---
title: Get a Model
url: https://platform.claude.com/docs/en/api/php/beta/models/retrieve
---

# Get a Model

`$client->beta->models->retrieve(string modelID, ?list<AnthropicBeta> betas, ?string workspaceID): BetaModelInfo`

**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

- `modelID: string` (path parameter)

  Model identifier or alias.

- `betas?: optional list<AnthropicBeta>` (header parameter)

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

- `workspaceID?: optional string` (header parameter)

  Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).

  Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace.

## Returns

- `class BetaModelInfo`

  - `"model" type`

    Object type.

    For Models, this is always `"model"`.

  - `string id`

    Unique model identifier.

  - `?list<string> allowedFallbackModels`

    Model IDs this model accepts as `fallbacks[i].model` on the Messages API. An empty list means the `fallbacks` parameter is not supported for this model as primary.

  - `?BetaModelCapabilities capabilities`

    Object mapping capability names to their support details. Keys are always present for all known capabilities.

  - `\Datetime 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.

  - `?\Datetime deprecatedAt`

    RFC 3339 datetime string representing the time of the model's most recent deprecation. Populated for `deprecated` and `retired` models; `null` while the model is `active`.

  - `string displayName`

    A human-readable name for the model.

  - `Lifecycle lifecycle`

    The model's current lifecycle stage.

    - `active`: The model is available for use, open to new adopters, and not scheduled for retirement.
    - `deprecated`: The model remains callable for organizations with existing access, but is headed for retirement and closed to new adopters.
    - `retired`: The model is no longer available for use; inference requests naming it fail. It remains in the catalogue as the historical record of its retirement.

  - `?BetaModelLine line`

    The model line this model belongs to, such as `opus` for both Claude Opus 4.5 and Claude Opus 4.6. More lines may be added. `null` when the model belongs to no line; do not infer a line from the `id`.

  - `?int maxInputTokens`

    Maximum input context window size in tokens for this model.

  - `?int maxTokens`

    Maximum value for the `max_tokens` parameter when using this model.

  - `?\Datetime retiresAt`

    RFC 3339 datetime string representing the model's currently scheduled retirement date. The schedule can be revised until retirement occurs; `null` while the model is `active` or while no retirement is scheduled. A past date on a `deprecated` model means retirement is overdue, not that it has occurred: `lifecycle` is the retirement signal.

## Example

```php
<?php

require_once dirname(__DIR__) . '/vendor/autoload.php';

use Anthropic\Client;
use Anthropic\Beta\AnthropicBeta;

$client = new Client(apiKey: 'my-anthropic-api-key');

$betaModelInfo = $client->beta->models->retrieve(
  'model_id',
  betas: [AnthropicBeta::MESSAGE_BATCHES_2024_09_24],
  workspaceID: 'wrkspc_011CZkZaBF1tNoB5wlCeusgy',
);

var_dump($betaModelInfo);
```

### Response (200)

```json
{
  "id": "claude-opus-5-5",
  "allowed_fallback_models": [
    "string"
  ],
  "capabilities": {
    "batch": {
      "supported": true
    },
    "citations": {
      "supported": true
    },
    "code_execution": {
      "supported": true
    },
    "compaction": {
      "summarize": {
        "supported": true
      },
      "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
    },
    "server_tools": {
      "code_execution": {
        "supported": true
      },
      "supported": true,
      "web_search": {
        "supported": true
      }
    },
    "structured_outputs": {
      "supported": true
    },
    "thinking": {
      "supported": true,
      "types": {
        "adaptive": {
          "supported": true
        },
        "between_tools": {
          "supported": true
        },
        "disabled": {
          "supported": true
        },
        "enabled": {
          "supported": true
        }
      }
    }
  },
  "created_at": "2026-09-21T00:00:00Z",
  "deprecated_at": "2019-12-27T18:11:19.117Z",
  "display_name": "Claude Opus 5.5",
  "lifecycle": "active",
  "line": "opus",
  "max_input_tokens": 0,
  "max_tokens": 0,
  "retires_at": "2019-12-27T18:11:19.117Z",
  "type": "model"
}
```