OpenAI is dropping several older AI models from ChatGPT on February 13, 2026: GPT-4o, GPT-4.1, GPT-4.1 mini, and o4-mini. The models will stick around in the API for now. The company says it comes down to usage: only 0.1 percent of users still pick GPT-4o on any given day.

There's a reason OpenAI is being so careful about GPT-4o specifically: the model has a complicated past. OpenAI already killed it once back in August 2025, only to bring it back for paying subscribers after users pushed back hard. Some people had grown genuinely attached to the model, which was known for its complacent, people-pleasing communication style. OpenAI addresses this head-on at the end of the post:

We know that losing access to GPT‑4o will feel frustrating for some users, and we didn’t make this decision lightly. Retiring models is never easy, but it allows us to focus on improving the models most people use today.

OpenAI

OpenAI points to GPT-5.1 and GPT-5.2 as improved successors that incorporate feedback from GPT-4o users. People can now tweak ChatGPT's tone and style, things like warmth and enthusiasm. But that probably won't be enough for the GPT-4o faithful.

OpenAI uses a "special version" of ChatGPT to track down internal information leaks. That's according to a report from The Information, citing a person familiar with the matter. When a news article about internal operations surfaces, OpenAI's security team feeds the text into this custom ChatGPT version, which has access to internal documents as well as employees' Slack and email messages.

The system then suggests possible sources of the leak by identifying files or communication channels that contain the published information and showing who had access to them. It's unclear whether OpenAI has actually caught anyone using this method.

What exactly makes this version special isn't known, but there's a clue: OpenAI engineers recently presented the architecture of an internal AI agent that could serve this purpose. It's designed to let employees run complex data analysis using natural language and has access to institutional knowledge stored in Slack messages, Google Docs, and more.