> ## 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 |
| - | - | - | - | - |
| `AliasTarget` | [\*components.ModelAliasTarget](../../models/components/modelaliastarget.mdx) | :heavy\_minus\_sign: | Concrete model targeted by this tilde-latest alias, when applicable | \{ "name": "Claude Sonnet 4.5", "slug": "anthropic/claude-sonnet-4.5" } |
| `Architecture` | [components.ModelArchitecture](../../models/components/modelarchitecture.mdx) | :heavy\_check\_mark: | Model architecture information | \{ "input\_modalities": \[ "text" ], "instruct\_type": "chatml", "modality": "text-\u003etext", "output\_modalities": \[ "text" ], "tokenizer": "GPT" } |
| `Benchmarks` | [\*components.ModelBenchmarks](../../models/components/modelbenchmarks.mdx) | :heavy\_minus\_sign: | 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 } ] } |
| `CanonicalSlug` | `string` | :heavy\_check\_mark: | Canonical slug for the model | openai/gpt-4 |
| `ContextLength` | `*int64` | :heavy\_check\_mark: | Maximum context length in tokens | 8192 |
| `Created` | `int64` | :heavy\_check\_mark: | Unix timestamp of when the model was created | 1692901234 |
| `DefaultParameters` | [\*components.DefaultParameters](../../models/components/defaultparameters.mdx) | :heavy\_check\_mark: | 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` | `*string` | :heavy\_minus\_sign: | Description of the model | GPT-4 is a large multimodal model that can solve difficult problems with greater accuracy. |
| `ExpirationDate` | optionalnullable.OptionalNullable\[`string`] | :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 |
| `HuggingFaceID` | optionalnullable.OptionalNullable\[`string`] | :heavy\_minus\_sign: | Hugging Face model identifier, if applicable | microsoft/DialoGPT-medium |
| `ID` | `string` | :heavy\_check\_mark: | Unique identifier for the model | openai/gpt-4 |
| `KnowledgeCutoff` | optionalnullable.OptionalNullable\[`string`] | :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](../../models/components/modellinks.mdx) | :heavy\_check\_mark: | Related API endpoints and resources for this model. | \{ "details": "/api/v1/models/openai/gpt-5.4/endpoints" } |
| `Name` | `string` | :heavy\_check\_mark: | Display name of the model | GPT-4 |
| `PerRequestLimits` | [\*components.PerRequestLimits](../../models/components/perrequestlimits.mdx) | :heavy\_check\_mark: | Per-request token limits | \{ "completion\_tokens": 1000, "prompt\_tokens": 1000 } |
| `Pricing` | [components.PublicPricing](../../models/components/publicpricing.mdx) | :heavy\_check\_mark: | Pricing information for the model | \{ "completion": "0.00006", "image": "0", "prompt": "0.00003", "request": "0" } |
| `Reasoning` | [\*components.ModelReasoning](../../models/components/modelreasoning.mdx) | :heavy\_minus\_sign: | 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" ] } |
| `SupportedParameters` | \[][components.Parameter](../../models/components/parameter.mdx) | :heavy\_check\_mark: | List of supported parameters for this model | |
| `SupportedVoices` | \[]`string` | :heavy\_check\_mark: | List of supported voice identifiers for TTS models. Null for non-TTS models. | null |
| `TopProvider` | [components.TopProviderInfo](../../models/components/topproviderinfo.mdx) | :heavy\_check\_mark: | Information about the top provider for this model | \{ "context\_length": 8192, "is\_moderated": true, "max\_completion\_tokens": 4096 } |