# Models ## List Models `models.list(ModelListParams**kwargs) -> SyncPage[ModelInfo]` **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. ### Parameters - `after_id: Optional[str]` 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[str]` ID of the object to use as a cursor for pagination. When provided, returns the page of results immediately before this object. - `limit: Optional[int]` Number of items to return per page. Defaults to `20`. Ranges from `1` to `1000`. - `betas: Optional[List[AnthropicBetaParam]]` Optional header to specify the beta version(s) you want to use. - `str` - `Literal["message-batches-2024-09-24", "prompt-caching-2024-07-31", "computer-use-2024-10-22", 25 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"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"fallback-credit-2026-06-01"` ### Returns - `class ModelInfo: …` - `id: str` Unique model identifier. - `capabilities: Optional[ModelCapabilities]` Model capability information. - `batch: CapabilitySupport` Whether the model supports the Batch API. - `supported: bool` 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: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `clear_tool_uses_20250919: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `compact_20260112: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `supported: bool` 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: bool` Whether this capability is supported by the model. - `xhigh: Optional[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: bool` 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: datetime` 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: str` A human-readable name for the model. - `max_input_tokens: Optional[int]` Maximum input context window size in tokens for this model. - `max_tokens: Optional[int]` Maximum value for the `max_tokens` parameter when using this model. - `type: Literal["model"]` Object type. For Models, this is always `"model"`. - `"model"` ### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get("ANTHROPIC_API_KEY"), # This is the default and can be omitted ) page = client.models.list() page = page.data[0] print(page.id) ``` #### Response ```json { "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 `models.retrieve(strmodel_id, ModelRetrieveParams**kwargs) -> ModelInfo` **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. ### Parameters - `model_id: str` Model identifier or alias. - `betas: Optional[List[AnthropicBetaParam]]` Optional header to specify the beta version(s) you want to use. - `str` - `Literal["message-batches-2024-09-24", "prompt-caching-2024-07-31", "computer-use-2024-10-22", 25 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"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"fallback-credit-2026-06-01"` ### Returns - `class ModelInfo: …` - `id: str` Unique model identifier. - `capabilities: Optional[ModelCapabilities]` Model capability information. - `batch: CapabilitySupport` Whether the model supports the Batch API. - `supported: bool` 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: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `clear_tool_uses_20250919: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `compact_20260112: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `supported: bool` 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: bool` Whether this capability is supported by the model. - `xhigh: Optional[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: bool` 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: datetime` 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: str` A human-readable name for the model. - `max_input_tokens: Optional[int]` Maximum input context window size in tokens for this model. - `max_tokens: Optional[int]` Maximum value for the `max_tokens` parameter when using this model. - `type: Literal["model"]` Object type. For Models, this is always `"model"`. - `"model"` ### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get("ANTHROPIC_API_KEY"), # This is the default and can be omitted ) model_info = client.models.retrieve( model_id="model_id", ) print(model_info.id) ``` #### Response ```json { "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 - `class CapabilitySupport: …` Indicates whether a capability is supported. - `supported: bool` Whether this capability is supported by the model. ### Context Management Capability - `class ContextManagementCapability: …` Context management capability details. - `clear_thinking_20251015: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `supported: bool` Whether this capability is supported by the model. - `clear_tool_uses_20250919: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `compact_20260112: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `supported: bool` Whether this capability is supported by the model. ### Effort Capability - `class EffortCapability: …` Effort (reasoning_effort) capability details. - `high: CapabilitySupport` Whether the model supports high effort level. - `supported: bool` 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: bool` Whether this capability is supported by the model. - `xhigh: Optional[CapabilitySupport]` Indicates whether a capability is supported. ### Model Capabilities - `class ModelCapabilities: …` Model capability information. - `batch: CapabilitySupport` Whether the model supports the Batch API. - `supported: bool` 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: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `clear_tool_uses_20250919: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `compact_20260112: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `supported: bool` 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: bool` Whether this capability is supported by the model. - `xhigh: Optional[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: bool` 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 - `class ModelInfo: …` - `id: str` Unique model identifier. - `capabilities: Optional[ModelCapabilities]` Model capability information. - `batch: CapabilitySupport` Whether the model supports the Batch API. - `supported: bool` 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: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `clear_tool_uses_20250919: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `compact_20260112: Optional[CapabilitySupport]` Indicates whether a capability is supported. - `supported: bool` 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: bool` Whether this capability is supported by the model. - `xhigh: Optional[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: bool` 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: datetime` 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: str` A human-readable name for the model. - `max_input_tokens: Optional[int]` Maximum input context window size in tokens for this model. - `max_tokens: Optional[int]` Maximum value for the `max_tokens` parameter when using this model. - `type: Literal["model"]` Object type. For Models, this is always `"model"`. - `"model"` ### Thinking Capability - `class ThinkingCapability: …` Thinking capability details. - `supported: bool` 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: bool` Whether this capability is supported by the model. - `enabled: CapabilitySupport` Whether the model supports thinking with type 'enabled'. ### Thinking Types - `class ThinkingTypes: …` Supported thinking type configurations. - `adaptive: CapabilitySupport` Whether the model supports thinking with type 'adaptive' (auto). - `supported: bool` Whether this capability is supported by the model. - `enabled: CapabilitySupport` Whether the model supports thinking with type 'enabled'.