Presets

Create a preset from a messages request body

Changed on

Creates a preset (or a new version of an existing one) from an inference request body. Only fields that overlap with the preset config are persisted; other fields (e.g. messages, stream, prompt) are silently ignored.

post/presets/{slug}/messages

Request

  • Base URL: https://openrouter.ai/api/v1
  • URL: https://openrouter.ai/api/v1/presets/{slug}/messages
  • Auth: HTTP bearer

Path parameters

slugstring required

URL-safe slug identifying the preset. Created if it does not exist.

Example:my-preset

Request body

max_tokensinteger
modelstring required
modelsstring[]
route'fallback' | 'sort' | 'null' nullable

DEPRECATED Use providers.sort.partition instead. Backwards-compatible alias for providers.sort.partition. Accepts legacy values: "fallback" (maps to "model"), "sort" (maps to "none").

service_tierstring
session_idstring

A unique identifier for grouping related requests (e.g., a conversation or agent workflow). When provided, OpenRouter uses it as the sticky routing key, routing all requests in the session to the same provider to maximize prompt cache hits. Also used for observability grouping. If provided in both the request body and the x-session-id header, the body value takes precedence. Maximum of 256 characters.

speed'fast' | 'standard' | 'null' nullable

Controls output generation speed. When set to fast, uses a higher-speed inference configuration at premium pricing. Defaults to standard when omitted.

stop_sequencesstring[]
streamboolean
temperaturenumber double
top_kinteger
top_pnumber double
userstring

A unique identifier representing your end-user, which helps distinguish between different users of your app. This allows your app to identify specific users in case of abuse reports, preventing your entire app from being affected by the actions of individual users. Maximum of 256 characters.

Example request

{
  "max_tokens": 1024,
  "messages": [
    {
      "content": "Hello, how are you?",
      "role": "user"
    }
  ],
  "model": "anthropic/claude-4.5-sonnet-20250929",
  "temperature": 0.7
}

Response

Preset created or updated successfully.

Example response

{
  "data": {
    "created_at": "2026-04-20T10:00:00Z",
    "creator_user_id": "user_2dHFtVWx2n56w6HkM0000000000",
    "description": null,
    "designated_version": {
      "config": {
        "model": "openai/gpt-4o",
        "temperature": 0.7
      },
      "created_at": "2026-04-20T10:00:00Z",
      "creator_id": "user_2dHFtVWx2n56w6HkM0000000000",
      "id": "550e8400-e29b-41d4-a716-446655440000",
      "preset_id": "650e8400-e29b-41d4-a716-446655440001",
      "system_prompt": "You are a helpful assistant.",
      "updated_at": "2026-04-20T10:00:00Z",
      "version": 1
    },
    "designated_version_id": "550e8400-e29b-41d4-a716-446655440000",
    "id": "650e8400-e29b-41d4-a716-446655440001",
    "name": "my-preset",
    "slug": "my-preset",
    "status": "active",
    "status_updated_at": null,
    "updated_at": "2026-04-20T10:00:00Z",
    "workspace_id": "750e8400-e29b-41d4-a716-446655440002"
  }
}

Changes

  • 412686c1d2c7Revision changes
    • info

      added armor discriminator mapping keys to the / request property

    • info

      added to the / request property oneOf list

  • a84a82cbcf0bRevision changes
    • breaking

      added the new required request property ////////

    • breaking

      added the new required request property ////////

    • breaking

      the /////// request property type changed from string to object

    • info

      the /////// request property's minLength was decreased from 1 to 0

    • info

      removed the pattern ^[^\n\r]*$ from the request property ///////