GPT-5.5 Pro API Pricing

GPT-5.5 Pro by OpenAI costs $30.00 per million input tokens and $180.00 per million output tokens.

Price verified from OpenAI's pricing page.

Rates and limits

Input / 1M
$30.00
Output / 1M
$180.00
Cached input / 1M
Not listed
Batch discount
50% off
Context window
1.05M tokens
Released
April 2026

Pricing note: Prompts over 272K input tokens are billed at $60 in / $270 out for the whole request. No cached-input discount.

What GPT-5.5 Pro costs per month

Token volume split 3:1 between input and output, with no prompt caching.

Tokens per monthInput / outputStandardBatch API
1M750K / 250K$67.50$33.75
10M7.5M / 2.5M$675.00$337.50
100M75M / 25M$6,750.00$3,375.00
Estimate your own workload with GPT-5.5 Pro

Where to run GPT-5.5 Pro

Prices above are OpenAI's direct rates. Cloud platforms can charge differently; the cloud platform view compares them.

GPT-5.5 Pro pricing FAQ

How much does GPT-5.5 Pro cost per million tokens?

GPT-5.5 Pro costs $30.00 per million input tokens and $180.00 per million output tokens, as listed on OpenAI's pricing page on September 30, 2026.

How much does GPT-5.5 Pro cost for 10 million tokens a month?

About $675.00 a month, assuming 7.5 million input and 2.5 million output tokens with no prompt caching, or $337.50 through the batch API.

What is the context window of GPT-5.5 Pro?

GPT-5.5 Pro accepts up to 1,050,000 tokens of context.

Does GPT-5.5 Pro support prompt caching?

No cached-input price is listed for GPT-5.5 Pro, so repeated prompt prefixes are billed at the standard input rate.

Is there a batch discount for GPT-5.5 Pro?

Yes. Requests sent through the batch API cost 50% less: $15.00 per million input tokens and $90.00 per million output tokens.

Where can I use the GPT-5.5 Pro API?

GPT-5.5 Pro is available through OpenAI API, Azure OpenAI Service, Azure AI Foundry, and OpenRouter.

Compare with other models

Prices shown as input / output per million tokens. All model prices · Side-by-side comparison