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Just get to the point: teaching Thinking Machines' 1T Inkling model dad jokes with GRPO on Tinker

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A GRPO recipe study on Tinker: seven reward designs, one blind-taste-testing dad, and an eval that got audited as hard as the model.

A field report · Tinker + Inkling · GRPO Teaching the new 1T-parameter Inkling model from Thinking Machines the art of the dad joke, and what it actually learned. One joke setup, three answers A dad-joke setup — what do you call a fake noodle? — answered three ways: the canon (the classic) takes the shortest, straightest path to "Impasta!", the tuned model curves up to "Faux-tie!", and the base model wanders down a long wavy path, trailing off without ever landing the joke. What do you call a fake noodle? Canon (the classic) “Impasta!” PunTune “Faux-tie!” Base model “See, it's this…

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