GPT-5.6 Luna
GPT-5.6 model optimized for cost-sensitive workloads
GPT-5.6 Luna is OpenAI's fastest and most cost-efficient GPT-5.6 model release, intended for cost-sensitive, high-volume workloads. The API docs list text input/output, image input, reasoning token support, and a 1,050,000-token context window.
Pricing
Model profile · Current snapshot
Input / 1M
$0.20
Output / 1M
$1.20
Blended / 1M
$0.45
Output TPS
166
TTFT (s)
61.63
Model Intelligence
Context window
1,050,000 tokens
Arena ranking
51
Benchmarkable
Yes
Model level
release
Intelligence Index
51.2
Coding Index
71.4
GPQA
0.91
HLE
0.37
SciCode
0.53
LCR
0.74
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