OpenAI · LLM API Modelactive

gpt-5.5

gpt-5.5 costs $5.00 per 1M input tokens, $0.50 cached input and $30.00 per 1M output tokens. Batch API: $2.50 input, $15.00 output.

Updated September 21, 2026
Input / 1M
$5.00
Output / 1M
$30.00
Cached Input
$0.50
Context Window
1.05M
Standard Input
$5.00 / 1M
Base prompt input rate
Standard Output
$30.00 / 1M
Completion output rate
Prompt Caching -50%
$0.50 / 1M
Cached prompt context
Batch API -50%
$2.50 / 1M
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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$5.00$2.50$2.50$12.50
Short context cached input$0.50$0.25$0.25$1.25
Short context cache writes----
Short context output$30.00$15.00$15.00$75.00
Long context input$10.00$5.00$5.00-
Long context cached input$1.00$0.50$0.50-
Long context cache writes----
Long context output$45.00$22.50$22.50-

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

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