List Models

ModelListPageResponse Models.List(, )

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

ModelListParams parameters

string afterID

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

string beforeID

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

Long limit

Query param: Number of items to return per page.

Defaults to 20. Ranges from 1 to 1000.

maximum1000

minimum1

IReadOnlyList<AnthropicBeta> betas

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

ReturnsExpand Collapse

class ModelListPageResponse:

required IReadOnlyList<ModelInfo> Data

required string ID

Unique model identifier.

required ModelCapabilities? Capabilities

Model capability information.

required CapabilitySupport Batch

Whether the model supports the Batch API.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport Citations

Whether the model supports citation generation.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport CodeExecution

Whether the model supports code execution tools.

required Boolean Supported

Whether this capability is supported by the model.

required ContextManagementCapability ContextManagement

Context management support and available strategies.

required CapabilitySupport? ClearThinking20251015

Indicates whether a capability is supported.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport? ClearToolUses20250919

Indicates whether a capability is supported.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport? Compact20260112

Indicates whether a capability is supported.

required Boolean Supported

Whether this capability is supported by the model.

required Boolean Supported

Whether this capability is supported by the model.

required EffortCapability Effort

Effort (reasoning_effort) support and available levels.

required CapabilitySupport High

Whether the model supports high effort level.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport Low

Whether the model supports low effort level.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport Max

Whether the model supports max effort level.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport Medium

Whether the model supports medium effort level.

required Boolean Supported

Whether this capability is supported by the model.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport ImageInput

Whether the model accepts image content blocks.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport PdfInput

Whether the model accepts PDF content blocks.

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport StructuredOutputs

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

required Boolean Supported

Whether this capability is supported by the model.

required ThinkingCapability Thinking

Thinking capability and supported type configurations.

required Boolean Supported

Whether this capability is supported by the model.

required ThinkingTypes Types

Supported thinking type configurations.

required CapabilitySupport Adaptive

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

required Boolean Supported

Whether this capability is supported by the model.

required CapabilitySupport Enabled

Whether the model supports thinking with type 'enabled'.

required Boolean Supported

Whether this capability is supported by the model.

required DateTimeOffset CreatedAt

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.

required string DisplayName

A human-readable name for the model.

required Long? MaxInputTokens

Maximum input context window size in tokens for this model.

required Long? MaxTokens

Maximum value for the max_tokens parameter when using this model.

JsonElement Type

Object type.

For Models, this is always "model".

required string? FirstID

First ID in the data list. Can be used as the before_id for the previous page.

required Boolean HasMore

Indicates if there are more results in the requested page direction.

required string? LastID

Last ID in the data list. Can be used as the after_id for the next page.

List Models

ModelListParams parameters = new();

var page = await client.Models.List(parameters);
await foreach (var item in page.Paginate())
{
    Console.WriteLine(item);
}

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"
}