# Is your AI proxy serving the model you paid for?

Provider switching, model fallback and undisclosed substitution are different things. A model label alone cannot settle the question.

[Canonical HTML page](https://nosecrets.app/en/stories/ai-proxy-model-routing-transparency)

Published by: [No Secrets Research](https://nosecrets.app/en/about#methodology)
Added: 2026-10-20
Topic: Technology

## Scope and context

Applies to: AI gateways · OpenRouter as a documented example
Time context: Documentation checked October 20, 2026
Sources checked: 2026-10-20

This explains documented routing and suggests checks; we have not independently tested or accused a particular reseller of substitution.

## Two kinds of switching

OpenRouter documents provider routing for a chosen model separately from fallback to another model. Provider fallback is enabled by default and can be restricted. Changing the inference provider is therefore not, by itself, evidence that a cheaper model was substituted.

[1: OpenRouter](https://openrouter.ai/docs/guides/routing/provider-selection)

## What a disclosed fallback looks like

Its model-fallback documentation says the response identifies the model ultimately used and that billing follows that model. Our buying checklist: request the model version, permitted fallbacks, actual-model record and corresponding price. Save the seller's promise alongside request IDs and invoices.

[2: OpenRouter](https://openrouter.ai/docs/guides/routing/model-fallbacks)

## A weak answer is a lead, not proof

Our assessment: neither a model's self-introduction nor a proxy-controlled response field is independent authentication. Compare repeatable tasks under matched settings and retain records, but treat discrepancies as grounds to investigate. A fraud claim needs evidence connecting the advertised promise to the actual service.

[1: OpenRouter](https://openrouter.ai/docs/guides/routing/provider-selection) · [2: OpenRouter](https://openrouter.ai/docs/guides/routing/model-fallbacks)

## Sources

1. [Provider Routing](https://openrouter.ai/docs/guides/routing/provider-selection) — OpenRouter. . Provider routing controls; a documented service example, not an accusation.

2. [Model Fallbacks](https://openrouter.ai/docs/guides/routing/model-fallbacks) — OpenRouter. . Distinguishes model fallback and billing for the model actually used.

## Disclosure

AI-assisted research, writing and translation by No Secrets, using the linked public documents. This is a source summary, not firsthand reporting or an independently audited investigation. No affiliate links are used in this article.

The source-check date is not the event date. Original documents control if a summary differs.