Official specs from Steam

Assassin's Creed Odyssey system requirements

Minimum and recommended PC specs as listed by the developer on Steam.

Minimum

NoteRequires a 64-bit processor and operating system
OSWindows 10 (64bit versions only)
ProcessorAMD FX 6300 @ 3.8 GHz, Ryzen 3 - 1200, Intel Core i5 2400 @ 3.1 GHz (MORE DETAILS HERE)
Memory8 GB RAM
GraphicsAMD Radeon R9 285, NVIDIA GeForce GTX 660 (2GB VRAM with Shader Model 5.0) (MORE DETAILS HERE)
DirectXVersion 11
Storage46+ GB available space
Additional NotesVideo Preset: Lowest (720p)

Recommended

NoteRequires a 64-bit processor and operating system
OSWindows 10 (64bit versions only)
ProcessorAMD FX-8350 @ 4.0 GHz, Ryzen 5 - 1400, Intel Core i7-3770 @ 3.5 GHz or better (MORE DETAILS HERE)
Memory8 GB RAM
GraphicsAMD Radeon R9 290, NVIDIA GeForce GTX 970 (4GB VRAM with Shader Model 5.0) or better (MORE DETAILS HERE)
Storage46+ GB available space
Additional NotesVideo Preset: High (1080p)

FAQ

What graphics card do I need for Assassin's Creed Odyssey?

Minimum: AMD Radeon R9 285, NVIDIA GeForce GTX 660 (2GB VRAM with Shader Model 5.0) (MORE DETAILS HERE). Recommended: AMD Radeon R9 290, NVIDIA GeForce GTX 970 (4GB VRAM with Shader Model 5.0) or better (MORE DETAILS HERE).

How much RAM does Assassin's Creed Odyssey need?

Assassin's Creed Odyssey needs 8 GB RAM at minimum, 8 GB RAM recommended.

How big is Assassin's Creed Odyssey?

Assassin's Creed Odyssey requires 46+ GB available space.

Does Assassin's Creed Odyssey run on Mac or Steam Deck/Linux?

There is no native macOS version. There is no native Linux build (Proton compatibility may vary).