> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-5b6e02fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Architecture - Python SDK

> Architecture method reference

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

Model architecture information

## Fields

| Field               | Type                                                                                            | Required             | Description                   | Example |
| ------------------- | ----------------------------------------------------------------------------------------------- | -------------------- | ----------------------------- | ------- |
| `tokenizer`         | [Nullable\[components.Tokenizer\]](../components/tokenizer.md)                                  | :heavy\_check\_mark: | N/A                           | GPT     |
| `instruct_type`     | [Nullable\[components.InstructType\]](../components/instructtype.md)                            | :heavy\_check\_mark: | Instruction format type       |         |
| `modality`          | *Nullable\[str]*                                                                                | :heavy\_check\_mark: | Primary modality of the model | text    |
| `input_modalities`  | List\[[components.InputModality](/client-sdks/python/api-reference/components/inputmodality)]   | :heavy\_check\_mark: | Supported input modalities    |         |
| `output_modalities` | List\[[components.OutputModality](/client-sdks/python/api-reference/components/outputmodality)] | :heavy\_check\_mark: | Supported output modalities   |         |