OpenAI debuts its GPT-4.1 flagship AI model

OpenAI has introduced GPT-4.1, a successor to the GPT-4o multimodal artificial intelligence model launched by the company last year. During a livestream on Monday, OpenAI said GPT-4.1 has an even larger context window and is better than GPT-40 in “just about every dimension,” featuring “major gains in coding and instruction following.”

Two smaller model versions are also included in this rollout: a GPT-4.1 Mini model that, like its predecessor, is more affordable for developers to tinker with. There’s also GPT-4.1 Nano, an even more lightweight model that OpenAI said is its “smallest, fastest, and cheapest” one yet. All three models can process up to one million tokens of context, which is made up of the text, images, or videos included in a prompt.

The launch comes as OpenAI plans to phase out its two-year-old GPT-4 model from ChatGPT on April 30th, announcing in a changelog that recent upgrades to GPT‑4o make it a “natural successor” to replace it. GPT-4o, the current default model in ChatGPT, was updated last month to bring new image-generation capabilities to the chatbot, which proved so popular that OpenAI had to limit requests and put access to free ChatGPT accounts on hold to prevent its GPUs from “melting.”

OpenAI is also set to debut the full version of its o3 reasoning model and an o4 mini reasoning model any day now, with references having already been spotted in the latest ChatGPT web release by AI engineer Tibor Blaho.