# GPT-6 Luna Decisions

> GPT-6 Luna Decisions is GPT-6 Luna served through OpenAI's Decisions API. Send application state and typed questions (noul / choice / score) and get back a probability, a choice from a fixed set, or a rubric score for each question, not generated chat text, so it produces no output tokens. It has a 1,050,000-token context window. Call POST /api/v1/decisions (POST /api/v1/systemone is the same handler).

**ID**: `openai/gpt-6-luna-decisions`  
**Creator**: OpenAI  
**Category**: text  
**Context**: 1.1M tokens  
**Pricing**: $0.10 / $0 per 1M · billed by your provider (BYOK)  
**Released**: 2026-10-06  
**Web page**: https://anyrouter.dev/model/openai/gpt-6-luna-decisions

**Input modalities**: text  
**Output modalities**: text  

**Capabilities**: systemone

**Supported parameters**: state, model, questions

**Aliases**: `openai/decisions`

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/decisions`

```bash
curl https://anyrouter.dev/api/v1/decisions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "state": "Help! My payouts have been failing for 3 days.",
  "model": "openai/gpt-6-luna-decisions",
  "questions": {
    "is_urgent": {
      "type": "noul",
      "instructions": "Does this convey urgency?"
    }
  }
}'
```

Decisions is not chat: send `state` and typed `questions` (noul / choice / score). Requires a BYOK key for TypeSafe, LLM Gateway, Vercel AI Gateway, AIHubMix, AutoJev, or Fastino.

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| openrouter-byok | $0.10/M (list) | $0 (list) |

BYOK routes are billed by your own provider key — AnyRouter charges $0. Rates marked (list) are the provider's published list price.

## Model card

- Native context: 1050000 tokens [2]

### Strengths [1]

- Returns a probability, a choice or a rubric score for each typed question in one pass
- Several questions per request on shared evidence, with prompt caching for repeated input
- Roughly 10x faster than the Responses API for classification and routing

### Known limits [1]

- Gives answers only, with no written rationale
- GPT-6 Luna is the only model the Decisions API supports

### Use cases [1]

- Classifying and routing tickets, messages and requests
- Gates and filters before a workflow continues
- Scoring content against a rubric

### API notes [1]

- Request has a model, shared input (text, messages or JSON) and named typed questions
- Answers come back keyed by question name, with token usage

### Links

- docs: https://developers.openai.com/api/docs/guides/decisions

### Sources

1. [Decisions](https://developers.openai.com/api/docs/guides/decisions) (accessed 2026-10-29)
2. [Decisions - Cloudflare Workers AI](https://developers.cloudflare.com/ai/models/openai/decisions/) (accessed 2026-10-29)

## Source

- Upstream docs: https://developers.openai.com/api/docs/guides/decisions