Free tool
AI Subscription vs API Calculator
A flat $20/mo plan or pay-per-token API access — which is actually cheaper for how *you* use AI? Enter your usage to see the monthly cost both ways and the exact break-even point.
The API is cheaper for you — by about $15.05/mo.
Break-even is ~2,424messages a month at this size. Below that the flat subscription wins; above it, metered API access is cheaper — and the API scales to zero when you don't use it. Remember the subscription also buys the polished app, image tools, and "unlimited" fair-use chatting; the API is raw access you build on.
Sizing real API spend across models?
Approximate public list prices ($/1M tokens); subscription price is whatever you enter. Directional — confirm current pricing with each provider.
Frequently asked
Is ChatGPT Plus (or Claude Pro) worth it, or should I use the API?
It comes down to how much you use it. A flat ~$20/mo plan is effectively unlimited fair-use chatting, so if you chat a lot it's a bargain. The API bills per token, so light or bursty usage is often far cheaper — and it scales to $0 when idle. Enter your messages-per-day and typical prompt size above and the tool shows the monthly cost both ways plus the break-even point.
What's the break-even between a subscription and the API?
It's the number of messages per month at which the API's metered cost equals the flat subscription price. Below that, the subscription is cheaper; above it, the API is. The break-even moves with your prompt and reply size — bigger prompts and longer answers cost more per message on the API, lowering the message count at which the subscription wins. The calculator computes it live for your numbers and chosen model.
Is it apples-to-apples? What does a subscription include that the API doesn't?
Not quite — they're different products. A consumer subscription includes the polished app, image generation, voice, file uploads, and a ready-made interface, with 'unlimited' fair-use messaging. The API is raw model access: cheaper per token and fully programmable, but you build (or buy) the interface yourself and there's no bundled app. Use this tool for the pure cost comparison, then weigh the convenience the subscription bundles in.
Which is cheaper for a team or a product?
For an internal team of heavy chat users, per-seat subscriptions are usually simplest and predictable. For a product or feature you're shipping to your own users, the API almost always wins on cost and is the only real option (you can't resell a consumer subscription). If you're building something, size it with the AI API Cost Calculator and the AI Agent Cost Calculator instead.