5 companies
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Providers renting accelerated compute, from bare-metal clusters to per-second serverless GPUs. These are the specialists. The hyperscalers have their own category, and several companies here also appear under fine-tuning platforms because they sell managed layers on top of their own hardware.
Start with availability of the specific accelerator you need. Then contract shape, whether spot, on-demand or reserved, interconnect quality for multi-node training, and storage locality. Advertised hourly rates mean nothing until egress, storage and minimum commitments are folded in.