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There is no universal cheaper option. Cloud APIs generally avoid the cost of buying inference hardware and charge according to the model and how much you use it. Running models locally adds hardware, electricity, setup, and upkeep costs—but can be economical if you already own capable hardware or keep new equipment busy. The fair comparison is the cost of producing the same useful work at comparable quality, not simply an API’s token rate against a GPU’s hourly price.

What you are paying for

Cloud API costs

API charges depend on the selected model and the number of input and output tokens. Providers may also price batch processing, caching, priority or other service modes differently, and tools or other features can add charges. Check the provider’s live model-specific pricing and effective dates rather than treating one rate as representative of all cloud AI.

For a basic estimate, calculate input tokens multiplied by the input-token rate, plus output tokens multiplied by the output-token rate. Then account separately for discounts, cached tokens, tool use, and any other applicable charges. Google’s Gemini Developer API pricing page lists rates and options by model and mode, including free and paid tiers and scheduled price changes. At the schedule displayed in the result accessed October 7, 2026, Gemini 3 Flash Preview was listed at $0.50 per million input tokens and $3 per million output tokens; verify the live table and effective date before using those figures.

Anthropic says its Batch API discounts both input and output tokens by 50%. The actual rate remains model-specific, so check Claude Platform pricing for the current schedule.

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Local inference costs

A local model may have no per-token invoice, but the hardware is not free. Include the purchase price, a realistic useful life, electricity, any cooling or hosting, setup, and maintenance. Spread the hardware cost over the work it actually performs—not an assumed maximum capacity it rarely reaches.

If you already own a capable computer, distinguish its marginal running cost from its fully loaded cost. Marginal cost focuses on extra electricity and other costs incurred by running inference; fully loaded cost also allocates an appropriate share of the machine’s purchase price and upkeep. Showing both makes clear whether a result depends on treating existing hardware as free.

How to compare the costs fairly

  1. Define the workload. Match the broad task, expected quality, context length, and output volume. Comparing a small local model with a more capable cloud model is not an apples-to-apples price comparison if they do not produce similarly useful results.
  2. Estimate API charges. Multiply input and output token volumes by the chosen model’s current rates. Add any applicable batch, caching, tool, mode, or other charges.
  3. Calculate the local system’s full cost. Allocate hardware purchase cost across its realistic useful life and actual workload. Add electricity and any cooling, hosting, setup, or maintenance expenses.
  4. State utilization and operating assumptions. Record how often the hardware will be used, the throughput it can sustain on the intended workload, and the relevant electricity or hosting prices.
  5. Compare useful output. Consider whether each option meets the required quality and capability, then compare the cost of delivering that workload—not just cost per hour or per token.

The break-even point depends on the workload, token mix, model choice, acceptable quality, hardware, utilization, and energy or hosting prices. Without those assumptions, a single monthly bill or universal break-even token count would be misleading.

Why a GPU’s hourly cost is not enough

Hourly expense does not tell you how many useful tokens a system delivers in that hour. Throughput, model size, workload, and output quality all affect the cost of completing a task. A slower system can have low electricity costs yet take so long that its cost per useful result is higher.

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NVIDIA frames the hourly cost differently depending on deployment: “For cloud deployments, this is the hourly rate paid to a cloud provider; for on-premise deployments, it’s the effective hourly cost derived from amortizing owned infrastructure.” Its current comparison reports $4.20 per million tokens for an H200-based Hopper system and $0.12 per million for a GB300 NVL72 Blackwell system, using assumed hourly GPU costs of $1.41 and $2.65 respectively. These are NVIDIA’s configuration- and workload-specific figures, not a general estimate for local inference or a direct comparison with API prices. Its analysis also emphasizes throughput as a key factor in token cost.

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What large-server estimates can—and cannot—tell you

OECD’s 2026 discussion of H100 infrastructure offers an example of why electricity and hosting assumptions matter, but it is not a consumer-PC estimate. Its scenario assumes one H100 uses about 700 W at full capacity, with up to another 700 W for cooling, RAM, and CPU; average European electricity at about USD 0.25/kWh; a power usage effectiveness (PUE) of about 1.3; and colocation at approximately USD 1,200 per H100 GPU per month. Under those assumptions, it estimates electricity at about USD 300 monthly per H100. These are scenario assumptions, not universal household costs or current provider quotes.

Cost is only one part of the decision

  • Capability and quality: A small locally runnable open-weight model may not match a chosen cloud model’s quality or support for different modalities.
  • Latency and throughput: Consider how quickly the system responds and how much work it can sustain, especially during busy periods.
  • Memory and hardware: The model and workload determine what local hardware can run effectively.
  • Privacy and data handling: Local operation changes where processing occurs, but it does not guarantee privacy. Data handling depends on the complete setup.
  • Availability and effort: Offline access, uptime, and the time required to maintain hardware and inference software may matter as much as the bill.

Does local AI use less energy?

There is no universal energy figure that settles the local-versus-cloud comparison. Google Cloud reported a median Gemini Apps text prompt energy use of 0.24 Wh, with 0.03 gCO₂e and 0.26 mL of water, in an August 21, 2025 post. The same post gives an accelerator-only estimate of 0.10 Wh, 0.02 gCO₂e, and 0.12 mL, while warning that this narrower estimate “is an optimistic scenario at best and substantially underestimates the real operational footprint of AI.” Those figures describe Google’s Gemini Apps prompts and methodology; they are not universal API measurements or benchmarks for local models.

For your own comparison, use the energy consumed by the local system while completing the matched workload, and state the assumptions behind the estimate. Do not infer local energy use from a GPU’s rated power alone: workload duration and the rest of the system also matter.

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