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LM Studio Anthropic Compatibility API

Anthropic-compatible messages endpoint.

LM Studio Anthropic Compatibility API is one of 4 APIs that LM Studio publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Anthropic Compatibility. The published artifact set on APIs.io includes an OpenAPI specification and authentication docs.

This API exposes 1 operation across 1 path, and defines 1 schema. It is described by OpenAPI 3.1.0, at version 1.0.0-beta.

Requests are made against a single base URL, http://localhost:1234.

1 operations 1 paths 1 schemas 1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
1.0.0-beta
Base URL
http://localhost:1234
Authentication
HTTP Bearer
Contact
Resource Areas
1

Authentication & Security 1

LM Studio Anthropic Compatibility API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (ApiToken).

  • ApiToken — Optional API token. The native /api/v1 server can be configured to require a bearer token; by default the local server accepts unauthenticated requests from th…

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.

Anthropic Compatibility 1

Anthropic-compatible messages endpoint.

POST
/v1/messages
Create a message (Anthropic-compatible)
anthropicMessages body → 200

Schemas 1

The contract defines 1 schema that model the data the API accepts and returns. The most detailed is Message (2 properties). Each schema is shown below with its type and property counts.

Message
object
2 properties 2 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

lm-studio-anthropic-compatibility-api-openapi.yml Raw ↑

Other APIs LM Studio publishes across the network.

LM Studio Chat API
LM Studio Models API
LM Studio OpenAI Compatibility API
Where this information came from

This is an independent, third-party profile of LM Studio Anthropic Compatibility API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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