#gpt-4o

Together Research said on March 27, 2026 that a smaller model using divide-and-conquer can match or outperform GPT-4o on long-context tasks, with the work accepted at ICLR 2026. Together's blog and the arXiv paper say the method uses a planner-worker-manager pipeline and explains long-context failures in terms of task, model, and aggregator noise.

OpenAI said on January 29, 2026 that ChatGPT would stop offering GPT-4o and older model options from February 13, 2026. GPT-4o, GPT-4.5, and o4-mini are being replaced by GPT-5, GPT-5 thinking, and o5-mini respectively.