OpenAI launched GPT-5.6 with three model tiers and 54% better token efficiency, directly addressing enterprise complaints about high AI inference costs.

OpenAI unveiled GPT-5.6 at the end of June, but the public release was held back while the U.S. government reviewed...

OpenAI's GPT-5.6 model family launches with US government oversight as senior researcher Noam Brown compares its capabilities to human research interns.