List Models

models.list(**kwargs) -> 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

after_id: String

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

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

limit: Integer

Number of items to return per page.

Defaults to 20. Ranges from 1 to 1000.

maximum1000

minimum1

anthropic_beta: Array[AnthropicBeta]

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" | 17 more

Accepts one of the following:

:"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"

:"fast-mode-2026-02-01"

ReturnsExpand Collapse

class ModelInfo { id, created_at, display_name, type }

id: String

Unique model identifier.

created_at: Time

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.

display_name: String

A human-readable name for the model.

type: :model

Object type.

For Models, this is always "model".

List Models

require "anthropic"

anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key")

page = anthropic.models.list

puts(page)

Response 200

{
  "data": [
    {
      "id": "claude-opus-4-6",
      "created_at": "2026-02-04T00:00:00Z",
      "display_name": "Claude Opus 4.6",
      "type": "model"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

Returns Examples

Response 200

{
  "data": [
    {
      "id": "claude-opus-4-6",
      "created_at": "2026-02-04T00:00:00Z",
      "display_name": "Claude Opus 4.6",
      "type": "model"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

List Models

models.list(**kwargs) -> 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

after_id: String

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

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

limit: Integer

Number of items to return per page.

Defaults to 20. Ranges from 1 to 1000.

maximum1000

minimum1

anthropic_beta: Array[AnthropicBeta]

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" | 17 more

Accepts one of the following:

:"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"

:"fast-mode-2026-02-01"

ReturnsExpand Collapse

class ModelInfo { id, created_at, display_name, type }

id: String

Unique model identifier.

created_at: Time

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.

display_name: String

A human-readable name for the model.

type: :model

Object type.

For Models, this is always "model".

List Models

require "anthropic"

anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key")

page = anthropic.models.list

puts(page)

Response 200

{
  "data": [
    {
      "id": "claude-opus-4-6",
      "created_at": "2026-02-04T00:00:00Z",
      "display_name": "Claude Opus 4.6",
      "type": "model"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

Returns Examples

Response 200

{
  "data": [
    {
      "id": "claude-opus-4-6",
      "created_at": "2026-02-04T00:00:00Z",
      "display_name": "Claude Opus 4.6",
      "type": "model"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}