> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Model

Information about an AI model available on OpenRouter

## Fields

| Field | Type | Required | Description | Example |
| - | - | - | - | - |
| `alias_target` | [Optional\[components.ModelAliasTarget\]](../components/modelaliastarget.mdx) | :heavy\_minus\_sign: | Concrete model targeted by this tilde-latest alias, when applicable | \{<br />"name": "Claude Sonnet 4.5",<br />"slug": "anthropic/claude-sonnet-4.5"<br />} |
| `architecture` | [components.ModelArchitecture](../components/modelarchitecture.mdx) | :heavy\_check\_mark: | Model architecture information | \{<br />"input\_modalities": \[<br />"text"<br />],<br />"instruct\_type": "chatml",<br />"modality": "text-\u003etext",<br />"output\_modalities": \[<br />"text"<br />],<br />"tokenizer": "GPT"<br />} |
| `benchmarks` | [Optional\[components.ModelBenchmarks\]](../components/modelbenchmarks.mdx) | :heavy\_minus\_sign: | Third-party benchmark rankings for this model. Omitted when no benchmark data is available. | \{<br />"artificial\_analysis": \{<br />"agentic\_index": 55.8,<br />"coding\_index": 63.2,<br />"intelligence\_index": 71.4<br />},<br />"design\_arena": \[<br />\{<br />"arena": "models",<br />"category": "website",<br />"elo": 1385.2,<br />"rank": 5,<br />"win\_rate": 62.5<br />}<br />]<br />} |
| `canonical_slug` | *str* | :heavy\_check\_mark: | Canonical slug for the model | openai/gpt-4 |
| `context_length` | *Nullable\[int]* | :heavy\_check\_mark: | Maximum context length in tokens | 8192 |
| `created` | *int* | :heavy\_check\_mark: | Unix timestamp of when the model was created | 1692901234 |
| `default_parameters` | [Nullable\[components.DefaultParameters\]](../components/defaultparameters.mdx) | :heavy\_check\_mark: | Default parameters for this model | \{<br />"frequency\_penalty": 0,<br />"presence\_penalty": 0,<br />"repetition\_penalty": 1,<br />"temperature": 0.7,<br />"top\_k": 0,<br />"top\_p": 0.9<br />} |
| `description` | *Optional\[str]* | :heavy\_minus\_sign: | Description of the model | GPT-4 is a large multimodal model that can solve difficult problems with greater accuracy. |
| `expiration_date` | *OptionalNullable\[str]* | :heavy\_minus\_sign: | The date after which the model may be removed. ISO 8601 date string (YYYY-MM-DD) or null if no expiration. | 2025-06-01 |
| `hugging_face_id` | *OptionalNullable\[str]* | :heavy\_minus\_sign: | Hugging Face model identifier, if applicable | microsoft/DialoGPT-medium |
| `id` | *str* | :heavy\_check\_mark: | Unique identifier for the model | openai/gpt-4 |
| `knowledge_cutoff` | *OptionalNullable\[str]* | :heavy\_minus\_sign: | The date up to which the model was trained on data. ISO 8601 date string (YYYY-MM-DD) or null if unknown. | 2024-10-01 |
| `links` | [components.ModelLinks](../components/modellinks.mdx) | :heavy\_check\_mark: | Related API endpoints and resources for this model. | \{<br />"details": "/api/v1/models/openai/gpt-5.4/endpoints"<br />} |
| `name` | *str* | :heavy\_check\_mark: | Display name of the model | GPT-4 |
| `per_request_limits` | [Nullable\[components.PerRequestLimits\]](../components/perrequestlimits.mdx) | :heavy\_check\_mark: | Per-request token limits | \{<br />"completion\_tokens": 1000,<br />"prompt\_tokens": 1000<br />} |
| `pricing` | [components.PublicPricing](../components/publicpricing.mdx) | :heavy\_check\_mark: | Pricing information for the model | \{<br />"completion": "0.00006",<br />"image": "0",<br />"prompt": "0.00003",<br />"request": "0"<br />} |
| `reasoning` | [Optional\[components.ModelReasoning\]](../components/modelreasoning.mdx) | :heavy\_minus\_sign: | Reasoning effort configuration. Omitted for non-reasoning models and dynamic router models. | \{<br />"default\_effort": "medium",<br />"default\_enabled": true,<br />"mandatory": false,<br />"supported\_efforts": \[<br />"high",<br />"medium",<br />"low",<br />"minimal"<br />]<br />} |
| `supported_parameters` | List\[[components.Parameter](../components/parameter.mdx)] | :heavy\_check\_mark: | List of supported parameters for this model | |
| `supported_voices` | List\[*str*] | :heavy\_check\_mark: | List of supported voice identifiers for TTS models. Null for non-TTS models. | null |
| `top_provider` | [components.TopProviderInfo](../components/topproviderinfo.mdx) | :heavy\_check\_mark: | Information about the top provider for this model | \{<br />"context\_length": 8192,<br />"is\_moderated": true,<br />"max\_completion\_tokens": 4096<br />} |