OpenAI releases GPT-5.5 and GPT-5.5 Pro in the API

DeepSeek-V4 arrives with near state-of-the-art intelligence at 1/6th the cost of Opus 4.7, GPT-5.5

GPT-5.5: Mythos-Like Hacking, Open to All

OpenAI's GPT-5.5 is here, and it's no potato: narrowly beats Anthropic's Claude Mythos Preview on Terminal-Bench 2.0