Valve brings Half-Life: Alyx to Steam Frame without changing the game

Valve added standalone Steam Frame gameplay to Half-Life: Alyx on September 14, 2026, turning the former PC VR showcase into a game that can run directly on Valve’s headset without a connected computer. The update includes an ARM64/aarch64 build, standalone foveated rendering and depth reprojection. Valve also says the game’s in-game assets remain unchanged, which preserves the original content and compatibility with Workshop creations.

That combination is the real story: Valve did not make a smaller spin-off or a visually stripped-down edition. It adapted the engine and rendering pipeline for Steam Frame’s mobile-class hardware while keeping Alyx itself intact.

What changed with Half-Life: Alyx on Steam Frame

The Steam Frame version runs locally on the headset rather than streaming the game from a PC. Its standalone build uses ARM64/aarch64 code and adds rendering techniques designed to reduce the workload without discarding the game’s existing assets.

The result is still Half-Life: Alyx, including its original game content. Valve says the lack of content changes also allows existing Workshop content to continue working. For players who have built a library of community-made scenarios and modifications, that matters more than a new launcher badge: the port is intended to carry over the ecosystem around the game, not merely its campaign.

How the standalone port works

The port relies on three important pieces of technology:

• ARM64/aarch64 support: the standalone build is compiled for the processor architecture used by Steam Frame instead of depending only on x86 translation.
• Foveated rendering: the headset concentrates higher rendering detail where the player is looking, using eye tracking to reduce work in peripheral vision.
• Depth reprojection: the system uses headset direction, depth data and motion information to generate additional frames, helping motion appear smoother when the game’s rendered frame rate is lower.

The last point is crucial for reading performance figures correctly. A displayed 72 frames per second can include reprojected frames; it does not necessarily mean that the game rendered 72 complete frames natively.

What SteamOS contributes

SteamOS gives Steam Frame two ways to handle PC VR software. Half-Life: Alyx has a dedicated ARM64 build for standalone execution, while the headset can also stream PC VR games wirelessly through its included 6 GHz adapter and dual radios.

Valve’s broader software stack includes FEX for running x86 games through translation and Lepton for Android VR applications distributed as APKs. Valve has said that Steam partners can target the platform that best fits a game and its audience, and that a PC release is not mandatory for a Steam Frame-compatible Android build.

That makes the Alyx port more than a one-off technical stunt. It is also a demonstration of how Valve wants SteamOS to handle different software layers on hardware that is not a conventional gaming PC.

The hardware behind the experiment

Steam Frame is built around a Qualcomm Snapdragon 8 Gen 3 processor and 16 GB of unified LPDDR5X memory. Its display system uses two LCD panels with 2160 × 2160 pixels per eye. The headset also includes Wi-Fi 7, Bluetooth 5.4 and a 21.6 Wh battery.

The headset includes two controllers, the wireless adapter and Half-Life: Alyx. Valve’s own 45 W power adapter is sold separately, although a compatible USB-C charger rated at least 45 W can be used.

What the performance evidence says

The available performance observations come from different builds and conditions rather than one standardized benchmark. A pre-release hands-on test installed Alyx on the headset, measured roughly four minutes of Vulkan shader optimization during loading and reported about 40–50 frames per second at the lowest settings.

A separate launch report described a 36 FPS rendered rate reprojected to 72 FPS. That figure belongs to the report’s particular observation and conditions; it is not a universal final performance specification for every scene, setting or build. The distinction between rendered and reprojected frames is the important practical detail: reprojection can make headset motion feel smoother, but it does not turn a lower native render rate into 72 fully rendered frames.

Steam Frame’s US price and buying context

In the United States, Steam Frame costs $1,059 with 256 GB of storage or $1,299 with 1 TB. Both configurations include the headset, controllers, wireless adapter and Half-Life: Alyx. The separate power adapter adds another purchase for buyers who do not already have a compatible USB-C charger, and the ergonomic accessories kit is also sold separately.

The hardware therefore makes a specific trade-off. Steam Frame combines local standalone VR with wireless PC VR streaming, but its headline software showcase is a 2020 game adapted for new hardware rather than a new release. For PC VR enthusiasts, the technical achievement is clear: Valve has made the original Half-Life: Alyx run on a headset-sized ARM platform without changing its game assets or abandoning Workshop compatibility.