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

# Get v1trainingsessions



## OpenAPI

````yaml /openapi.yaml get /v1/training/sessions/{session_id}
openapi: 3.1.0
info:
  title: Whitney Training API
  version: 0.3.0
  description: >
    Public HTTP API for caller-owned model training on Whitney.


    Authenticate with a Whitney API key (`whitney_test_…` or `whitney_live_…`).

    Create a session and run, submit ordered training and sampling primitives,

    poll durable operations, and retrieve checkpoints, artifacts, usage, and
    cost.


    Every public request uses typed JSON. Token IDs and dense tensor values are

    ordinary JSON arrays validated against strict, provider-neutral schemas.
servers:
  - url: http://localhost:3001
    description: Local API
  - url: https://api.staging.trywhitney.com
    description: Staging API
  - url: https://api.trywhitney.com
    description: Production API
security:
  - WhitneyApiKey: []
tags:
  - name: unified-training
    description: Whitney-owned session, primitive, and operations API.
paths:
  /v1/training/sessions/{session_id}:
    parameters:
      - $ref: '#/components/parameters/SessionId'
    get:
      tags:
        - unified-training
      operationId: getTrainingSession
      responses:
        '200':
          description: The durable session state.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Session'
        default:
          $ref: '#/components/responses/ApiError'
components:
  parameters:
    SessionId:
      name: session_id
      in: path
      required: true
      schema:
        $ref: '#/components/schemas/SessionId'
  schemas:
    Session:
      type: object
      additionalProperties: false
      required:
        - id
        - status
        - provider
        - funding_source
        - lease_epoch
        - lease_expires_at
        - max_cost_microusd
        - error_code
        - capability
        - capability_snapshot
        - created_at
        - updated_at
      properties:
        id:
          $ref: '#/components/schemas/SessionId'
        status:
          type: string
          enum:
            - provisioning
            - ready
            - failed
            - closing
            - closed
            - interrupted
            - timed_out
        provider:
          type: string
          enum:
            - modal
            - tinker
        funding_source:
          type: string
          enum:
            - platform
            - byok
        lease_epoch:
          type: integer
          minimum: 0
        lease_expires_at:
          $ref: '#/components/schemas/Timestamp'
        max_cost_microusd:
          type:
            - integer
            - 'null'
        error_code:
          type:
            - string
            - 'null'
        capability:
          $ref: '#/components/schemas/CapabilitySnapshot'
        capability_snapshot:
          $ref: '#/components/schemas/CapabilitySnapshot'
        created_at:
          $ref: '#/components/schemas/Timestamp'
        updated_at:
          $ref: '#/components/schemas/Timestamp'
    SessionId:
      type: string
      pattern: ^wts_[0-9a-f]{32}$
    Timestamp:
      type: string
      format: date-time
    CapabilitySnapshot:
      type: object
      additionalProperties: false
      required:
        - provider
        - models
        - operations
        - sampler_operations
        - resource_profiles
        - billing_snapshot
      properties:
        provider:
          type: string
          enum:
            - modal
            - tinker
        models:
          type: array
          items:
            type: string
        operations:
          type: array
          items:
            type: string
        sampler_operations:
          type: array
          items:
            type: string
        resource_profiles:
          type: object
          additionalProperties:
            type: object
            additionalProperties:
              type: string
        billing_snapshot:
          type: object
          description: >-
            Immutable provider pricing and conservative spend-guard inputs
            frozen at session creation.
          additionalProperties: true
    ErrorResponse:
      type: object
      additionalProperties: false
      required:
        - error
      properties:
        error:
          type: object
          additionalProperties: false
          required:
            - code
            - message
          properties:
            code:
              type: string
            message:
              type: string
        request_id:
          type: string
        funding_source:
          type: string
          enum:
            - platform
            - byok
  responses:
    ApiError:
      description: Whitney API error envelope.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    WhitneyApiKey:
      type: http
      scheme: bearer
      bearerFormat: whitney_test_|whitney_live_
      description: Whitney-issued API key. No organization-selection header is accepted.

````