OpenAI released the latest GPT-5.5 model last month with the company claiming improvements in areas like coding and knowledge work.
The new model also achieved a score of 81.2 in the AIME 2025 math test, compared to 65.4 for the older model. It also outperformed its predecessor on the MMMU-Pro multimodal reasoning benchmark, with a score of 76 vs. 69.2.