OpenAI · LLM API Modelactive

gpt-5.6-luna

gpt-5.6-luna costs $0.20 per 1M input tokens, $0.02 cached input and $1.20 per 1M output tokens. Batch API: $0.10 input, $0.60 output.

Updated September 21, 2026
Input / 1M
$0.20
Output / 1M
$1.20
Cached Input
$0.02
Context Window
922K
Standard Input
$0.20 / 1M
Base prompt input rate
Standard Output
$1.20 / 1M
Completion output rate
Prompt Caching -50%
$0.02 / 1M
Cached prompt context
Batch API -50%
$0.10 / 1M
Asynchronous 24h batch

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All rates listed in USD per 1 Million (1M) tokens unless noted

StandardBatchFlexFast mode
Pricing Metric / Parameter
Standard RATE
(per 1M)
Batch RATE
(per 1M)
Flex RATE
(per 1M)
Fast mode RATE
(per 1M)
Short context input$0.20$0.10$0.10$0.40
Short context cached input$0.02$0.01$0.01$0.04
Short context cache writes$0.25$0.125$0.125$0.50
Short context output$1.20$0.60$0.60$2.40
Long context input$0.40$0.20$0.20$0.80
Long context cached input$0.04$0.02$0.02$0.08
Long context cache writes$0.50$0.25$0.25$1.00
Long context output$1.80$0.90$0.90$3.60

Source: OpenAI official pricing page, verified 2026-09-21. Prices in USD per 1M tokens.

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