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GPT-5.6 Luna

OpenAI · released 9 Jul 2026 · proprietary API

Fastest, lowest-cost GPT-5.6 tier for high-volume work.

Context window

1.05M

1,050,000 tokens

Input price

$0.20

per 1M tokens

Output price

$1.20

per 1M tokens

Blended

$0.45

3:1 in:out mix

Weights

Proprietary

API only

Released

9 Jul 2026

OpenAI

Long-context / tier pricing — >272K input billed at the long-context tier ($0.40 in / $1.80 out per 1M); cached input $0.04/1M. Listed prices are the base rate for prompts up to ~200K tokens.

Where it ranks

Of 42 models tracked.

Cost to run

#8

of 42

Input price

#7(tied)

of 42

Context window

#1(tied)

of 42

See the full Frontier Index →

Compare with

The nearest models by blended cost to run.

Put it to work

Specs from BitByteCore's hand-verified Frontier Ledger (v2026-10-01), this row verified 3 Sep 2026 against OpenAI's official pricing ↗. Model pricing moves fast, so confirm with OpenAI before you rely on a figure.