Ollama

Ollama System One Decision API

Ollama's /v1/systemone endpoint (v0.35.0+) for decision models such as Nimble, Tev1, Clef and Clef Flash, returning choices, probabilities and scores instead of text.

Documentation GitHub OpenAPI

Operations 1

POST /v1/systemone Evaluate questions with a decision model #

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OpenAPI Specification

openapi: 3.1.0
info:
  title: Ollama System One Decision API
  version: 0.35.1
  description: 'Ollama /v1/systemone: decision models (Nimble, Tev1, Clef, Clef Flash) return choices,
    probabilities and scores instead of text. Added in v0.35.0; image input for Clef models in v0.35.1.
    Authored by API Evangelist from Ollama release notes, docs and Go wire types; Ollama does not publish
    an OpenAPI for it.'
  x-generated-from: documentation
  x-derived-from:
  - https://github.com/ollama/ollama/releases/tag/v0.35.0
  - https://github.com/ollama/ollama/releases/tag/v0.35.1
  - https://github.com/ollama/ollama/blob/c1c536297f5bdbb3aef028df6f09bf81cf260497/docs/capabilities/decision.mdx
  - https://github.com/ollama/ollama/blob/c1c536297f5bdbb3aef028df6f09bf81cf260497/decision/types.go
  x-ae-authored:
    by: API Evangelist
    date: '2026-10-12'
    source_commit: c1c536297f5bdbb3aef028df6f09bf81cf260497
    method: Field names and types transcribed from decision/types.go (Request, Question, Response, Usage,
      NoulAnswer, ChoiceAnswer, ScoreAnswer); constraints and descriptions from docs/capabilities/decision.mdx.
servers:
- url: http://localhost:11434
tags:
- name: Decision Models
paths:
  /v1/systemone:
    post:
      operationId: systemone
      summary: Evaluate questions with a decision model
      tags:
      - Decision Models
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SystemOneRequest'
      responses:
        '200':
          description: Answers keyed by question id.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SystemOneResponse'
components:
  schemas:
    SystemOneRequest:
      type: object
      required:
      - model
      - state
      - questions
      properties:
        model:
          type: string
          description: Decision model, e.g. nimble, tev1, clef, clef-flash.
        state:
          description: 'Required context: string or structured data.'
        images:
          type: array
          items:
            type: string
            contentEncoding: base64
          description: Base64 PNG/JPEG/WebP (Clef models, v0.35.1+). URLs and data URLs not accepted.
        videos:
          type: array
          items: {}
        questions:
          type: object
          additionalProperties:
            $ref: '#/components/schemas/Question'
        keep_alive:
          description: Ollama duration (string or number).
    Question:
      type: object
      required:
      - type
      - instructions
      properties:
        type:
          type: string
          enum:
          - choice
          - noul
          - score
        instructions:
          description: 'The question: a string or structured data.'
        criteria:
          description: 'choice: 2-26 named options with descriptions; noul: descriptions for "false" and
            "true"; score: 2-10 descriptions ordered lowest to highest.'
    SystemOneResponse:
      type: object
      properties:
        model:
          type: string
        answers:
          type: object
          additionalProperties:
            oneOf:
            - title: NoulAnswer
              type: object
              properties:
                type:
                  type: string
                  const: noul
                noul:
                  type: number
            - title: ChoiceAnswer
              type: object
              properties:
                type:
                  type: string
                  const: choice
                choice:
                  type: string
                probabilities:
                  type: object
                  additionalProperties:
                    type: number
                confidence:
                  type: number
            - title: ScoreAnswer
              type: object
              properties:
                type:
                  type: string
                  const: score
                score:
                  type: number
                legend:
                  type: object
                probabilities:
                  type: object
                  additionalProperties:
                    type: number
                confidence:
                  type: number
        usage:
          type: object
          properties:
            input_tokens:
              type: integer
            output_tokens:
              type: integer
        prompt_eval_cached_count:
          type: integer