> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mountsea.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Model Prepare

> Create a session for custom model training

<Info>
  This is **Step 1** of the Custom Model workflow. See the [full workflow guide](/api-reference/suno/customModel) for the complete three-step process.
</Info>

This endpoint creates a session and binds an account. No request body is needed. The returned `sessionId` is used for all subsequent [upload](/api-reference/suno/customModelUpload) and [create](/api-reference/suno/customModelCreate) calls.

<Tip>
  The `sessionId` is the unique identifier for the entire training workflow. Store it safely — you'll need it for every subsequent step.
</Tip>


## OpenAPI

````yaml POST /suno/v2/customModel/prepare
openapi: 3.0.0
info:
  title: Suno AI
  description: API documentation for Suno AI
  version: 1.0.0
  contact: {}
servers:
  - url: https://api.mountsea.ai
    description: API Gateway
security: []
tags:
  - name: suno
    description: ''
paths:
  /suno/v2/customModel/prepare:
    post:
      tags:
        - suno
      summary: prepare custom model session
      description: >-
        Select a custom_model/mixed account and create a session. Returns
        sessionId for subsequent upload and create steps. Poll status with the
        same sessionId after create.
      operationId: ApiPublicController_customModelPrepare
      parameters: []
      responses:
        '201':
          description: ''
      security:
        - bearerAuth: []
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

````