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Another interesting tweet[1] I saw today shows how you can ask ChatGPT to compress text and it invents it's own (effective!) shorthand.

I bet it's related somehow to glitch tokens and the way GPT is grouping tokens internally.

I experimented with something similar previously and it doesn’t really work. It usually can’t decompress it properly

The example given is obviously gpt's own generation. It might not be expected to roundtrip arbitrary text.