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Stellaris Dev Diary #432 - Yet More About 4.5 'Cygnus'

Stellaris · Community Announcements · September 10, 2026

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by Eladrin

Hello everyone, I’m back this week, though it’ll be a relatively short one. Last week Alfray mentioned that I might be ready to share information about the 4.5 ‘Cygnus’ release date, but I’m holding onto that for a bit longer to get more branch stabilization and fixes in. Today’s Open Beta update includes a few more fixes, but we’re slowing down as the team is focusing on stabilizing the release. Hopefully we’ve gotten a few that you’ve been waiting for.

Stellaris 4.5 ‘Cygnus’ Open Beta Update #9 Release Notes

Improvement

Balance

Bugfix

UI/UX​

Stability

Modding​

Anything Else Sneaking In?​

There are a few changes that - at the time of writing this dev diary, I’m not sure will make it into today’s Open Beta update, but are currently in review. See the actual release post to see whether they made it in, or whether they’ll be in the next one. The AI changes might be related to why I’m holding the release date announcement at least a week.

Stabilization? How about we rewrite some core AI economy code instead?

Bugfix

AI

Modding

The intent of the AI changes is to make sure that the AI always has something to aim for - two issues were found and fixed that could cause it to get stuck on certain plans. If it lost its income goals or found itself so rich it was continuously building, the AI could also end up in situations where it would not re-evaluate planetary designations on a reasonable timeframe - sometimes very counterproductively. (Previously, the AI would not re-evaluate designation if there was anything in their build queue of the planet, but a healthy economy is often building things. Frustratingly, this could mean that if they have an Urban World designated that they wanted to turn into a Tech World, they’d build a Research District Specialization, start building City Districts, and then queue up a turning the Research District Specialization into a Commercial one because Urban Worlds should be trade focused.) We’ve changed the targets for scaling goals to be the requirements of the next tier, encouraging the AI to climb the economic ladder instead of overinvesting in whatever it got good at first. Population or Naval Capacity can now also no longer lock the AI to a lower economic tier plan - though it will still influence what it chooses to build. The AI tended to oscillate around its income targets - it liked to prioritize things it was closest to reaching, and then the moment a resource hit its target, that resource would immediately lose all its build priority and consumers of it gained priority. We’ve also made it recognize economic emergencies three months before their stockpile depletes, giving them a better chance to react and build out in time (especially for things like minerals). It’ll now also buy resources from the market if it’s set to run out within six months. Some of the other adjustments are behavioral tweaks - bioship empires now continue to increase their food targets like how regular ones increase their alloy targets, and a change so they’ll prioritize strategic resources before their income goes negative. Naval Capacity structures are now also scored based on the Naval Capacity they provide instead of equally as “this structure provides Naval Capacity”. We expect these changes to provide some improvements to the AI’s ability to keep up with you, and we’ll continue to iterate over the remainder of the Open Beta and beyond.

What’s Next?​

I’m pretty confident that next week’s dev diary will include a release date announcement.

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