AI players

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This article may contain outdated information that is inaccurate for the current version of the game. It was last updated for 2.3.

This article is for the PC version of Stellaris only.

AI players refers to regular empires that are controlled by the AI. Unlike human players the AI is relatively predictable as it follows scripted guidelines.

Warfare Behavior[edit]

  • AI players will only declare war when they use at least 50% of their naval capacity and have at least 6 assault armies
  • AI players will only attack systems if their Fleet Power is 20% stronger than that of the opponent's
  • AI players will never retreat if they own less than 3 systems
  • AI players will always retreat when they lost 50% of a fleet in a space battle
  • AI players will never defend attacked systems if their Fleet Power is lower than that of the opponent's
  • AI players will only use the Indiscriminate or Armageddon Bombardment stances if their attitude is hostile
  • AI players will never Jump into an enemy system unless its fleet has at least 33% more Fleet Power
  • AI players will always attack targets in the following order: Occupied systems > Fleets weakened by use of Jump Drive > Systems with colonies > Upgraded Starbases / Fleets / Systems they claimed > Other targets

Aggressiveness Behavior[edit]

  • AI players are 2 times more likely to declare war if they can't expand in systems with habitable planets
  • AI players are 4 times more likely to declare war if they can't expand in any system
  • AI players are 10 times more likely to declare war if they can't expand and are Auth hive mind.png Hive Mind or Civic machine assimilator.png Driven Assimilator

Claims Behaviour[edit]

  • AI players that are independent will only make Claims on systems up to 4 hyperlane jumps from their borders
  • AI players that are subjects will only make Claims on systems up to 2 hyperlane jumps from their borders
  • AI players will always claim systems that have various features in the following order: Bordering them > Colony > Gateway/Wormhole > Natural resources > Other systems

Slave Market Behavior[edit]

  • AI players will not buy slaves if they have less than 2000 Energy Credits.png Energy
  • AI players will not sell slaves if they have more than 5000 Energy Credits.png Energy
  • AI players will always sell a Pop if they have at least 3 Unemployed Pops on a planet
  • AI players will always sell a Pop if they have at least 6 Unemployed Pops across the empire

Starbase Behavior[edit]

  • AI players will always build Starbases in systems that have various features in the following order: Gateway/Wormhole/Colonizable > Natural resources > Other systems
  • AI players will always upgrade Starbases in systems that have various features in the following order: Gateway/Wormhole > Megastructure > Colony > Habitable planets > Choke point > Uninhabitable systems

Other[edit]

  • AI players will only colonize worlds that have at least 35% Mod habitability.png Habitability for any of their species
  • AI players will never use ambition Edicts until they unlocked all Traditions
  • AI players will never Embrace a Faction unless more than 50% of its population belong to it
  • AI players will never sell more than 30% of their stockpile for any resource
  • AI players will not send a diplomatic request of the same type for 27 years if the previous one was rejected
  • AI players will only enlighten primitive civilizations if they reached at least Steam Age
  • AI players will only attack Leviathans if they have at least 40k Fleet Power
  • AI players will only construct Megastructures in systems that are surrounded by other owned systems
  • AI players that are Civic fanatic purifiers.pngCivic devouring swarm.pngCivic machine terminator.png Genocidal will attack enclaves once their Fleet Power is twice stronger

Civilian Ships[edit]

AI players will always try to have these many civilian ships:

Ship Nr.
Science Ship 2
+1 for every 15 owned systems
Construction Ship 2
+1 for every 10 owned systems
Colony Ship 1

Fleet Composition[edit]

AI players will use the following weights when building new ships for its fleets:

Size Weight
Corvette 100
75 if researched Tech destroyers.png destroyers tech
30 if researched Tech cruisers.png cruisers tech
25 if researched Tech battleships.png battleships tech
Destroyer 50
35 if researched Tech cruisers.png cruisers tech
25 if researched Tech battleships.png battleships tech
Cruiser 35
25 if researched Tech battleships.png battleships tech
Battleship 25

The AI will always build a Titan if it has the technology. It will build a second one if it has the resources but will never try to have more than two.

Army Composition[edit]

AI players will always try to have 10 armies, with an additional army for every 50 Pops up to a cap of 50 armies. They will always recruit only one type of army, with the following conditions:

Army Conditions
Army assault.png Assault Army
  • No.png Tech telepathy.png Telepathy technology
  • No.png Tech gene seed purification.png Gene Seed Purification technology
  • No.png Tech neural implants.png Neural Implants technology and uses slaves
  • No.png Tech droid workers.png Droids technology and Artificial Intelligence policy is set to Citizen Rights
  • No.png Tech gene banks.png Gene Banks technology and Militarist.png Militarist or Fanatic Militarist.png Fanatic Militarist
Army slave.png Slave Army
  • Yes.png Tech neural implants.png Neural Implants technology and uses slaves
  • No.png Tech telepathy.png Telepathy technology
  • No.png Tech gene seed purification.png Gene Seed Purification technology
Army robotic.png Robotic Army
  • Yes.png Tech droid workers.png Droids technology and Artificial Intelligence policy is set to Citizen Rights
  • No.png Tech telepathy.png Telepathy technology
  • No.png Tech gene seed purification.png Gene Seed Purification technology
Army clone.png Clone Army
  • Yes.png Tech gene banks.png Gene Banks technology and Militarist.png Militarist or Fanatic Militarist.png Fanatic Militarist
  • No.png Tech telepathy.png Telepathy technology
  • No.png Tech gene seed purification.png Gene Seed Purification technology
Army psionic.png Psionic Army
  • Yes.png Tech telepathy.png Telepathy technology
  • No.png Tech gene seed purification.png Gene Seed Purification technology
Army gene warrior.png Gene Warrior Army Yes.png Tech gene seed purification.png Gene Seed Purification technology
Army assault m.png Hunter-Killer Army No.png Tech adaptive combat algorithms.png Adaptive Combat Algorithms technology
Army assault m.png Battle Frame Army Yes.png Tech adaptive combat algorithms.png Adaptive Combat Algorithms technology

Ascension Perks[edit]

AI players will choose an Ascension Perk as soon as a slot is available with the following weights:

Ascension Perk Weight
Ap world shaper.png World Shaper 5
Ap executive vigor.png Executive Vigor 10
Ap transcendent learning.png Transcendent Learning 10
Ap imperial prerogative.png Imperial Prerogative 10
Ap consecrated worlds.png Consecrated Worlds 10
Ap mastery of nature.png Mastery of Nature 1
5 if second Ascension Perk
10 if first Ascension Perk
Ap one vision.png One vision 10
20 if Authoritarian.png Authoritarian or Spiritualist.png Spiritualist
30 if Fanatic Authoritarian.png Fanatic Authoritarian or Fanatic Spiritualist.png Fanatic Spiritualist
Ap technological ascendancy.png Technological Ascendancy 10
20 if Materialist.png Materialist
30 if Fanatic Materialist.png Fanatic Materialist
Ap interstellar dominion.png Interstellar Dominion 10
20 if Xenophobe.png Xenophobe
30 if Fanatic Xenophobe.png Fanatic Xenophobe
Ap reach for the stars.png Grasp the Void 10
15 if Xenophobe.png Xenophobe
30 if Civic inwards perfection.png Inwards Perfection
Ap eternal vigilance.png Eternal Vigilance 10
15 if Xenophobe.png Xenophobe
30 if Civic inwards perfection.png Inwards Perfection
Ap galactic force projection.png Galactic Force Projection 10
15 if below 20 colonies
20 if below 10 colonies
x2 if Militarist.png Militarist
x3 if Fanatic Militarist.png Fanatic Militarist
Ap galactic contender.png Galactic Contender 10 if a neighbor is a Fallen Empire
20 if any Fallen Empire awakened
Ap shared destiny.png Shared Destiny 5 if has any Diplomacy isvassal.png Vassal
Ap defender of the galaxy.png Defender of the Galaxy 20 if a crisis is happening
Ascension Perk Weight
Ap hive worlds.png Hive Worlds 10
Ap machine worlds.png Machine Worlds 10
Ap synthetic age.png Synthetic Age 10
Ap universal transactions.png Universal Transactions 10
Ap enigmatic engineering.png Enigmatic Engineering 10
20 if Materialist.png Materialist
30 if Fanatic Materialist.png Fanatic Materialist
Ap voidborn.png Voidborn 10
20 if Pacifist.png Pacifist
30 if Fanatic Pacifist.png Fanatic Pacifist
Ap galactic wonders.png Galactic Wonders 10
20 if Pacifist.png Pacifist
30 if Fanatic Pacifist.png Fanatic Pacifist
Ap master builders.png Master Builders 10
20 if Pacifist.png Pacifist
30 if Fanatic Pacifist.png Fanatic Pacifist
Ap arcology project.png Arcology Project 10
20 if Pacifist.png Pacifist
30 if Fanatic Pacifist.png Fanatic Pacifist
Ap xeno compatibility.png Xeno-Conpatibility 10
20 if Xenophile.png Xenophile
30 if Fanatic Xenophile.png Fanatic Xenophile
Ap colossus project.png Colossus Project 10
x2 if Militarist.png Militarist
x2 if Xenophobe.png Xenophobe
x10 if Civic fanatic purifiers.png Fanatic Purifiers
x10 if Civic machine terminator.png Determined Exterminator
x0.25 if Pacifist.png Pacifist
x0.1 if Xenophile.png Xenophile
Ap nihilistic acquisition.png Nihilistic Acquisition 10 if it can enslave aliens
Ascension Perk Weight
Ap engineered evolution.png Engineered Evolution 10
0 if below 10 colonies
Ap evolutionary mastery.png Evolutionary Mastery 100
Ap the flesh is weak.png The Flesh is Weak 2
20 if Materialist.png Materialist or Fanatic Materialist.png Fanatic Materialist
0 if below 10 colonies
Ap synthetic evolution.png Synthetic Evolution 100
Ap mind over matter.png Mind over Matter 2
20 if Spiritualist.png Spiritualist or Fanatic Spiritualist.png Fanatic Spiritualist
0 if below 10 colonies
Ap transcendence.png Transcendence 100

Relics[edit]

AI players will use the following weights when activating a Relic:

Relic Weight
R war forge.png Cybrex War Forge 100
R pox sample.png Javorian Pox Sample 100
R orb insight.png Vultaum Reality Perforator 100
R cryo core.png Yuht Cryo Core 100
R contingency core.png Isolated Contingency Core 100
R prethoryn queen.png Prethoryn Brood-Queen 100
R worm scales.png Scales of the Worm 100
R dragon trophy.png Ether Drake Trophy 100
R ancient sword.png Blade of the Huntress 100
R severed head.png Head of Zarqlan 100
R baol.png The Last Baol 100
R surveyor.png The Surveyor 120
R zro crystal.png Psionic Archive 200
R galatron.png The Galatron 200
Relic Weight
R unbidden warlock.png Extradimensional Warlock 10
40 if at war
R rubricator.png The Rubricator 75
150 if below 30 Minor artifacts large.png Minor Artifacts
R khans throne.png Khan's Throne 100
x2 if Militarist.png Militarist or Fanatic Militarist.png Fanatic Militarist
x3 if at war
R mechano calibrator.png The Defragmentor 100
115 if Auth machine intelligence.png Machine Intelligence
R galaxy.png Miniature Galaxy 100
150 if Materialist.png Materialist or Fanatic Materialist.png Fanatic Materialist
R omnicodex.png The Omnicodex 100
200 if Xenophile.png Xenophile or Fanatic Xenophile.png Fanatic Xenophile