Key generated alongside an Azure OpenAI or Foundry Tools resource and supplied through the api-key header. It is used only when keyless authentication with Microsoft Entra ID cannot be.
Also called resource key.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains API key (Foundry resource key) in context, with comparison tables and the common traps.
Terms in this definition
- Index field attributes
Settings applied to each field in an Azure AI Search index:
searchablefor full text,retrievableto return it,filterablefor exact-match$filter,sortable,facetablefor counts, andkeyfor the unique document ID. - Azure OpenAI
Use of OpenAI models in Azure, including GPT, o-series, embeddings, image and Whisper, through either a Foundry resource or an Azure OpenAI resource. Content Understanding isn't available from a standalone Azure OpenAI resource.
- Foundry Tools
Microsoft's collection of AI APIs that can be used ready-made or customised, spanning areas such as Vision, Speech, Language, Document Intelligence, Content Safety and Content Understanding.
- Keyless authentication
Recommended way of calling AI services and models: rather than sending an API key, the caller presents a Microsoft Entra ID token and is authorised through an RBAC role.
- Microsoft Entra ID
Cloud identity service from Microsoft, previously named Azure AD, which provides the tenant behind Microsoft 365 and Azure.
Related terms
- APIM subscription key
Caller key supplied either as a query-string parameter or in the Ocp-Apim-Subscription-Key header. API Management's gateway checks it as an APIM subscription key, which is not a Microsoft Entra token, while Foundry Tools like Content Safety read the resource key from it.