Mixed feelings about this: clearly this is meant to match one of the killer features of Claude. I like using Claude, and I'm also a big supporter of Anthropic - not just because it's an underdog, but due to its responsible and ethical corporate governance model[1], which stands in stark contrast to OpenAI. It's worrying to see ChatGPT close one of the gaps between it and Claude.
[1] https://www.anthropic.com/news/the-long-term-benefit-trust