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For decisions that must remain responsive through network delays or outages, run time-critical inference on the device or a nearby edge system, and use cloud infrastructure for training, centralized management, heavier processing, and longer-term analysis. The best placement depends on the complete decision path—not just where the model runs.

What is the difference between edge AI and cloud AI?

Edge AI runs inference on or near the device or data source. That may mean a model running on a sensor-equipped device, a gateway serving several devices, or edge nodes connected to a regional cloud. Cloud AI runs inference in centralized cloud data centers.

These are choices about where computation happens, not competing approaches to every part of an AI system. A common hybrid design trains and versions models centrally, deploys them locally for time-sensitive inference, and sends selected events or summaries to the cloud for monitoring and further analysis. The cloud can support the system without being involved in every immediate decision.

How to choose where real-time inference should run

Start with the full latency budget

Local inference can avoid a round trip to a remote service, but that does not automatically make the whole application fast. Preprocessing, model size, local compute, communication among components, and the steps that follow inference all contribute to response time. A nearby network-edge location may be sufficient for some workloads.

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Set a response-time target for the complete decision path, then measure it on representative hardware and under realistic network conditions. Benchmarking only the model’s inference time can miss delays elsewhere in the system. Google Cloud’s real-time inference infrastructure guidance treats infrastructure selection as specific to the workload.

Decide what must happen when connectivity fails

A cloud-only inference path depends on a working connection to the cloud. An application can continue making local decisions during an interruption if the model and decision logic are available at the device or site and the application is designed to operate there.

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Plan how the system behaves while offline: what it can decide locally, what data it buffers, how it synchronizes after reconnection, and what happens when it cannot safely make a decision. Those choices are part of the architecture, not details to leave until deployment.

Match model and compute needs to the target hardware

Cloud infrastructure offers pooled compute and centralized services. Edge hardware varies widely, and a model that works on one platform may not meet the latency or throughput target on another. Test the actual workload on representative target hardware before choosing where to run it.

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NVIDIA publishes Jetson inference benchmarks, but their results apply to the hardware and software configurations described in each benchmark. They should not be generalized to other configurations or compared with cloud results unless the measurements use aligned workloads and conditions. Google Cloud likewise frames infrastructure choice as workload-specific in its real-time inference guidance.

Account for data movement and privacy obligations

Processing data locally can reduce the amount of raw information sent over a network and keep it closer to its source. That can be useful when bandwidth is constrained or data handling requires care, but local processing alone does not ensure security or regulatory compliance. Review the full data flow, access controls, retention, residency, and applicable rules.

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Compare operating effort and total cost

A distributed edge fleet needs deployment, updates, monitoring, and device lifecycle management. Cloud inference relies on remote services and network transfer instead. Compare the total operating cost of the actual deployment—including the infrastructure and ongoing operational work—rather than assuming that lower network latency means lower cost. There is no workload-specific cost comparison established here that makes one placement universally cheaper.

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Which inference architecture fits your use case?

Placement Best fit Main trade-off
On-device Decisions must happen at the data source, connectivity is unreliable, or sending raw inputs is undesirable. Model capability and performance are limited by the device’s compute and other hardware constraints.
Gateway or site Several local devices can share nearby compute, or an individual device cannot host the desired workload. Adds a local network hop, though it can avoid a round trip to a distant cloud.
Network edge A service needs to be closer to users or mobile devices but does not need to run on each device. Latency depends on the specific infrastructure and end-to-end system. AWS describes Local Zones and Wavelength for particular latency-sensitive workloads; its performance statements are service-specific, not guarantees for every application.
Central cloud The workload benefits from centralized compute and services, and its network path meets the application’s timing and availability requirements. The inference path depends on connectivity to the cloud. Cloud infrastructure can still support training, orchestration, model versioning, and heavier processing in a hybrid design.

AWS says its Local Zones support “single-digit millisecond latency” for listed use cases. Treat that as AWS’s claim about its described infrastructure and use cases, not as a general result for all cloud systems or a direct comparison with edge inference. See AWS Local Zones for the service description.

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When a hybrid edge-and-cloud design makes sense

Use a hybrid design when an immediate decision must be made locally, but the system also benefits from centralized model development and management. The local component can infer from nearby data; the cloud can train and version models, coordinate deployment, and analyze selected events or summaries. Decide explicitly what information is sent upstream and how local devices behave if they lose contact with cloud services.

AWS describes this pattern in its AWS IoT Greengrass machine-learning inference documentation: “With AWS IoT Greengrass, you can perform machine learning (ML) inference on your edge devices on locally generated data using cloud-trained models.” This is a description of product capability, not independent comparative performance testing.

How to evaluate a prototype

If you need to prototype local inference, an NVIDIA Jetson Orin development kit is one possible hardware path. NVIDIA’s Jetson Orin documentation describes variants and edge AI application workflows. Select hardware against your own model, sensors, throughput, power, thermal limits, and latency target; no single kit is established as suitable for every production workload.

  1. Define the decision’s response-time target and availability requirements.
  2. Map the complete path from input capture through preprocessing, inference, and the resulting action.
  3. Test the workload on representative device, gateway, network-edge, or cloud infrastructure, including realistic network delays and interruptions.
  4. Measure data transferred, buffering and recovery behavior, operational requirements, and total deployment cost alongside response time.
  5. Choose the least complex placement that meets the application’s requirements, and retain a hybrid path where local response and centralized services are both useful.

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