| How you pay | Per token, per hour or per user, monthly | Hardware bought, financed or leased, plus rack space and power | Hardware bought, financed or leased; your own power and cooling | A private base plus metered cloud for peaks |
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| Best when | Trying ideas, spiky or short workloads | Steady AI use and you lack a suitable server room | Steady use, strict data rules and a site with power and cooling | Steady base load with occasional big peaks |
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| Where data lives | The provider's regions | A UK data centre you choose | Your own building, can be air-gapped | Sensitive data private, the rest where it's cheapest |
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| Time to start | Minutes | Weeks to months: hardware lead times and installation | Weeks to months, longer if the site needs power or cooling work | Start in the cloud, move steady work in as hardware arrives |
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| Cost as usage grows | Rises with every user and every call | Flat until you need more GPUs | Flat until you need more GPUs | Flat base, metered peaks |
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| Latency to your systems | Over the internet or a private link | Low, with a private connection to your sites | Lowest, on your own network | Low for private workloads |
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| Model and tool choice | The provider's catalogue and limits | Anything you can run | Anything you can run | Both |
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| Skills needed | Cloud and application skills | Platform and GPU operations, or a managed service | Platform, GPU and facilities operations, or a managed service | Both, plus workload placement |
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| GPU availability | Newest GPUs often sold out or rationed | Guaranteed once installed | Guaranteed once installed | Guaranteed base, best-effort peaks |
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| Hardware refresh | The provider's choice | Your choice, every 3 to 5 years; older GPUs move to lighter work | Your choice, every 3 to 5 years | Your choice for the base |
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