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Interesting. They switched to a new tokenizer for 4o and 4o-mini, so this might have the same issue.

I noticed the same problem but on 4, it was super-weird, everything was fine except one character, and it occurred consistently in the second and the next answers, never in the first one.

i saw this with github copilot a few days ago, not sure which model it was. it messed up a single character of markup causing the resulting output to be formatted weirdly