Stellaris 4.5 Cygnus Open Beta Update 4 is a short patch with a deceptively long post. Paradox lists the fixes introduced by e6fd first, then reproduces a much larger set of notes from earlier beta releases. The Consecrate World redesign, Knight upkeep changes, and the Paladin Ship computer appear in that compilation. They were not introduced by the July 15 update.
Update, October 26, 2026: Stellaris 4.5 “Cygnus” was released on September 22 after nine beta updates, and its release notes carry these fixes. The final version breaks 4.4 save compatibility, so back up before migrating.
The actual Update 4 is less dramatic and more useful. It repairs event chains that could disappear, an economy calculation that could spiral out of control, and a starbase state that could remain locked inside an existing save.
Precursor chains and Fear of the Dark work again
The broadest fix targets a script regression. Archaeology sites for the Vultaum, Yuht, First League, Irassian, and Cybrex Precursors could fail to appear while surveying. The hostile empire required by Fear of the Dark could also fail to spawn.
Those are not minor balance issues. A campaign could silently lose a major narrative chain with no clear indication that anything had broken. Paradox says the same regression affected other events, decisions, and buildings, particularly for Nomad empires.
The notes do not promise to reconstruct every missed opportunity in a campaign that has already surveyed most of the galaxy. They fix the cause for subsequent checks. Starting a fresh campaign remains the cleanest way to verify a Precursor chain from its opening steps.
Commercial Pact values stop destabilizing Federations
The most visible economic bug involved trade value from Commercial Pacts inside Federations. Under the automatic Commercial Pact law, the number could swing from almost nothing to an enormous value from one month to the next. Budgets and trade policies became impossible to judge because the underlying value was not stable.
Update 4 stops that runaway growth. Affected commercial saves are worth reopening and observing for several in-game months. This is not a Federation buff. It restores a calculation that players can plan around.
The distinction matters because the compiled section also contains older changes to automatic agreements between Federation members. Those rules belong to the wider Cygnus beta. The July 15 patch fixes the value that was compounding incorrectly.
Locked starbase queues repair on load
After a controller change at the end of a war, a starbase construction queue could remain locked indefinitely. Paradox explicitly says affected saves are repaired when loaded. This is the most reassuring fix in the update: it requires neither a new campaign nor a console workaround.
Automated science ships receive two quality-of-life corrections as well. They spread out again instead of clustering in the same highest-weight system, and the Anomaly, Archaeological Site, and Astral Rift views now show the assigned scientist while automation is active.
These changes do not redesign exploration. They remove behavior that made automation look irrational while hiding the information needed to understand what each ship was doing.
What Update 4 did not introduce
Consecrate World still received an important redesign during the Cygnus beta: restricted eligible worlds and deterministic empire-wide bonuses at one, two, and three consecrated worlds. It appears under Previous 4.5 Open Beta Release Notes. The same applies to Knights, Arkships, Rogue Servitors, and the Paladin Ship.
Treating the full compilation as an e6fd changelog turns an archive into a false timeline. Update 4 is a reliability patch. For players hit by these bugs, that is enough to make it essential. Everyone else gets a more dependable beta while Paradox prepares the next revision.