List Models

client.beta.models.list(?, ?): Page<BetaModelInfo { id, capabilities, created_at, 4 more } >

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" | 17 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"

"fast-mode-2026-02-01"

ReturnsExpand Collapse

BetaModelInfo { id, capabilities, created_at, 4 more }

id: string

Unique model identifier.

capabilities: BetaModelCapabilities { batch, citations, code_execution, 6 more } | null

Model capability information.

batch: BetaCapabilitySupport { supported }

Whether the model supports the Batch API.

supported: boolean

Whether this capability is supported by the model.

citations: BetaCapabilitySupport { supported }

Whether the model supports citation generation.

supported: boolean

Whether this capability is supported by the model.

code_execution: BetaCapabilitySupport { supported }

Whether the model supports code execution tools.

supported: boolean

Whether this capability is supported by the model.

context_management: BetaContextManagementCapability { clear_thinking_20251015, clear_tool_uses_20250919, compact_20260112, supported }

Context management support and available strategies.

clear_thinking_20251015: BetaCapabilitySupport { supported } | null

Indicates whether a capability is supported.

supported: boolean

Whether this capability is supported by the model.

clear_tool_uses_20250919: BetaCapabilitySupport { supported } | null

Indicates whether a capability is supported.

supported: boolean

Whether this capability is supported by the model.

compact_20260112: BetaCapabilitySupport { supported } | null

Indicates whether a capability is supported.

supported: boolean

Whether this capability is supported by the model.

supported: boolean

Whether this capability is supported by the model.

effort: BetaEffortCapability { high, low, max, 2 more }

Effort (reasoning_effort) support and available levels.

high: BetaCapabilitySupport { supported }

Whether the model supports high effort level.

supported: boolean

Whether this capability is supported by the model.

low: BetaCapabilitySupport { supported }

Whether the model supports low effort level.

supported: boolean

Whether this capability is supported by the model.

max: BetaCapabilitySupport { supported }

Whether the model supports max effort level.

supported: boolean

Whether this capability is supported by the model.

medium: BetaCapabilitySupport { supported }

Whether the model supports medium effort level.

supported: boolean

Whether this capability is supported by the model.

supported: boolean

Whether this capability is supported by the model.

image_input: BetaCapabilitySupport { supported }

Whether the model accepts image content blocks.

supported: boolean

Whether this capability is supported by the model.

pdf_input: BetaCapabilitySupport { supported }

Whether the model accepts PDF content blocks.

supported: boolean

Whether this capability is supported by the model.

structured_outputs: BetaCapabilitySupport { supported }

Whether the model supports structured output / JSON mode / strict tool schemas.

supported: boolean

Whether this capability is supported by the model.

thinking: BetaThinkingCapability { supported, types }

Thinking capability and supported type configurations.

supported: boolean

Whether this capability is supported by the model.

types: BetaThinkingTypes { adaptive, enabled }

Supported thinking type configurations.

adaptive: BetaCapabilitySupport { supported }

Whether the model supports thinking with type 'adaptive' (auto).

supported: boolean

Whether this capability is supported by the model.

enabled: BetaCapabilitySupport { supported }

Whether the model supports thinking with type 'enabled'.

supported: boolean

Whether this capability is supported by the model.

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.

display_name: string

A human-readable name for the model.

max_input_tokens: number | null

Maximum input context window size in tokens for this model.

max_tokens: number | null

Maximum value for the max_tokens parameter when using this model.

type: "model"

Object type.

For Models, this is always "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 betaModelInfo of client.beta.models.list()) {
  console.log(betaModelInfo.id);
}

Response 200

{
  "data": [
    {
      "id": "claude-opus-4-6",
      "capabilities": {
        "batch": {
          "supported": true
        },
        "citations": {
          "supported": true
        },
        "code_execution": {
          "supported": true
        },
        "context_management": {
          "clear_thinking_20251015": {
            "supported": true
          },
          "clear_tool_uses_20250919": {
            "supported": true
          },
          "compact_20260112": {
            "supported": true
          },
          "supported": true
        },
        "effort": {
          "high": {
            "supported": true
          },
          "low": {
            "supported": true
          },
          "max": {
            "supported": true
          },
          "medium": {
            "supported": true
          },
          "supported": true
        },
        "image_input": {
          "supported": true
        },
        "pdf_input": {
          "supported": true
        },
        "structured_outputs": {
          "supported": true
        },
        "thinking": {
          "supported": true,
          "types": {
            "adaptive": {
              "supported": true
            },
            "enabled": {
              "supported": true
            }
          }
        }
      },
      "created_at": "2026-02-04T00:00:00Z",
      "display_name": "Claude Opus 4.6",
      "max_input_tokens": 0,
      "max_tokens": 0,
      "type": "model"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

Returns Examples

Response 200

{
  "data": [
    {
      "id": "claude-opus-4-6",
      "capabilities": {
        "batch": {
          "supported": true
        },
        "citations": {
          "supported": true
        },
        "code_execution": {
          "supported": true
        },
        "context_management": {
          "clear_thinking_20251015": {
            "supported": true
          },
          "clear_tool_uses_20250919": {
            "supported": true
          },
          "compact_20260112": {
            "supported": true
          },
          "supported": true
        },
        "effort": {
          "high": {
            "supported": true
          },
          "low": {
            "supported": true
          },
          "max": {
            "supported": true
          },
          "medium": {
            "supported": true
          },
          "supported": true
        },
        "image_input": {
          "supported": true
        },
        "pdf_input": {
          "supported": true
        },
        "structured_outputs": {
          "supported": true
        },
        "thinking": {
          "supported": true,
          "types": {
            "adaptive": {
              "supported": true
            },
            "enabled": {
              "supported": true
            }
          }
        }
      },
      "created_at": "2026-02-04T00:00:00Z",
      "display_name": "Claude Opus 4.6",
      "max_input_tokens": 0,
      "max_tokens": 0,
      "type": "model"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}