GPT-5.5 is priced at $5/1M input tokens and $30/1M output tokens, double GPT-5.4's pricing; GPT-5.5 Pro costs $30/1M input tokens and $180/1M output tokens
$5 per mil in, $30 per mil out. GPT-5.5 is smart. I've been using it for a bit. It's also weird, hard to wrangle, and too expensive IMO. Double the price of GPT-5.4. 20% more expensive than Opus 4.7.