GPT-5.6 Is Last in 5.x Line, GPT-6 Coming in About a Month
The Neuron
OpenAI will release GPT-6 in approximately one month, replacing the 5.x model line with a substantially larger pretraining dataset designed to compete with Anthropic's Fable models. GPT-5.6 marks the final update in the current generation. The shift indicates OpenAI is advancing its development cycle to maintain competitive positioning against rival AI labs.
Why it matters
GPT-5.6 will be OpenAI's last release in the 5.x line, with GPT-6 landing in about a month built on a noticeably bigger pretrain to compete with Anthropic's Fable 5 and upcoming Fable 5.1.
