Anthropic Models API
List and inspect Claude models including Opus 4.7, Sonnet 4.6, and Haiku 4.5. The response includes max_input_tokens, max_tokens, and a capabilities object for every model so clients can discover model properties programmatically.
Anthropic Models API is one of 24 APIs that Anthropic publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include AI, Artificial Intelligence, and Models. The published artifact set on APIs.io includes API documentation and an OpenAPI specification.
This API exposes 2 operations across 2 paths, and defines 3 schemas. It is described by OpenAPI 3.1.0, at version 1.0.0.
Requests are made against a single base URL, https://api.anthropic.com/v1.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 1
Anthropic Models API declares
1 security scheme
for authenticating requests.
An API key is passed in the header as x-api-key (AdminApiKeyAuth).
By default, every request must be authenticated.
AdminApiKeyAuth— Your Admin API key for authentication (starts with sk-ant-admin...).
Paths & Operations 2
Across 2 paths, the API surfaces 2 operations — 2 GET. Each is listed below with its method, path, parameters, and response codes.
APIs for listing and retrieving model information
Schemas 3
The contract defines 3 schemas that model the data the API accepts and returns. The most detailed are ModelInfo (4 properties), ListModelsResponse (4 properties), ErrorResponse (2 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from Anthropic 12
Other APIs Anthropic publishes across the network.
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