update · November 5, 2026
Stellaris Experimental Patch 4.5.3 Adjusts AI Resource Logic and Fixes Tooltip UI
Stellaris version 4.5.3 arrives on the experimental test branch, overhauling how AI empires manage resource stockpiles and fixing persistent UI tooltip bugs.
A new experimental build for Stellaris version 4.5.3 is available on the stellaris_test branch on Steam. This update targets risky systems, changing how artificial intelligence empires handle market trades and resource caps while clearing up redundant modifier text across the user interface. Developers note that these changes are experimental and may be tweaked or omitted before the eventual 4.6.0 release.
AI Stockpile and Market Overhaul
AI empires now sell excess resources on the market before their stockpiles hit maximum capacity, preventing wasted income. When trade stockpiles grow nearly full, empires spend surpluses on resources they actually consume based on current expenses. Nomad AI factions now trade according to their operational reserves. Furthermore, artificial intelligence empires stop spending currency on market purchases that exceed storage limits, avoid selling strategic resources beneath their personal minimums, and no longer stall for weeks when preferred trade items are unavailable. AI empires that hit pop or naval capacity targets continue setting new goals, and Nomad AI factions with high fleet usage apply all naval capacity plans.
Tooltip and UI Cleanups
Planetary pop group upkeep and production tooltips now display active modifiers alongside base values. Arkship tooltips no longer exhibit cut-off text or placeholder labels. FTL windup tooltips accurately show megastructure bypass windup modifiers from their actual sources. Static modifiers, such as those from Ascension Perks, support custom descriptions with parameters. The update removes repeated entries in modifier tooltips for metrics like happiness, workforce, crime, stability, and build speeds. Leader skill, job tooltips, and empire size readouts no longer duplicate source names under their labels.
Stability and Modding Additions
The patch fixes a potential game crash that occurred when inspecting the skill tooltip of an Arkship governor or other leaders. Minor memory leaks originating from relics, ship sections, and psionic auras during game load and mod reloads are resolved. For modders, trait descriptions equipped with exclusive triggers now correctly replace other tooltip text only when those triggers evaluate to true, and the print_modifiers console command now displays pop group modifiers.
Why this patch matters
This experimental update tackles AI resource management inefficiencies and cleans up cluttered tooltips, offering a quality-of-life pass for interface readability.