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It’s still rendering frames constantly, no? So it just figures the next X frames are all doing nothing?
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Normal only keypresses invoke the next ”frame”. There is a sleep token that the runner could use to indicate that time is moving.
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from the post:

Time is an input too. If nothing is pressed, the model gets a WAIT token with a duration instead of a key, which is how snake keeps moving on its own.

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That seems as likely as anything, but that just moves the problem to counting, doesn't it? The model gets the duration, but I was under the impression LLMs struggled with the arithmetic that would make that useful.
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Idk about Qwen 2.5 Coder that this is based on, but modern models don't struggle with arithmetic. I see Qwen 3.8 do long-hand math in thinking traces (ie. it outputs 17+35+12=64 in the thinking trace) so I would imagine this is something they train into the model specifically. Sometimes it creates and runs a simple python script to check its work.
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It's still strange to me that an ability to perform arithmetic (and not just memorize a giant table of results) could emerge from training on language.
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In principle a large enough neural network can provably approximate any continuous function. Since arithmetic can be represented with a concrete grammar, it's not surprising to me that an LLM could contain an abstract representation if trained correctly.
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