Xbox Series X and Series S

The Xbox Series X and Xbox Series S are the fourth generation of consoles in Microsoft's Xbox series, succeeding the previous generation's Xbox One. Released on November 10, 2020, the higher-end Series X and lower-end Series S are part of the ninth generation of video game consoles, which also includes Sony's PlayStation 5, released the same month.

Like the Xbox One, the consoles use an AMD 64-bit x86-64 CPU and GPU. Both models have solid-state drives to reduce loading times, support for hardware-accelerated ray-tracing and spatial audio, the ability to convert games to high-dynamic-range rendering using machine learning (Auto HDR), support for HDMI 2.1 variable refresh rate and low-latency modes, and updated controllers. Xbox Series X was designed to nominally render games in 2160p (4K resolution) at 60 frames per second (FPS). The lower-end, digital-only Xbox Series S, which has reduced specifications and does not include an optical drive, was designed to nominally render games in 1440p at 60 FPS, with support for 4K upscaling and ray tracing. Xbox Series X/S are backwards-compatible with nearly all Xbox One-compatible games and accessories (including Xbox 360 and original Xbox games that were made backward-compatible with Xbox One); the newer hardware gives games better performance and visuals. At launch, Microsoft encouraged a "soft" transition between generations, similar to PC gaming, offering the "Smart Delivery" framework to allow publishers to provide upgraded versions of Xbox One titles with optimizations for Xbox Series X/S.

Critics praised the Xbox Series X/S for the hardware improvements over the Xbox One and Microsoft's emphasis on cross-generation releases, but believed that the games available at launch did not fully use the hardware capabilities. Xbox Series consoles are estimated to have sold over 28 million units worldwide as of June 2024.

Industry rumors of new Xbox hardware had started as early as June 2018, with Microsoft's Phil Spencer confirming they were "deep into architecturing the next Xbox consoles" at that time. The hardware was believed to be a family of devices under the codename "Scarlett", including a low-cost version following a similar scheme as the Xbox One family of consoles, with major emphasis on game streaming and backward compatibility. By March 2019, further industry rumors had led to speculation of two consoles within the Scarlett family under codenames "Anaconda" and the low-cost "Lockhart" version.

Microsoft confirmed Project Scarlett at its E3 2019 press conference. Microsoft said they wanted a "soft" transition from Xbox One to Scarlett, with Scarlett supporting backward compatibility with all games and most hardware supported on the Xbox One. During a presentation at The Game Awards 2019, Microsoft officially revealed the design of Scarlett and its branding, "Xbox Series X", as well as a late 2020 release date. After the event, a Microsoft spokesperson said Xbox Series X was a fourth generation of Xbox hardware, which will be branded simply "Xbox" with no subtitle.

Microsoft planned to detail the hardware specifications and launch games for the Series X at the 2020 Game Developers Conference (GDC) and E3 2020, but the events were cancelled due to the COVID-19 pandemic. Microsoft scheduled online presentations over the same days in March 2020, while the company planned to reschedule its E3 presentation. Detailed specifications were presented by Microsoft, Digital Foundry, and Austin Evans of Overclock Media on March 16, 2020. Starting in May and running until launch, Microsoft planned to have more digital events around the Xbox Series X and its games as part of an "Xbox 20/20" series. This included an Xbox Games Showcase on July 23, 2020, featuring games principally from its first-party Xbox Game Studios.

On July 16, 2020, Microsoft announced that it had ended production of the Xbox One X and all-digital version of the Xbox One S in preparation for the new products.

The existence of the Xbox Series S had been guessed before E3 2019, based on a "Project Lockhart", a second, lower-end console that accompanied Scarlett. Confirmation of the Xbox Series S naming was affirmed through early Xbox hardware accessories that some had been able to purchase. Microsoft officially announced the Series S console on September 8, 2020, revealing that it would also be released alongside the Series X in November 2020. Microsoft pointed out that the Series S had been discreetly placed in the background of previous Xbox announcement videos featuring Phil Spencer during July 2020.