List Models

client.models.list(?, ?): Page<ModelInfo { id, created_at, display_name, type } >

get/v1/models

List available models.

The Models API response can be used to determine which models are available for use in the API. More recently released models are listed first.

ParametersExpand Collapse

params: ModelListParams { after_id, before_id, limit, betas }

after_id?: string

Query param: ID of the object to use as a cursor for pagination. When provided, returns the page of results immediately after this object.

before_id?: string

Query param: ID of the object to use as a cursor for pagination. When provided, returns the page of results immediately before this object.

limit?: number

Query param: Number of items to return per page.

Defaults to 20. Ranges from 1 to 1000.

maximum1000

minimum1

betas?: Array<AnthropicBeta>

Header param: Optional header to specify the beta version(s) you want to use.

Accepts one of the following:

(string & {})

"message-batches-2024-09-24" | "prompt-caching-2024-07-31" | "computer-use-2024-10-22" | 16 more

"message-batches-2024-09-24"

"prompt-caching-2024-07-31"

"computer-use-2024-10-22"

"computer-use-2025-01-24"

"pdfs-2024-09-25"

"token-counting-2024-11-01"

"token-efficient-tools-2025-02-19"

"output-128k-2025-02-19"

"files-api-2025-04-14"

"mcp-client-2025-04-04"

"mcp-client-2025-11-20"

"dev-full-thinking-2025-05-14"

"interleaved-thinking-2025-05-14"

"code-execution-2025-05-22"

"extended-cache-ttl-2025-04-11"

"context-1m-2025-08-07"

"context-management-2025-06-27"

"model-context-window-exceeded-2025-08-26"

"skills-2025-10-02"

ReturnsExpand Collapse

ModelInfo { id, created_at, display_name, type }

id: string

Unique model identifier.

created_at: string

RFC 3339 datetime string representing the time at which the model was released. May be set to an epoch value if the release date is unknown.

formatdate-time

display_name: string

A human-readable name for the model.

type: "model"

Object type.

For Models, this is always "model".

Accepts one of the following:

"model"

List Models

import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic({
  apiKey: process.env['ANTHROPIC_API_KEY'], // This is the default and can be omitted
});

// Automatically fetches more pages as needed.
for await (const modelInfo of client.models.list()) {
  console.log(modelInfo.id);
}

Response 200

{
  "data": [
    {
      "id": "claude-sonnet-4-20250514",
      "created_at": "2025-02-19T00:00:00Z",
      "display_name": "Claude Sonnet 4",
      "type": "model"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

Returns Examples

Response 200

{
  "data": [
    {
      "id": "claude-sonnet-4-20250514",
      "created_at": "2025-02-19T00:00:00Z",
      "display_name": "Claude Sonnet 4",
      "type": "model"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

import Anthropic from '@anthropic-ai/sdk'; const client = new Anthropic({ apiKey: process.env['ANTHROPIC_API_KEY'], // This is the default and can be omitted }); // Automatically fetches more pages as needed. for await (const modelInfo of client.models.list()) { console.log(modelInfo.id); }

{ "data": [ { "id": "claude-sonnet-4-20250514", "created_at": "2025-02-19T00:00:00Z", "display_name": "Claude Sonnet 4", "type": "model" } ], "first_id": "first_id", "has_more": true, "last_id": "last_id" }