GPT-5.6 Luna
OpenAI · released 9 Jul 2026 · proprietary API
- 1.05M context
- Text + image in
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 19 models tracked.
Cost to run
#2
of 19
Input price
#1(tied)
of 19
Context window
#1(tied)
of 19
Compare with
The nearest models by blended cost to run.
Put it to work
Specs from BitByteCore's hand-verified Frontier Ledger (v2026-07-20), this row verified 17 Aug 2026 against OpenAI's official pricing ↗. Model pricing moves fast, so confirm with OpenAI before you rely on a figure.