GPT-5.6 Luna

Name: GPT-5.6 Luna
Brand: OpenAI
Price: 1.2 USD

latest OpenAI

Verified 2026-09-03 against the pages listed below. Prices are USD per 1M tokens, list rate — no committed-use, enterprise or volume discount.

Input

$0.2

Cached input

$0.02

Cache write

$0.25

Output

$1.20

Context window

1,050,000

Max output

128,000

Weights

closed

Caching

automatic

down 80% from the $1.00/$0.10/$6.00 this board recorded on 2026-07-30; the long-context tier is $0.40/$0.04/$0.50/$1.80. The page names a 272K threshold for gpt-5.5/5.4 but not for the 5.6 series

cached input at 10% of base

Watch out

An 80% cut drops a frontier lab into open-model pricing — re-derive any routing rule that sends bulk work elsewhere on price alone

What we would use it for

High-volume work that still needs vision and tools

What this has cost, week by week

Output price at each refresh since 2026-07-30. A vendor change is the provider changing its price. Our correction means this board changed what it prints and the provider's charge did not move — the two are never merged, because publishing the second as the first would be a price rise that never happened.

07-30 $6.00→08-06 $1.20→08-14 $1.20→08-20 $1.20→08-27 $1.20→09-03 $1.20

vendor change2026-08-06 · in, cached_in, out — OpenAI cut Luna by 80%, effective 2026-07-30: $1.00/$0.10/$6.00 to $0.20/$0.02/$1.20.

our correction2026-08-06 · cache_write — The pricing page had stated this rate all along and the board carried it as null. OpenAI disclosed nothing new; we filled a gap of our own making.

Where these numbers came from

No number on this page was written that was not read from one of those pages on 2026-09-03. If one is wrong, send us the source URL and it is corrected in the next weekly refresh, with a changelog line saying what was wrong — contact@naderu.com.

Jobs this is one of our picks for

Chat assistant — Multi-turn conversation, the ordinary case (chat-assistant)
Document understanding — OCR, scans, charts and forms (document-understanding)
Copy editing — Rewrite for grammar, tone and house style (copy-editing)

Discussed in Naderu Weekly

The weights aren't the whole model — 2026-08-20
The clock is now part of the bill — 2026-08-14

The rest of the board

This row sits alongside 53 others on the model board, refreshed every week. The same data as JSON, and the terms for using it, are at /board-data.