GPT-5.6 Luna
Model at OpenAI
The basics
As of Nov 1- Status
- Price
- Context
- Open weights
Updates
Role
General-purpose model at OpenAI
Sep 2026 to now · 2 months
Jul 2026 to Sep 2026 · 2 months
Works with
From recorded changes
App · 1 shared change
Agent · 1 shared change
Similar models
Model
$4 in, $20 out
$2 in, $12 out
Cost vs peers
Cheapest of 5 similar models by output price.
Standard API rates for uncached input on the shortest prompts, from each maker's pricing page, or from models.dev for models not researched here yet.
Where it works
Prices and uptime are OpenRouter's figures for each provider's cheapest endpoint. Uptime covers the last 24 hours.
Benchmarks
Higher is better. Green is GPT-5.6 Luna. Dark marks are similar models.
Independent
What people say
Reviews
Incidents
Incidents per week, last 13 weeks. Most in one week: 1.
Writing habits
Creative writing · EQ-Bench, among 51 models tracked here
Slop score
11.8
Overused AI words and phrases. Less slop than 68% of tracked models.
Repetition
4
Repeated words and ideas. Less repetition than 38% of tracked models.
Story length
7,927
Average characters per story. Longer than 80% of tracked models.