Opencode also has that feature, I've seen it multiple times in the last days (mostly using Opus 4.5/4.6/Gemini 3)
Indeed, Opencode has it too. They've been improving it the past few weeks to look more like the one in Claude-Code. I disable it all the time though, I find it such a pain (in both Claude-Code and OpenCode)
Interesting. I wonder if it's just a matter of prompting properly or if GPT/GLM just doesn't have that training.