GPT-5.5 Pricing — Token Costs & API Calculator

Official API pricing for GPT-5.5 by OpenAI, with context window, tokenizer details, and a plain-English cost estimate.

Pricing Details

Attribute	Value
Provider	OpenAI
Input cost (per 1M tokens)	$5.00
Output cost (per 1M tokens)	$30.00
Long-context rate (prompts over 272K tokens)	$10.00 input / $45.00 output per 1M
Context caching	Yes — 90% off input tokens
Batch API discount	50% off
Context window	1.1M tokens
Tokenizer	o200k_base (GPT-4o / o-series)
Thinking / reasoning	Yes — billed as additional output tokens (est. 3× multiplier)

1,000 requests × 500 input tokens × 200 output tokens costs $8.50/month with GPT-5.5 at OpenAI's published rates.

Based on $5/1M input tokens and $30/1M output tokens.