GPT-6 Luna
OpenAI · released 22 Sep 2026 · proprietary API
- Lowest input price (2-way tie)
- Largest context window (8-way tie)
- Newest release (3-way tie)
The GPT-6 tier OpenAI positions for focused, high-volume tasks.
Context window
1.05M
1,050,000 tokens
Input price
$0.10
per 1M tokens
Output price
$0.50
per 1M tokens
Blended
$0.20
3:1 in:out mix
Weights
Proprietary
API only
Released
22 Sep 2026
OpenAI
Long-context / tier pricing — >272K input reprices the FULL request at 2x input and cache rates / 1.5x output ($0.20 in / $0.75 out per 1M); cached input $0.01/1M and cache writes $0.125/1M (1.25x uncached input); Batch and Flex 50% of standard, Fast mode 2x; regional processing +10%; max input is 922K of the 1,050K window. Listed prices are the base rate for prompts up to ~200K tokens.
Where it ranks
Of 40 models tracked.
Cost to run
#2
of 40
Input price
#1(tied)
of 40
Context window
#1(tied)
of 40
Compare with
The nearest models by blended cost to run.
Put it to work
Specs from BitByteCore's hand-verified Frontier Ledger (v2026-09-23), this row verified 23 Sep 2026 against OpenAI's official pricing ↗. Model pricing moves fast, so confirm with OpenAI before you rely on a figure.