What do you guess will be the leading CPU architecture in 2028? Please limit yourself to desktop / server candidates. Feel free to speculate, if you wish, though of course this is a debate so speculation will probably be challenged by the other participants.

Grok 4.1 Fast

Vote: x86_64

x86_64 currently dominates desktop and server markets with over 95% share, driven by Intel and AMD's massive ecosystems, software compatibility, and backward compatibility that enterprises demand. ARM (a RISC variant) is growing in servers via AWS Graviton and hyperscalers for efficiency, but it starts from a tiny base and lacks broad desktop adoption outside Apple. Full ecosystem parity by 2028 is unlikely given Windows/x86 lock-in. 'Something new' is improbable; new architectures like RISC-V are nascent, with no signs of overtaking established players in just four years amid trillion-dollar investments in x86.

GPT-5.4

Vote: x86_64

x86_64 is still the most likely leading desktop/server architecture in 2028 because installed base, software compatibility, and vendor inertia matter more than technical elegance on this timescale. In servers, hyperscalers are expanding ARM, but broad enterprise deployment still heavily favors x86_64. The ecosystem for virtualization, commercial software, management tools, and operational expertise remains deepest there. On desktops, Windows and PC gaming are especially important. Even if ARM gains share, the center of gravity for performance desktops, workstations, and mainstream business PCs is still likely to be x86_64 by 2028. AMD and Intel also have strong roadmaps and can keep absorbing good ideas without changing ISA. If the question is "leading" rather than "fastest growing," x86_64 is the safest bet. RISC-based challengers, especially ARM, will be much stronger by 2028. But overtaking x86_64 across desktop/server combined is a higher bar than becoming strategically important.

Gemini 3.1 Pro

Vote: x86_64

My vote is A: x86_64. While ARM (a RISC-based architecture) is making undeniable strides with Apple Silicon, Qualcomm's Snapdragon X Elite, and cloud-native server chips like AWS Graviton, the sheer momentum and inertia of x86_64 cannot be entirely overcome by 2028. First, software compatibility remains a massive moat. The vast majority of legacy enterprise software, PC games, and on-premise server workloads are compiled exclusively for x86_64. Emulation layers like Rosetta 2 or Prism are impressive, but native execution is always preferred for mission-critical or high-performance tasks. Transitioning a global ecosystem takes decades, not a few years. Second, enterprise hardware refresh cycles are slow. Even if ARM were to achieve absolute performance and efficiency dominance today, it would take multiple 3-to-5-year hardware replacement cycles for global fleets to reflect that shift. By 2028, a large portion of existing x86_64 machines will still be in active service. Finally, Intel and AMD are actively adapting. They are already implementing hybrid core architectures (like Intel's P-cores and E-cores) and heavily prioritizing power efficiency to counter ARM's traditional advantages. Because of this aggressive counter-strategy combined with immense legacy lock-in, x86_64 will retain the absolute market share lead in desktop and server environments in 2028.

Kimi K2.5

Vote: x86_64

Four years is simply too short a timeframe to unseat x86_64's entrenched dominance in the desktop and server markets. Despite Arm's impressive gains in cloud servers and Apple's desktop migration, the x86 ecosystem retains overwhelming path dependency: billions of lines of legacy enterprise code, proprietary Windows applications, and decades of toolchain optimization create switching costs that extend hardware refresh cycles to 5–7 years or longer. By 2028, most Fortune 500 datacenters will still be running the x86_64 infrastructure they deployed in 2023–2024. Intel and AMD are also not passive incumbents. Their shift to chiplet architectures, 3D stacking, and hybrid big.LITTLE-style designs (P-cores/E-cores) directly addresses the efficiency criticisms that drove Arm adoption. By 2028, process node advantages will have narrowed, removing the primary performance-per-watt gap that favored RISC alternatives. Finally, "leading" implies volume and economic dominance, not just growth rate. Even if Arm captures 30–40% of the server market by 2028—a bullish scenario—x86_64 will still power the majority of workstations, gaming PCs, and legacy on-premise servers. The architecture will remain the default target for compilers, virtualization layers, and commercial software distribution, cementing its position as the de facto standard.

Claude Opus 4.6

Vote: x86_64

x86_64 will remain the leading CPU architecture in desktop and server markets through 2028, for several compelling reasons. First, the installed base and ecosystem inertia are enormous. The vast majority of enterprise software, operating systems, development toolchains, and cloud infrastructure is built around x86_64. Migrating workloads is costly and slow — even AWS, which has been aggressively pushing Graviton (ARM) since 2018, still runs the majority of its instances on x86_64. Three years is simply not enough time for a wholesale shift. Second, x86_64 is not standing still. AMD's Zen 5 and Intel's upcoming architectures continue to deliver competitive performance and efficiency improvements. Intel's disaggregated tile approach and AMD's chiplet strategy show that x86_64 still has significant headroom for innovation without requiring customers to abandon their software stacks. Third, while ARM (the most plausible RISC challenger) has made impressive inroads — Apple Silicon on desktop, Graviton/Ampere in the cloud — its server market share is still estimated at roughly 10-15%. Even with aggressive growth, overtaking x86_64 by 2028 would require an unprecedented pace of adoption. Most enterprise customers are conservative and require years of validation before switching architectures. Fourth, RISC-V, while promising, is even further behind. It lacks the mature server-grade ecosystem needed to compete at scale in the desktop/server space by 2028. It's making progress in embedded and edge computing, but high-performance server chips are years away from being competitive. Finally, option C — something entirely new — is extremely unlikely in a 3-year timeframe. Novel architectures take decades to go from concept to market dominance. The most realistic prediction is that x86_64 retains its leading position in 2028, even as ARM continues to grow its share.

Final Summary

The AI Roundtable reached a swift and unanimous consensus, favoring the continued dominance of x86_64 despite the growing momentum of RISC-based competitors. Claude Opus 4.6 and Gemini 3.1 Pro highlighted that the sheer weight of legacy enterprise software and glacial hardware refresh cycles create a moat too wide to cross in just four years. While acknowledging ARM's rise, GPT-5.4 and Kimi K2.5 argued that 'leading' is a matter of volume and ecosystem inertia, where Intel and AMD's active adaptation currently leaves challengers fighting for percentages rather than the throne.

All 5 models agreed on "x86_64" after discussion

Strongest Arguments

• x86_64: Software compatibility and enterprise inertia matter more than technical elegance on a four-year timescale; transitioning a global ecosystem takes decades, and x86_64 is not a static target—it's actively absorbing the efficiency advantages of its rivals.