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

# Create Thread

> Create a playground thread owned by the authenticated caller.



## OpenAPI

````yaml /api/openapi.json post /v1/playground/threads
openapi: 3.1.0
info:
  title: MeshAPI
  description: One key, all AI models.
  version: 0.1.0
servers:
  - url: https://api.meshapi.ai
security:
  - BearerAuth: []
paths:
  /v1/playground/threads:
    post:
      tags:
        - Playground
      summary: Create Thread
      description: Create a playground thread owned by the authenticated caller.
      operationId: create_thread
      parameters:
        - in: header
          name: X-Mesh-Version
          required: false
          schema:
            type: string
            enum:
              - 2026-08
            default: 2026-08
          example: 2026-08
          description: >-
            Dated version of the API contract to pin this request to. Omit it
            and the request is served under `2026-08` — the oldest supported
            version, so an existing integration is never moved by a release. A
            malformed or unsupported value is rejected with `400
            invalid_api_version` rather than falling back silently. The version
            actually served is echoed as `X-Mesh-Version` on every response,
            including errors.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateThreadRequest'
      responses:
        '201':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Thread'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      security:
        - BearerAuth: []
components:
  schemas:
    CreateThreadRequest:
      properties:
        title:
          anyOf:
            - type: string
              maxLength: 200
            - type: 'null'
          title: Title
        surface:
          type: string
          title: Surface
          default: chat
        model:
          anyOf:
            - type: string
            - type: 'null'
          title: Model
        params:
          anyOf:
            - additionalProperties: true
              type: object
            - type: 'null'
          title: Params
        messages:
          anyOf:
            - items:
                additionalProperties: true
                type: object
              type: array
            - type: 'null'
          title: Messages
        team_id:
          anyOf:
            - type: string
            - type: 'null'
          title: Team Id
      type: object
      title: CreateThreadRequest
      example:
        messages:
          - content: Explain the CAP theorem.
            role: user
        model: anthropic/claude-sonnet-4.5
        params:
          temperature: 0.7
        surface: chat
        title: CAP theorem explainer
    Thread:
      properties:
        id:
          type: string
          title: Id
        title:
          anyOf:
            - type: string
            - type: 'null'
          title: Title
        surface:
          type: string
          title: Surface
        model:
          anyOf:
            - type: string
            - type: 'null'
          title: Model
        params:
          anyOf:
            - additionalProperties: true
              type: object
            - type: 'null'
          title: Params
        messages:
          items:
            additionalProperties: true
            type: object
          type: array
          title: Messages
        org_id:
          anyOf:
            - type: string
            - type: 'null'
          title: Org Id
        team_id:
          anyOf:
            - type: string
            - type: 'null'
          title: Team Id
        created_at:
          type: string
          title: Created At
        updated_at:
          type: string
          title: Updated At
      type: object
      required:
        - id
        - title
        - surface
        - model
        - params
        - messages
        - org_id
        - team_id
        - created_at
        - updated_at
      title: Thread
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: >-
        Enter your MeshAPI key (`rsk_...`) — sent as `Authorization: Bearer
        <key>`.

````