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Largest machine on a public cloudUse it today
The largest gate-based quantum computer that anyone can use today through a public cloud service. Higher is better.
Why it matters
For businesses, this is the practical question: what can we actually try right now?
Keep in mind
Availability comes from QubitBenchmark's records, with the date it was checked. Cloud access, pricing and queue times vary.
The measure
This month's ranking
All 3 eligible machines.
| # | Move | Machine | Result | Grade |
|---|---|---|---|---|
| 1 | · not ranked last month | Nighthawk r2IBM | 120 qubits | B |
| 2 | · not ranked last month | HeliosQuantinuum | 98 qubits | B |
| 3 | · not ranked last month | H2Quantinuum | 56 qubits | B |
Compared within one method, as grouped by QubitBenchmark: physical-qubit-count@gate-based. This is the first ranking, so movement shows from next month. Equal results share a place.
Where each machine's availability comes from: Nighthawk r2: source, checked 28 October 2026 (On IBM Quantum Platform as ibm_phoenix (us-east, online); IBM dates the Nighthawk r2 revision to September 2026.). Helios: source, checked 28 October 2026 (On Quantinuum's cloud and also sold on-premises as Hardware-as-a-Service; Quantinuum lists it as available since 5 Nov 2025.). H2: source, checked 15 May 2026 (On Azure Quantum (H2-1 and H2-2) and Quantinuum's own cloud, where Quantinuum lists System Model H2 as available.).