GPT-5.5 API Pricing
Short answer
GPT-5.5 costs $5.00 per 1M input tokens and $30.00 per 1M output tokens (cached input $0.50/1M). Context window: 1,050,000. Last verified 2026-06-17 from learn.microsoft.com. Confidence: Verified.
GPT-5.5 is OpenAI's flagship API model for frontier coding and reasoning, available on the official API, Azure, and OpenRouter.
Input
$5.00 /1M
Output
$30.00 /1M
Cached input
$0.50 /1M
Input pricing$5.00
Cached input$0.50
Output pricing$30.00
Limits & capabilities
Context window1,050,000
Max output128K
Modalitytext + image input, text output
ChannelAzure OpenAI
ProviderOpenAI
Best for
ReasoningCodingAgentic
GA on Microsoft Foundry; token prices match the direct API. Effective cost varies by deployment type and region; data-residency endpoints add ~10%. Prompts over 272K tokens bill ~2x input / 1.5x output for the session. Cached input is 90% off standard input.
Last checked Verified
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