Arknights: Endfield Comes to Steam October 15 With the Sanctuary of Ink Update

Arknights: Endfield is officially coming to Steam on October 15, 2026.

The Steam release arrives on the same day as the game's next free content update, Sanctuary of Ink, which expands the story and adds new characters, activities, and progression content.

View Arknights: Endfield on Steam

Steam Players Can Join on October 15

Until now, PC players have primarily accessed Arknights: Endfield through its existing PC distribution options.

The Steam version gives the free-to-play RPG access to Valve's storefront and community ecosystem.

GRYPHLINE says existing players will be able to use cross-platform progression, so moving to Steam does not mean starting over from scratch.

Sanctuary of Ink Is Version 1.6

The October 15 launch lines up with version 1.6, titled Sanctuary of Ink.

The update sends players into a painted world connected to the character Si and introduces a new story chapter built around the Endministrator's recovery and past.

The visual direction leans heavily into ink painting, brush strokes, and landscape art.

Two New Operators

The update introduces new Operators Si and Argent Flow.

They join the existing roster alongside new combat challenges and progression opportunities.

For current players, the new Operators are likely to be one of the biggest reasons to return when version 1.6 launches.

More Than Story Content

Sanctuary of Ink also expands the game's management and exploration systems.

The update includes new activities tied to the painted world and additional content around building and managing locations.

That matters because Endfield is not only an action RPG. It also mixes combat with industrial systems, exploration, and base-building elements.

Steam Requirements to Know

The Steam page lists Arknights: Endfield as free to play with in-game purchases.

It also requires a GRYPHLINE account and uses Anti-Cheat Expert, including kernel-level anti-cheat components.

Players who are sensitive to anti-cheat software should review the Steam disclosure before installing.

Why the Steam Launch Matters

Steam can significantly improve discoverability for PC games.

For an existing live-service title, moving onto Steam also lowers the friction for users who prefer to keep most of their PC library inside one launcher.

Cross-platform progression makes that transition much easier because existing progress can follow the player.

The Bottom Line

Arknights: Endfield launches on Steam October 15 alongside Sanctuary of Ink version 1.6.

The update adds a new story chapter, new Operators, fresh activities, and cross-platform progression.

For existing players, it is a major content update. For new PC players, the Steam launch is the easiest entry point yet.