openapi: 3.0.1
info:
  title: SUTRA Chat Models API
  description: OpenAI-compatible REST API for the SUTRA family of multilingual large language models from Two AI (Numeric). The SUTRA-V2 model handles instruction-following and conversational tasks across 50+ languages, and the SUTRA-R0 model provides advanced multi-step reasoning. The same chat/completions endpoint serves both models. The documented base URL is https://api.numeric.tech/v2 and is also reachable as https://api.two.ai/v2; the OpenAI SDK can be pointed at this base_url directly.
  termsOfService: https://www.two.ai
  contact:
    name: Two AI (Numeric)
    url: https://docs.two.ai/docs
  version: '2.0'
servers:
- url: https://api.two.ai/v2
  description: SUTRA API (two.ai)
- url: https://api.numeric.tech/v2
  description: SUTRA API (documented Numeric host)
security:
- bearerAuth: []
tags:
- name: Models
  description: List available SUTRA models.
paths:
  /models:
    get:
      operationId: listModels
      tags:
      - Models
      summary: List models
      description: Lists the SUTRA models currently available to the authenticated account, following the OpenAI models list shape.
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListModelsResponse'
        '401':
          description: Unauthorized - missing or invalid API key.
components:
  schemas:
    Model:
      type: object
      properties:
        id:
          type: string
          example: sutra-v2
        object:
          type: string
          example: model
        created:
          type: integer
          format: int64
        owned_by:
          type: string
          example: two-ai
    ListModelsResponse:
      type: object
      properties:
        object:
          type: string
          example: list
        data:
          type: array
          items:
            $ref: '#/components/schemas/Model'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Provide your SUTRA API key as a Bearer token in the Authorization header - Authorization: Bearer <YOUR_SUTRA_API_KEY>.'