GPT-5.6 Luna
GPT-5.6 model optimized for cost-sensitive workloads
A GPT-5.6 model designed for cost-sensitive, high-volume workloads; it supports text output, accepts text and image input, and has configurable reasoning effort.
Pricing
Official site · Nov 2, 2026, 2:10 PM
Input / 1M
$0.20
Output / 1M
$1.20
Cached input / 1M
$0.02
Prompts with more than 272K input tokens are priced at 2x input and 1.5x output for the full request. Cache writes are billed at 1.25x the uncached input token rate.
Official OpenAI model documentation explicitly lists token pricing for GPT-5.6 Luna. Model accepts text and image inputs but pricing section itemizes text tokens; treated as a text pricing finding as requested.
Model Intelligence
Context window
1,050,000 tokens
Arena ranking
25
Benchmarkable
Yes
Model level
release
GPQA
0.91
HLE
0.4
SciCode
0.54
LCR
0.84
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