ChatGPT's GPT-4 model retires soon - some users can continue to access it

When ChatGPT first gained popularity in 2022, GPT-3.5 was the default model. In March 2023, the more advanced GPT-4 replaced it. Since then, both models have been lapped by a much more capable GPT-4o, which will soon replace GPT-4. On Thursday, OpenAI updated its ChatGPT release notes to announce that GPT-4 was being retired from ChatGPT and fully replaced by GPT-4o starting April 30. In the changelog, OpenAI said that GPT-4o consistently outperformed its predecessor in writing, coding, and STEM in head-to-head evaluations.