Text generation / OpenAI

gpt-5.6-luna

StreamFunction callingStructured outputs

Overview

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for its price tier.

Model type: Text generation
Input: Text / Image
Output: Text
Endpoints: chat / chat_completion

Tiered billing details

Tier	Input	Output	Cache hit	Cache write
≤272K input tokens	$0.0002/1K	$0.0012/1K	$0.0000/1K	$0.0003/1K
>272K input tokens	$0.0004/1K	$0.0018/1K	$0.0000/1K	$0.0005/1K

Billed bylen (input context token count). Coefficient is the $ / 1M tokens price. Default group price (other groups converted by discount).

Code example

Call with gpt-5.6-luna :

curl https://www.starunion.net/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-luna",
    "messages": [{ "role": "user", "content": "Hello" }]
  }'