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