Models

List Models

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.

Query Parameters

after_id: optional 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: optional string

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

Number of items to return per page.

Defaults to 20. Ranges from 1 to 1000.

Header Parameters

"anthropic-beta": optional array of AnthropicBeta

Optional header to specify the beta version(s) you want to use.
- string
- "message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 22 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"
  - "output-300k-2026-03-24"
  - "user-profiles-2026-03-24"
  - "advisor-tool-2026-03-01"
  - "managed-agents-2026-04-01"
  - "cache-diagnosis-2026-04-07"

Returns

data: array of ModelInfo
- id: string
  
  Unique model identifier.
- capabilities: ModelCapabilities
  
  Model capability information.
  - batch: CapabilitySupport
    
    Whether the model supports the Batch API.
    - supported: boolean
      
      Whether this capability is supported by the model.
  - citations: CapabilitySupport
    
    Whether the model supports citation generation.
  - code_execution: CapabilitySupport
    
    Whether the model supports code execution tools.
  - context_management: ContextManagementCapability
    
    Context management support and available strategies.
    - clear_thinking_20251015: CapabilitySupport
      
      Indicates whether a capability is supported.
    - clear_tool_uses_20250919: CapabilitySupport
      
      Indicates whether a capability is supported.
    - compact_20260112: CapabilitySupport
      
      Indicates whether a capability is supported.
    - supported: boolean
      
      Whether this capability is supported by the model.
  - effort: EffortCapability
    
    Effort (reasoning_effort) support and available levels.
    - high: CapabilitySupport
      
      Whether the model supports high effort level.
    - low: CapabilitySupport
      
      Whether the model supports low effort level.
    - max: CapabilitySupport
      
      Whether the model supports max effort level.
    - medium: CapabilitySupport
      
      Whether the model supports medium effort level.
    - supported: boolean
      
      Whether this capability is supported by the model.
    - xhigh: CapabilitySupport
      
      Indicates whether a capability is supported.
  - image_input: CapabilitySupport
    
    Whether the model accepts image content blocks.
  - pdf_input: CapabilitySupport
    
    Whether the model accepts PDF content blocks.
  - structured_outputs: CapabilitySupport
    
    Whether the model supports structured output / JSON mode / strict tool schemas.
  - thinking: ThinkingCapability
    
    Thinking capability and supported type configurations.
    - supported: boolean
      
      Whether this capability is supported by the model.
    - types: ThinkingTypes
      
      Supported thinking type configurations.
      - adaptive: CapabilitySupport
        
        Whether the model supports thinking with type 'adaptive' (auto).
      - enabled: CapabilitySupport
        
        Whether the model supports thinking with type 'enabled'.
- 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
  
  Maximum input context window size in tokens for this model.
- max_tokens: number
  
  Maximum value for the max_tokens parameter when using this model.
- type: "model"
  
  Object type.
  
  For Models, this is always "model".
  - "model"
first_id: string

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

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

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

Example

curl https://api.anthropic.com/v1/models \
    -H 'anthropic-version: 2023-06-01' \
    -H "X-Api-Key: $ANTHROPIC_API_KEY"

Response

{
  "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,
          "xhigh": {
            "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"
}

Get a Model

get /v1/models/{model_id}

Get a specific model.

The Models API response can be used to determine information about a specific model or resolve a model alias to a model ID.

Path Parameters

model_id: string

Model identifier or alias.

Header Parameters

"anthropic-beta": optional array of AnthropicBeta

Optional header to specify the beta version(s) you want to use.
- string
- "message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 22 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"
  - "output-300k-2026-03-24"
  - "user-profiles-2026-03-24"
  - "advisor-tool-2026-03-01"
  - "managed-agents-2026-04-01"
  - "cache-diagnosis-2026-04-07"

Returns

ModelInfo object { id, capabilities, created_at, 4 more }
- id: string
  
  Unique model identifier.
- capabilities: ModelCapabilities
  
  Model capability information.
  - batch: CapabilitySupport
    
    Whether the model supports the Batch API.
    - supported: boolean
      
      Whether this capability is supported by the model.
  - citations: CapabilitySupport
    
    Whether the model supports citation generation.
  - code_execution: CapabilitySupport
    
    Whether the model supports code execution tools.
  - context_management: ContextManagementCapability
    
    Context management support and available strategies.
    - clear_thinking_20251015: CapabilitySupport
      
      Indicates whether a capability is supported.
    - clear_tool_uses_20250919: CapabilitySupport
      
      Indicates whether a capability is supported.
    - compact_20260112: CapabilitySupport
      
      Indicates whether a capability is supported.
    - supported: boolean
      
      Whether this capability is supported by the model.
  - effort: EffortCapability
    
    Effort (reasoning_effort) support and available levels.
    - high: CapabilitySupport
      
      Whether the model supports high effort level.
    - low: CapabilitySupport
      
      Whether the model supports low effort level.
    - max: CapabilitySupport
      
      Whether the model supports max effort level.
    - medium: CapabilitySupport
      
      Whether the model supports medium effort level.
    - supported: boolean
      
      Whether this capability is supported by the model.
    - xhigh: CapabilitySupport
      
      Indicates whether a capability is supported.
  - image_input: CapabilitySupport
    
    Whether the model accepts image content blocks.
  - pdf_input: CapabilitySupport
    
    Whether the model accepts PDF content blocks.
  - structured_outputs: CapabilitySupport
    
    Whether the model supports structured output / JSON mode / strict tool schemas.
  - thinking: ThinkingCapability
    
    Thinking capability and supported type configurations.
    - supported: boolean
      
      Whether this capability is supported by the model.
    - types: ThinkingTypes
      
      Supported thinking type configurations.
      - adaptive: CapabilitySupport
        
        Whether the model supports thinking with type 'adaptive' (auto).
      - enabled: CapabilitySupport
        
        Whether the model supports thinking with type 'enabled'.
- 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
  
  Maximum input context window size in tokens for this model.
- max_tokens: number
  
  Maximum value for the max_tokens parameter when using this model.
- type: "model"
  
  Object type.
  
  For Models, this is always "model".
  - "model"

Example

curl https://api.anthropic.com/v1/models/$MODEL_ID \
    -H 'anthropic-version: 2023-06-01' \
    -H "X-Api-Key: $ANTHROPIC_API_KEY"

Response

{
  "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,
      "xhigh": {
        "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"
}

Domain Types

Capability Support

CapabilitySupport object { supported }

Indicates whether a capability is supported.
- supported: boolean
  
  Whether this capability is supported by the model.

Context Management Capability

ContextManagementCapability object { clear_thinking_20251015, clear_tool_uses_20250919, compact_20260112, supported }

Context management capability details.
- clear_thinking_20251015: CapabilitySupport
  
  Indicates whether a capability is supported.
  - supported: boolean
    
    Whether this capability is supported by the model.
- clear_tool_uses_20250919: CapabilitySupport
  
  Indicates whether a capability is supported.
- compact_20260112: CapabilitySupport
  
  Indicates whether a capability is supported.
- supported: boolean
  
  Whether this capability is supported by the model.

Effort Capability

EffortCapability object { high, low, max, 3 more }

Effort (reasoning_effort) capability details.
- high: CapabilitySupport
  
  Whether the model supports high effort level.
  - supported: boolean
    
    Whether this capability is supported by the model.
- low: CapabilitySupport
  
  Whether the model supports low effort level.
- max: CapabilitySupport
  
  Whether the model supports max effort level.
- medium: CapabilitySupport
  
  Whether the model supports medium effort level.
- supported: boolean
  
  Whether this capability is supported by the model.
- xhigh: CapabilitySupport
  
  Indicates whether a capability is supported.

Model Capabilities

ModelCapabilities object { batch, citations, code_execution, 6 more }

Model capability information.
- batch: CapabilitySupport
  
  Whether the model supports the Batch API.
  - supported: boolean
    
    Whether this capability is supported by the model.
- citations: CapabilitySupport
  
  Whether the model supports citation generation.
- code_execution: CapabilitySupport
  
  Whether the model supports code execution tools.
- context_management: ContextManagementCapability
  
  Context management support and available strategies.
  - clear_thinking_20251015: CapabilitySupport
    
    Indicates whether a capability is supported.
  - clear_tool_uses_20250919: CapabilitySupport
    
    Indicates whether a capability is supported.
  - compact_20260112: CapabilitySupport
    
    Indicates whether a capability is supported.
  - supported: boolean
    
    Whether this capability is supported by the model.
- effort: EffortCapability
  
  Effort (reasoning_effort) support and available levels.
  - high: CapabilitySupport
    
    Whether the model supports high effort level.
  - low: CapabilitySupport
    
    Whether the model supports low effort level.
  - max: CapabilitySupport
    
    Whether the model supports max effort level.
  - medium: CapabilitySupport
    
    Whether the model supports medium effort level.
  - supported: boolean
    
    Whether this capability is supported by the model.
  - xhigh: CapabilitySupport
    
    Indicates whether a capability is supported.
- image_input: CapabilitySupport
  
  Whether the model accepts image content blocks.
- pdf_input: CapabilitySupport
  
  Whether the model accepts PDF content blocks.
- structured_outputs: CapabilitySupport
  
  Whether the model supports structured output / JSON mode / strict tool schemas.
- thinking: ThinkingCapability
  
  Thinking capability and supported type configurations.
  - supported: boolean
    
    Whether this capability is supported by the model.
  - types: ThinkingTypes
    
    Supported thinking type configurations.
    - adaptive: CapabilitySupport
      
      Whether the model supports thinking with type 'adaptive' (auto).
    - enabled: CapabilitySupport
      
      Whether the model supports thinking with type 'enabled'.

Model Info

ModelInfo object { id, capabilities, created_at, 4 more }
- id: string
  
  Unique model identifier.
- capabilities: ModelCapabilities
  
  Model capability information.
  - batch: CapabilitySupport
    
    Whether the model supports the Batch API.
    - supported: boolean
      
      Whether this capability is supported by the model.
  - citations: CapabilitySupport
    
    Whether the model supports citation generation.
  - code_execution: CapabilitySupport
    
    Whether the model supports code execution tools.
  - context_management: ContextManagementCapability
    
    Context management support and available strategies.
    - clear_thinking_20251015: CapabilitySupport
      
      Indicates whether a capability is supported.
    - clear_tool_uses_20250919: CapabilitySupport
      
      Indicates whether a capability is supported.
    - compact_20260112: CapabilitySupport
      
      Indicates whether a capability is supported.
    - supported: boolean
      
      Whether this capability is supported by the model.
  - effort: EffortCapability
    
    Effort (reasoning_effort) support and available levels.
    - high: CapabilitySupport
      
      Whether the model supports high effort level.
    - low: CapabilitySupport
      
      Whether the model supports low effort level.
    - max: CapabilitySupport
      
      Whether the model supports max effort level.
    - medium: CapabilitySupport
      
      Whether the model supports medium effort level.
    - supported: boolean
      
      Whether this capability is supported by the model.
    - xhigh: CapabilitySupport
      
      Indicates whether a capability is supported.
  - image_input: CapabilitySupport
    
    Whether the model accepts image content blocks.
  - pdf_input: CapabilitySupport
    
    Whether the model accepts PDF content blocks.
  - structured_outputs: CapabilitySupport
    
    Whether the model supports structured output / JSON mode / strict tool schemas.
  - thinking: ThinkingCapability
    
    Thinking capability and supported type configurations.
    - supported: boolean
      
      Whether this capability is supported by the model.
    - types: ThinkingTypes
      
      Supported thinking type configurations.
      - adaptive: CapabilitySupport
        
        Whether the model supports thinking with type 'adaptive' (auto).
      - enabled: CapabilitySupport
        
        Whether the model supports thinking with type 'enabled'.
- 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
  
  Maximum input context window size in tokens for this model.
- max_tokens: number
  
  Maximum value for the max_tokens parameter when using this model.
- type: "model"
  
  Object type.
  
  For Models, this is always "model".
  - "model"

Thinking Capability

ThinkingCapability object { supported, types }

Thinking capability details.
- supported: boolean
  
  Whether this capability is supported by the model.
- types: ThinkingTypes
  
  Supported thinking type configurations.
  - adaptive: CapabilitySupport
    
    Whether the model supports thinking with type 'adaptive' (auto).
    - supported: boolean
      
      Whether this capability is supported by the model.
  - enabled: CapabilitySupport
    
    Whether the model supports thinking with type 'enabled'.

Thinking Types

ThinkingTypes object { adaptive, enabled }

Supported thinking type configurations.
- adaptive: CapabilitySupport
  
  Whether the model supports thinking with type 'adaptive' (auto).
  - supported: boolean
    
    Whether this capability is supported by the model.
- enabled: CapabilitySupport
  
  Whether the model supports thinking with type 'enabled'.