JUPITER exascale supercomputer

What it is

JUPITER is a supercomputer at the Jülich Supercomputing Centre in North Rhine-Westphalia, inaugurated on 5 September 2025. It is owned by the EuroHPC Joint Undertaking, which funds half; the other half comes in equal parts from Germany's federal research ministry and the NRW science ministry, 500 million euros in total. It was built by a consortium of ParTec and Eviden.

How it works

JUPITER is modular. The Booster holds about 6,000 nodes with around 24,000 NVIDIA GH200 Grace Hopper superchips in 125 racks on Eviden's BullSequana XH3000 platform, for highly parallel work and AI. A Cluster module of more than 1,300 nodes uses the Rhea processor from the European chip designer SiPearl for general tasks. The two can run jobs separately or together. The machine sits in roughly 50 container modules covering more than 2,300 square metres, and is cooled with warm water whose waste heat is meant to feed the campus heating network.

Why it stands out

On the November 2025 TOP500 list JUPITER reached 1.000 exaflop per second, a billion billion calculations each second, placing fourth worldwide and making it the first exascale system outside the US. For AI workloads at 8 bit precision it offers up to about 80 exaflops with sparsity. Its development module JEDI ranked first on the Green500 list of energy efficient computers.

Where you meet it

Indirectly, in sharper climate and weather models, materials and drug research, energy system planning and European language models. Start-ups and smaller firms can apply for time through the JUPITER AI Factory and EuroHPC calls.

Access is open to researchers across Europe through EuroHPC calls, with allocation managed jointly by EuroHPC and the Gauss Centre for Supercomputing. More than 30 early access projects tested the system before public rollout.

Sources

• EuroHPC JU: JUPITER launching Europe's exascale era
• Forschungszentrum Jülich: JUPITER
• TOP500: November 2025 list