Source: OpenAI is preparing to launch GPT-5.4, which will feature an "extreme" reasoning mode and a context window of 1M tokens, up from 400K in GPT-5.2 (Stephanie Palazzolo/The Information)

Stephanie Palazzolo / The Information: Source: OpenAI is preparing to launch GPT-5.4, which will feature an“extreme” reasoning mode and a context window of 1M tokens, up from 400K in GPT-5.2  —  OpenAI's next GPT model is coming—and soon, according to a person with knowledge of it.