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Stellaris
Stellaris
4.5|Jul 7, 2026
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Stellaris 4.5 'Cygnus' Open Beta updated (bfcc)

3/5 Moderate

BETAMajor pop ethics and faction rework alongside new auto-designer policies and native Apple Silicon support.

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Key Changes

  • 1Pop ethics and factions reworked into a percentage-based distribution system
  • 2Save game compatibility is broken due to the pop system overhaul
  • 3Native Apple Silicon support added for macOS users
  • 4New Fleet Doctrine and Weapon/Defense Preference policies for ship design automation
  • 5Consecrate World reworked into a deterministic empire-wide bonus system
  • 6Independent selection of map, flag, and ship colors in Empire Creation
  • 7Federations can now enact laws for automatic Commercial Pacts and Research Agreements
  • 8Knights of the Toxic God and Cosmogenesis content unlocked for Nomadic empires
  • 9Fixed Deep Scan success rates which were significantly lower than intended
  • 10Optimized pop faction calculations and fleet order checks for better late-game performance

All Changes

👥Pop Systems & Ethics(7)

  • changePop Groups: Pop groups are no longer divided by Ethics or Factions; instead, each group has a percentage belonging to each faction/ethic.
  • changeSave Games: This update is a breaking change and will not preserve save game compatibility.
  • changePops: Pops now shift ethics and factions more frequently.
  • changePop Groups: Pop group faction conversion happens more frequently.
  • changeFactions: Ethic attraction now directly impacts faction growth.
  • changeFactions: Simplified the randomization logic for factions.
  • fixEthics: Fixed issue where pop and country ethics were being permanently wiped across the galaxy during play.

🚀Ship Design & AI(8)

  • newFleet Doctrine: Added Fleet Doctrine policy with six doctrines to determine tactical roles for automated ship designs.
  • newShip Designer: Added Weapon Preference and Defense Preference policies to steer automated ship designs and tech research.
  • newStarbases: Added Starbase-specific Weapon and Defense Preference policies.
  • changeAI: AI empires now adopt fleet doctrines and weapon preferences matching their personality.
  • changeShip Designer: Auto-generated ship designs are now fully regenerated when new technology is researched.
  • changeAI: AI empires now research technologies matching their preferred weapon and defense types more eagerly.
  • fixShip Designer: Fixed auto-generated ships occasionally receiving two sections in a single section slot.
  • fixStrike Craft: Carrier-computer ships now use the longer of their weapon or strike craft range for positioning.

🛸Nomadic Empires & Origins(6)

  • newKnights of the Toxic God: Unlocked Knights of the Toxic God for Nomads.
  • newCosmogenesis: Cosmogenesis is now available for Nomads.
  • newStorm Chasers: Added a nomad-compatible version of Storm Chasers with functional Storm Attraction for arkships.
  • fixNomadic Empires: Nomadic Empires now gain ownership of defeated Arkships and Waystations after Total War status quo victory.
  • newNomadic Empires: Nomadic Empires now steal a percentage of population from planets they destroy during Total Wars.
  • changeNomadic Purge Vassals: Nomadic Purge Vassals now provide resources to their Overlord through subject taxes.

🤝Diplomacy & Federations(4)

  • newFederations: Federations can now enact laws for free, automatic Commercial Pacts and Research Agreements.
  • buffTrade League: Trade League federations now provide free, automatic Commercial Pacts and Wayline Pacts between all members.
  • changeContracts: Regular Empires can now cancel accepted contracts after 20 years.
  • buffFederation Code: The 'Federation Code' technology now reduces Diplomacy influence upkeep by 25%.

⚖️Balance(6)

  • changeConsecrate World: Consecrate World reworked to grant deterministic empire-wide bonuses to Unity, Amenities, and Ethics Attraction (+10%/20%/40% based on count).
  • buffCybernetic: Cybernetic species trait now provides an additional +5% Job Efficiency.
  • nerfKnights: Increased base knights upkeep by 0.15 alloys and 0.15 consumer goods.
  • buffScientific Arkships: Scientific Arkships now have +5% Deep Scanning Success Chance per Tier.
  • buffThe Collective Self: The 'The Collective Self' technology now grants +1 Envoy.
  • changeTrade Policy: Trade Policy now correctly converts trade value from Commercial Pacts and Branch Offices.

💻Performance & Technical(3)

  • newApple Silicon: macOS builds now run natively on Apple Silicon as a universal binary, removing Rosetta 2 requirement.
  • fixPerformance: Optimized pop faction attraction calculations to improve mid- and late-game performance.
  • fixPerformance: Reduced CPU and memory overhead of per-fleet order checks.

🖥️UI/UX(4)

  • newEmpire Creation: Added independent selectors for map border and fill colors in empire creation.
  • newEmpire Creation: Ship Color can now be selected independently from flag colors.
  • changePolicies: Policies are now grouped into collapsible categories with status indicators.
  • changePlanetary Management: Building slots are now highlighted when selected.

Summary

The 4.5 'Cygnus' Open Beta 2 introduces a fundamental overhaul of pop ethics and factions, moving from discrete groups to a percentage-based distribution system. This update also grants players and AI significantly more control over ship design through new Fleet Doctrine and Weapon Preference policies. Additionally, Mac users can now run the game natively on Apple Silicon, and Nomadic empires receive expanded access to the Knights of the Toxic God and Cosmogenesis content.

← OlderStellaris 4.4.5 patch released (2f57)Jul 7, 2026Newer →Stellaris Dev Diary #428 - 4.5 ‘Cygnus’Jul 9, 2026

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