Credits, tokens and subscriptions describe different aspects of an AI service's billing, but providers do not use the words consistently. A subscription usually concerns recurring access or allowances. Credits often represent an internal balance. Tokens can refer either to a provider-defined billing unit or, in language-model contexts, units used to represent text.
The label is not enough to compare two offers. Read the explanation of what each unit buys, when it is deducted and whether it expires. For the technical meaning in one language-model system, Google's token documentation describes tokens as units used to represent model inputs and outputs. A consumer app's internal balance need not follow the same definition.
Access and usage can be sold separately
A plan can charge for account access while also limiting certain actions through a balance. Another service might sell only prepaid usage. A third could combine a subscription allowance with optional top-ups.
These are hypothetical arrangements, not verified descriptions of any particular application. Before paying, identify which arrangement applies to your offer. Our guide to subscription costs explains why the checkout amount and the included allowance should be recorded separately.
If the pricing page says only that a plan includes “tokens”, look for the unit's definition. Do not assume that it equals one completed task, one message or a fixed amount of text across services.
Compare like units with like units
Consider a fictional package containing 120 credits for $12. If a specified action costs six credits, the package covers 20 such actions and the credit cost per action is $0.60. That arithmetic assumes the rate stays fixed and excludes subscriptions, taxes, expiry and any unsuccessful attempts that also consume credits.
Another package advertising 1,000 tokens could be more or less expensive for the same purpose. Without knowing the deduction rate and conditions, the larger number does not establish better value.
Also distinguish the cost of initiating a task from the cost of obtaining a usable result. If you are evaluating a product's reliability, use evidence rather than assuming every paid attempt succeeds.
Check what happens to unused balances
Look for expiry dates, monthly resets, rollover rules and any distinction between purchased and promotional units. A balance shown today may not remain available indefinitely. Conversely, do not assume expiry where the provider has not stated it; clarify the rule.
Ask what happens when a subscription ends. Continued access to purchased units, loss of a promotional allowance and refund eligibility are separate issues. A positive balance is not automatically money that can be withdrawn to a bank account.
Look for automatic purchases
A top-up can be a one-off purchase or an automatically triggered charge, depending on the arrangement. Check whether you are enabling recurring replenishment when the balance reaches a threshold, and how that setting can be disabled.
This differs from a subscription renewing on a calendar date. If both mechanisms exist, cancelling one may not address the other. Keep confirmation of the specific action you take; see documenting cancellation.
Keep terminology separate from promises
Terms such as “unlimited” may still be accompanied by conditions or restrictions. Read the description rather than assuming the absence of limits. Where a unit or condition remains undefined, request clarification before entering payment details.
For an introductory balance, read free trials and automatic renewals as well. A complimentary allowance and a trial that later becomes a paid subscription are not necessarily the same offer.
The useful comparison is the cost and conditions of the activity you actually need. A large balance number on its own is not a purchasing decision.
Related reading
AI Subscription Costs: What to Check Before Paying
