Microsoft Cobalt 100
Chip
CPU
Shipping
Azure's 128-core Arm CPU for the cloud around the AI.
You're looking at a chip record: what this processor is, its key specs, who designs, manufactures and supplies its parts, and where it gets used.
Cobalt 100 is Microsoft's Neoverse-based server CPU, launched alongside Maia to cover the general-purpose side of Azure. Its significance is strategic: all four US hyperscalers now design their own server CPUs.
Specifications & key facts
Each figure is labeled by basis: vendor spec, vendor claim, reported, estimate, or official. "Not publicly disclosed" means exactly that — we never invent values.
Overview
Designer
Microsoft
Cores
128 × Armv9Vendor spec
Announced
November 2023; GA 2024
How this connects to the rest of the stack
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Designed by
Available from
Based on
Sources
Microsoft custom silicon overview ↗
Record reviewed as of 2026-01-15 — see Methodology.