> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-a46887cf.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Architecture - Go SDK

> Architecture type definition

<Warning>
  The Go SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/go-sdk/issues).
</Warning>

Model architecture information

## Fields

| Field              | Type                                                                                | Required             | Description                   | Example |
| ------------------ | ----------------------------------------------------------------------------------- | -------------------- | ----------------------------- | ------- |
| `InputModalities`  | \[][components.InputModality](/client-sdks/go/api-reference/models/inputmodality)   | :heavy\_check\_mark: | Supported input modalities    |         |
| `InstructType`     | [\*components.InstructType](/client-sdks/go/api-reference/models/instructtype)      | :heavy\_check\_mark: | Instruction format type       | chatml  |
| `Modality`         | `*string`                                                                           | :heavy\_check\_mark: | Primary modality of the model | text    |
| `OutputModalities` | \[][components.OutputModality](/client-sdks/go/api-reference/models/outputmodality) | :heavy\_check\_mark: | Supported output modalities   |         |
| `Tokenizer`        | [\*components.Tokenizer](/client-sdks/go/api-reference/models/tokenizer)            | :heavy\_check\_mark: | N/A                           | GPT     |