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Local AI vs API vs subscription: what is actually cheaper?
Local AI can compete with API and subscription pricing, but it is not free. This calculator includes hardware amortization, electricity, idle power, and admin time so you can compare the real monthly cost.
Comparing against 123 API models. Data updated .
Local wins when
The workload is steady, the model fits your hardware, and privacy or latency matters enough to justify ownership.
APIs win when
You need frontier quality, burst scaling, many model choices, or production reliability without maintaining GPUs.
Subscriptions win when
One person uses a provider app heavily and wants a simple monthly budget instead of token math.
ChatGPT Plus
GPT-5.4 mini
Local hardware
Usage
Monthly volume: 9,000 requests, 13,500,000 input tokens, 6,300,000 output tokens.
Local hardware assumptions
Subscription and admin assumptions
Break-even point
Against GPT-5.4 mini, local hardware breaks even at about 973 requests per day with the current token assumptions.
This compares cost only. It does not model quality gaps, context window limits, GPU memory limits, throughput tuning, or provider-specific features.
| Daily requests | Monthly tokens | API cost | Local cost / 1M | Likely winner |
|---|---|---|---|---|
| 50 | 3,300,000 | $6.41 | $37.80 | API |
| 300 | 19,800,000 | $38.47 | $6.30 | Subscription |
| 1,000 | 66,000,000 | $128.25 | $1.89 | Subscription |
| 3,000 | 198,000,000 | $384.75 | $0.6301 | Subscription |
How this calculator works
Local monthly cost is the sum of hardware amortization, electricity, and the value of maintenance time. API monthly cost uses the same token pricing formula as our other AI cost calculators. Subscription cost is a flat baseline so you can see when simple monthly plans still beat both API and local hardware.
Formula
local monthly cost = hardware price / amortization months + electricity + admin time
API monthly cost = input tokens / 1,000,000 * input price + output tokens / 1,000,000 * output price
What this does not include
The calculator is cost math, not a quality benchmark. It does not measure model quality, context length, GPU memory limits, quantization loss, throughput tuning, uptime, or the value of provider product features such as file upload, voice, deep research, or coding tools.
Best next reads
For raw token math, start with How to Calculate AI API Costs. For flat monthly plans, use the Subscription vs API calculator. For the cheapest metered options, read Cheapest AI APIs Ranked.