GPT 5.5 aces 20x20 multiplication that o3 couldn't handle OpenAI's unreleased GPT 5.5 model has successfully performed 20x20 multiplication, a task that the company's previous o3 model failed to complete. The achievement marks a significant advancement in large language model arithmetic capabilities, demonstrating improved reasoning and computational precision over prior iterations. We’ve detected that JavaScript is disabled in this browser. Please enable JavaScript or switch to a supported browser to continue using x.com. You can see a list of supported browsers in our Help Center. Help Center Terms of Service Privacy Policy Cookie Policy Imprint Ads info © 2026 X Corp.