keep harvesters mining while rifle groups continue scouting toward the enemy start.
- **2:24 Gemini 3.8 Flash**: War Factory is placed; currently building a second Refinery to boost economy. Cash is at $0, waiting for harvester dump, while scouting westward towards enemy base.
- **2:24 GPT-5.6 Terra**: Place the ready power plant to preserve power headroom while income accumulates for a War Factory. Push all available infantry east toward the likely enemy start, keeping pressure and scouting active.
- **2:32 Gemini 3.8 Flash**: Harvester is currently gathering ore at (107, 22), so cash is temporarily $0 while the second refinery builds. Scout team of rocket soldiers is pushing west toward the enemy base at (12, 16). Continue moving the forward squad to uncover enemy territory.
- **2:32 GPT-5.6 Terra**: Infantry is advancing across the center with no enemy contact yet. Continue pressure toward the likely enemy start while banking briefly for the War Factory and adding cheap rifle reinforcements.
- **2:40 Gemini 3.8 Flash**: Proc is building and harvester is about to unload. Continuing push towards enemy base while taking out isolated scout #138.
- **2:40 GPT-5.6 Terra**: Two refineries are funding the War Factory, so conserve cash until it can be started. Keep the entire infantry force advancing toward the likely Soviet start to scout and pressure while avoiding more rifle production for now.
- **2:48 Gemini 3.8 Flash**: Current funds are low with proc at 34% completion. We need the second refinery to boost our economy, then we can pump light tanks and rocket infantry.
- **2:48 GPT-5.6 Terra**: Our infantry column is nearing the likely enemy side without contact, while income from two refineries is healthy. Keep pressure advancing northeast and use available funds for anti-vehicle rocket support while saving toward a War Factory.
- **2:56 Gemini 3.8 Flash**: Second Ore Refinery is currently building at 42%. With zero cash in bank, we need to wait for harvester #130 to unload and proc to complete before queuing vehicles.
- **2:56 GPT-5.6 Terra**: Our infantry spearhead is at the likely enemy start and should press immediately while reinforcements continue advancing. Cash is still short of a War Factory, so keep the barracks output flowing and concentrate all combat units on the enemy location.
- **3:04 Gemini 3.8 Flash**: Enemy rifle infantry squad is pressing right outside our base; use our 2 riflemen to eliminate the weak ones while holding near the base. Cash is zero while proc builds; let the harvester unload to finish proc and then queue power and 1tnk.
- **3:04 GPT-5.6 Terra**: Our infantry spearhead is nearing the likely enemy start and has not met resistance, so keep sweeping east while establishing vehicle production. Economy and power are healthy enough for a War Factory immediately.
- **3:12 Gemini 3.8 Flash**: Power is critically low and our only power plant is damaged, slowing our second refinery production. We need to hold off the small squad of enemy riflemen near our base with our infantry and train defensive units as cash trickles in.
- **3:12 GPT-5.6 Terra**: War Factory is nearly complete and our forward infantry screen is approaching the likely enemy base without visible resistance. Keep pressure toward the northeast while adding a modest base defense; spend incoming income on vehicles immediately after the factory completes.
- **3:20 Gemini 3.8 Flash**: We have 0 power and 80 used, crippling production, while an enemy infantry squad is pressing into our base at (90, 10). We must immediately build and place power, start vehicle production (Light Tank) from our War Factory, and hold off the infantry with defensive units.
- **3:20 GPT-5.6 Terra**: Our forward force is nearing the enemy start and has contact with a lone rifleman. War Factory and Pillbox are close to ready; keep pressure while preserving the base guard and prepare vehicle production.
- **3:28 Gemini 3.8 Flash**: Power is urgently needed to restore production speed; currently building a power plant. Enemy infantry horde is right outside our base at (90,10), so repair damaged buildings and keep unit queues running.
- **3:28 GPT-5.6 Terra**: Our infantry spearhead has reached the likely enemy start, but the base remains hidden. Keep pressure on the visible defender and push the entire force through the suspected base area while production completes.
- **3:36 Gemini 3.8 Flash**: Power plant is nearly complete; once placed it will restore power and speed up our 1tnk production. Enemy infantry swarm is right outside our base around (90,10), so queue rocket soldiers/riflemen and keep our lone rifleman defensively positioned near the buildings.
- **3:36 GPT-5.6 Terra**: Our infantry mass has reached the enemy start area, but no enemy structures are yet visible. Place the ready pillbox for home defense, complete the War Factory, and keep the entire force pressing into the likely enemy base while rocket production continues.
- **3:44 Gemini 3.8 Flash**: Place the ready power plant immediately to restore power and speed up production. The enemy has a large infantry squad right outside our base; repair ConYard and Barracks, start a Pillbox, and prepare defending units to repel them.
- **3:44 GPT-5.6 Terra**: War Factory is nearly ready while our large infantry force is pressing toward the likely enemy start. Keep the attack moving and rally fresh infantry east; place the factory immediately when it completes, then shift to armor production.
- **3:52 Gemini 3.8 Flash**: We have lost our ConYard and power, and an enemy infantry swarm is attacking our base around (91-93, 11-13). We need our 1tnk to finish and defend, and prioritize repairing the tent and weapon factory while keeping harv safe.
- **3:52 GPT-5.6 Terra**: War Factory is nearly complete while our infantry force is pressing into the likely enemy start area. Keep all troops advancing to reveal and engage the enemy base, then immediately place the factory and transition into tanks.
- **4:00 Gemini 3.8 Flash**: A large mass of enemy infantry is right outside the refinery and war factory. Light tank is completing soon; we can also use our harvester to crush infantry. Order repairs on refinery and queue another light tank.
- **4:00 GPT-5.6 Terra**: Our forward infantry force is already on the exposed enemy refinery and can likely cripple their economy immediately. The War Factory is nearly ready; place it as soon as possible and transition into vehicle production once income resumes.
- **4:08 Gemini 3.8 Flash**: Enemy infantry swarm is right next to our surviving buildings. Use Harvester #130 and Light Tank #198 to run over and eliminate the infantry immediately. Repair proc while defending.
- **4:08 GPT-5.6 Terra**: Our infantry swarm is inside the enemy base and their refinery is nearly destroyed; focus it down and then eliminate the exposed War Factory. The War Factory at home is nearly ready, so keep income flowing and prepare to place it immediately next turn.
- **4:16 Gemini 3.8 Flash**: Base is under heavy infantry siege, proc #129 is nearly dead. I must use harvester #130 and tank #198 to aggressively run over the infantry swarm right next to them.
- **4:16 GPT-5.6 Terra**: Enemy refinery is nearly destroyed and their war factory is damaged; finish both while rockets focus the defending tank. War Factory will be placed as soon as it completes, then expand vehicle production and keep infantry pressure flowing.
- **4:24 Gemini 3.8 Flash**: Our base and army have been virtually eliminated; only a damaged War Factory remains with $0 and no harvesters, surrounded by enemy infantry. We will sell the War Factory if possible to extract any salvage cash/infantry or attempt to survive, though sell may not be supported directly or worthwhile, let's repair #160 and cancel queued tanks to regain any partial funds.
- **4:24 GPT-5.6 Terra**: Our infantry and rocket force is already inside the exposed enemy base, with their damaged War Factory visible at 97,8. Place our War Factory immediately, keep infantry production flowing, and finish the enemy production building while the assault force sweeps the base.
- **4:32 Gemini 3.8 Flash**: We have been completely wiped out with 0 buildings, 0 units, and $0 cash. The game is lost.
- **4:32 GPT-5.6 Terra**: Our forward infantry mass is sitting directly on the enemy start area, so it should sweep through the base immediately. The new War Factory should begin producing armor as income arrives, while a Service Depot unlocks Medium Tanks.

---
Source: https://evaljetty.com/openra/runs/cup1-third-g1.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms