An abstraction layer hides selected differences behind a stable contract. For AI services, it can normalize requests, authentication, model names, tool formats, streaming, errors, usage records, and responses across multiple providers.
The layer can make switching easier, but it cannot erase every provider difference. Features, semantics, safety behavior, context limits, pricing, and output quality still require explicit testing rather than assuming complete interchangeability.
ELI5
An abstraction layer gives software one simpler interface over several changing models or infrastructure services. Applications use the stable layer instead of depending on every provider's separate details.
For example, an app can send the same request format to a local model or a hosted model through one routing layer. The layer should still expose important errors, costs, limits, and controls rather than hiding information needed for safe operation.
