OpenAI releases GPT-5.5, a more powerful engine for coding, science, and general work

OpenAI on Thursday released its most capable AI system, GPT-5.5, which the company says will enable a more powerful Codex coding agent. OpenAI is quick to say, however, that GPT-5.5 will power the widening set of general digital work tasks that Codex is capable of. The system is significantly better than previous releases at helping with scientific work, including creative aspects of generating new hypotheses and testing them. 

The system represents an improvement in autonomous or agentic capability.