Ordinal

Which model is worth using

1 Oct 2026

OpenAI

GPT-6 Luna

The cheap end of GPT-6. Fast, and not a substitute for Sol or Opus.

32Index · High
$0.03Per measured task
1067 pts/$Points / $
123Tokens / sec

Every published effort

SettingIndexPer taskTokens / sec
Max37$0.07127
Extra high34$0.04131
High32$0.03123
Medium29$0.02—
Low21$0.0045134

What this workload costs

List price for one call. Reasoning tokens count as output. A cache hit uses the lab’s cache rate when one is published.

GPT-6 Luna
Cache applied
$0.0031

Specs

API id
gpt-6-luna
Released
22 Sep 2026
Context
1M
Max output
—
Input / 1M
$0.10
Output / 1M
$0.50
Cache read / 1M
$0.01
Knowledge
—
Inputs
Text
Weights
Closed

OpenAI's volume model. Above 272k input tokens the whole request is repriced. Context figure is the 1M listed by Artificial Analysis.

Vision is not confirmed on the sources used for this card.

Use it when

Classification, extraction, routing, and other calls you make millions of. Max effort reaches 37 on the index for about $0.07 a measured task.

Leave it when

Frontier coding or long agent work. Luna is a different product from Sol.

Sources