Anthropic

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.

GitHub OpenAPI
Business capability
AI Model Services AE-110

Operations 4

Each operation below carries the questions people ask an LLM about it and the instructions they give an agent to run it. Generated by API Evangelist overlay

2 of 4 operations are conformant: apis.io called them with no credentials and the responses matched this contract; 2 more answered but could not be checked against a schema. Checked 2026-11-12. how this works · status file

GET /v1/models List available Claude models · List Models conformant #
Ask an LLM
“Which Claude models can I use with my API key right now?”
“What's the newest model available on the API?”
Tell an agent
List the available models.
Show the {limit} most recently released models.
GET /v1/models/{model_id} Look up a model or resolve an alias · Get a Model conformant #
Ask an LLM
“What model ID does a model alias currently point to?”
“Can I get details on one specific Claude model?”
Tell an agent
Get model {model_id}.
Resolve the alias {model_id} to a model ID.
GET /v1/models/{model_id}?beta=true Look up a model via the beta endpoint · Get a Model observed #
Ask an LLM
“Can I resolve a model alias through the ?beta=true models endpoint?”
“Using the beta models route, what details come back for one model?”
Tell an agent
Get model {model_id} via the beta models endpoint.
Resolve alias {model_id} with the ?beta=true lookup.
GET /v1/models?beta=true List models via the beta endpoint · List Models observed #
Ask an LLM
“Which models does the ?beta=true model listing return?”
“Can I list models with beta features enabled?”
Tell an agent
List models via the beta models endpoint.
Page through beta model listings after {after_id}.

Documentation

📖
Documentation
https://docs.anthropic.com/en/api/models-list

Specifications

⚙
OpenAPI
https://artifacts.apis.io/anthropic/openapi/anthropic-models-api-openapi.yml

Schemas & Data

📊
JSONSchema
https://artifacts.apis.io/anthropic/json-schema/anthropic-beta-model-info-schema.json
📊
JSONSchema
https://artifacts.apis.io/anthropic/json-schema/anthropic-model-info-schema.json
📊
JSONSchema
https://artifacts.apis.io/anthropic/json-schema/anthropic-list-response-model-info-schema.json

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OpenAPI Specification

anthropic-models-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Anthropic Models API
servers:
- url: https://api.anthropic.com
tags:


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# Full source: https://artifacts.apis.io/anthropic/openapi/anthropic-models-api-openapi.yml