> ## 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.

# CreateEmbeddingsRequest

Embeddings request input

## Fields

| Field | Type | Required | Description | Example |
| - | - | - | - | - |
| `Dimensions` | `*int64` | :heavy\_minus\_sign: | The number of dimensions for the output embeddings | 1536 |
| `EncodingFormat` | [\*operations.EncodingFormat](../../models/operations/encodingformat.mdx) | :heavy\_minus\_sign: | The format of the output embeddings | float |
| `Input` | [operations.InputUnion](../../models/operations/inputunion.mdx) | :heavy\_check\_mark: | Text, token, or multimodal input(s) to embed | The quick brown fox jumps over the lazy dog |
| `InputType` | `*string` | :heavy\_minus\_sign: | The type of input (e.g. search\_query, search\_document) | search\_query |
| `Model` | `string` | :heavy\_check\_mark: | The model to use for embeddings | openai/text-embedding-3-small |
| `Provider` | optionalnullable.OptionalNullable\[[components.ProviderPreferences](../../models/components/providerpreferences.mdx)] | :heavy\_minus\_sign: | N/A | \{<br />"allow\_fallbacks": true<br />} |
| `SessionID` | `*string` | :heavy\_minus\_sign: | A unique identifier for grouping related requests (e.g., a conversation or agent workflow). Used for observability grouping in Broadcast and private logging; never sent to the provider. If provided in both the request body and the x-session-id header, the body value takes precedence. Maximum of 256 characters. | session-1234 |
| `Trace` | [\*components.TraceConfig](../../models/components/traceconfig.mdx) | :heavy\_minus\_sign: | Metadata for observability and tracing. Known keys (trace\_id, trace\_name, span\_name, generation\_name, parent\_span\_id) have special handling. Additional keys are passed through as custom metadata to configured broadcast destinations. | \{<br />"trace\_id": "trace-abc123",<br />"trace\_name": "my-app-trace"<br />} |
| `User` | `*string` | :heavy\_minus\_sign: | A unique identifier for the end-user | user-1234 |