Aplomb 1 API: Pricing, Playground & Docs

About Aplomb 1

Answers yes/no, choice, score and tool questions about text, JSON, images, video and audio in up to 1M tokens, and can tell when the input lacks the answer.

Send a state and typed questions to POST /v1/decisions. Answers are probabilities with a confidence value; no text is generated. Billed on input tokens only.

Also known as EmpirioLabs Aplomb 1

classificationcalibrated probabilitiestool selectionabstainlong contextvisionvideoaudio inmultimodal

Aplomb 1 specs

Model ID: aplomb-1
Author: EmpirioLabs
Category: Decision Models
Released: Sep 29, 2026
Context window: 1M tokens
Input: TextImageVideoAudio
Output: Decision
Endpoints: POST/v1/decisionsPOST/v1/chat/completionsPOST/v1/responsesPOST/v1/messagesPOST/v1beta/models/aplomb-1:generateContent
Alternate model IDs: aplombempiriolabs/aplomb-1empiriolabs/aplomb

Aplomb 1 API pricing

Live pay-as-you-go rates from the EmpirioLabs catalog. You are billed only for what you use, with no monthly minimum.

Type

Spec

Rate

Input

per 1M prompt tokens

$0.02

Output

per 1M generated tokens

Free

Compare on the full pricing page

How to call the Aplomb 1 API

Aplomb 1 answers questions about your content through POST /v1/decisions. Send the content in state and your questions in questions with the model id aplomb-1. Each answer returns probabilities and a confidence value instead of generated text. Get an API key from the EmpirioLabs dashboard.

cURL

curl https://api.empiriolabs.ai/v1/decisions \
  -H "Authorization: Bearer $EMPIRIOLABS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "aplomb-1",
    "state": "I was charged twice for my subscription this month. Please refund the duplicate charge today.",
    "questions": {
      "is_urgent": {"type": "noul", "instructions": "Does the customer need a resolution today?"},
      "department": {
        "type": "choice",
        "instructions": "Which team should handle this message?",
        "criteria": {"billing": null, "technical": null, "sales": null}
      }
    }
  }'

Python

import requests

response = requests.post(
    "https://api.empiriolabs.ai/v1/decisions",
    headers={"Authorization": "Bearer YOUR_EMPIRIOLABS_API_KEY"},
    json={
        "model": "aplomb-1",
        "state": "I was charged twice for my subscription this month. Please refund the duplicate charge today.",
        "questions": {
            "is_urgent": {"type": "noul", "instructions": "Does the customer need a resolution today?"},
            "department": {
                "type": "choice",
                "instructions": "Which team should handle this message?",
                "criteria": {"billing": None, "technical": None, "sales": None},
            },
        },
    },
)
answers = response.json()["answers"]
print(answers["is_urgent"]["noul"], answers["department"]["choice"])

Full Aplomb 1 API reference

Aplomb 1 API parameters

Request parameters supported by the Aplomb 1 API on EmpirioLabs. Defaults apply when a field is omitted.

Parameter	Type	Default	Range / values	Description
long_context	enum	fast	fast, full	How a state longer than 131,072 tokens is read: fast (the default) answers in seconds, full reads every token. Shorter states are always read in full.

Good to know

Requests

Send content in state (a string, a JSON object, or an array) and 1 to 128 questions in questions to POST /v1/decisions. Each question is answered on its own, with probabilities and a confidence value. No text is generated. The Decisions API guide documents every question option, and its Chat formats section covers requests through /v1/chat/completions, /v1/responses, /v1/messages and Gemini generateContent.

Question types

noul: yes or no, answered with the probability of yes.
choice: one of 2 to 255 options, answered with the chosen option and the full distribution.
score: 2 to 10 ordered levels, answered with the expected level and the distribution.
tool: which of 1 to 254 function tools to call, with distributions over its enum and boolean arguments.

Not in the state

Add "abstain": true to a noul, choice or score question to let the model say the state does not contain the answer. The answer then includes abstain, the probability of that outcome, and the rest of the answer assumes the state does contain it.

Limits

The state plus the longest question: up to 1,000,000 tokens.
At most 512 evaluated questions per request. A tool question counts as one plus one per enum or boolean argument.
Media: up to 16 images (20 MB each), 8 audio clips (25 MB and 10 minutes each) and 4 videos (100 MB and 10 minutes each), as public HTTPS URLs or inline base64.

Benchmarks

Benchmark results are in the launch post.

Billing

Input tokens only: the state once per request, each question's own text, and each media item's tokens. Output is always zero.

Aplomb 1 API: common questions

How much does the Aplomb 1 API cost?

On EmpirioLabs, Aplomb 1 is billed pay as you go. The live rate card on this page always matches what the API charges.

What is the context window of Aplomb 1?

Aplomb 1 supports a 1M-token context window.

Is the Aplomb 1 API OpenAI-compatible?

Yes. Aplomb 1 serves the OpenAI-compatible Chat Completions API, so existing OpenAI SDKs work by pointing base_url at https://api.empiriolabs.ai/v1 and setting the model id to aplomb-1.

Can I try Aplomb 1 in the browser before integrating?

Yes. The EmpirioLabs playground runs Aplomb 1 in the browser with the same parameters the API exposes, so you can test prompts before writing code.

How do I get a Aplomb 1 API key?

Create an EmpirioLabs account, then generate a key under API Keys in the dashboard. Billing is pay-as-you-go credits, so you only pay for the requests you make.

Aplomb 1 API