AISelect Overpay Index

The same AI model typically costs 2.7× as much at the most expensive provider

For a typical LLM that 5 or more providers sell, the most expensive provider charges 2.7× what the cheapest one does, for the same model. That is the median across 55 models, recalculated every day from standard list prices.

Standard list prices from the providers we track, blended 3 input : 1 output tokens, without discounts. Definition · Methodology · data under the MIT License on open data.

How wide the gaps are

Number of models by the ratio of their most expensive to their cheapest provider.

under 1.5×
20
1.5 to 2×
3
2 to 3×
5
3 to 5×
6
5 to 10×
14
10× or more
7

The 10 widest gaps today

Same model name, but providers can differ in quantization, context length and rate limits. Wide gaps are often worth a test, not a blind switch.

Index over time

Oct 18, 2026: 3.28× over 64 modelsOct 19, 2026: 3.24× over 63 modelsOct 20, 2026: 3.12× over 64 modelsOct 21, 2026: 3.12× over 64 modelsOct 22, 2026: 3.12× over 64 modelsOct 23, 2026: 3.12× over 64 modelsOct 24, 2026: 3.12× over 64 modelsOct 25, 2026: 3.12× over 64 modelsOct 26, 2026: 3.12× over 62 modelsOct 27, 2026: 2.66× over 56 modelsOct 28, 2026: 2.66× over 56 modelsOct 31, 2026: 2.7× over 55 modelsOct 18, 2026Oct 31, 2026

Definition and how to cite it

For every LLM that at least 5 providers we track sell, we divide its highest blended list price (3 input : 1 output tokens per 1M) by its lowest. The index is the median of those ratios, so a few extreme models cannot move it; within each model, though, one provider sets the cheapest and one the most expensive price. Models with fewer providers, or with a free (zero) listing, are left out. List prices only: no cache, batch or volume discounts. The definition does not change; if it ever has to, the old series stays as it was.

Free to quote and chart with a link. Copy:

AISelect Overpay Index: 2.7× (Oct 31, 2026). Median ratio of the highest to the lowest list price for the same LLM across 55 models sold by 5+ providers. Source: https://aiselect.online/overpay-index

Act on it

Paying the expensive end?

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