open weights — A model whose trained parameters are published for anyone to download and run — unlike API-only models you can access but never possess.
multimodal — A model that works with more than text — reading images, audio, or video, and sometimes generating them too.
fine-tuning — Taking a trained model and training it a bit more on your own examples so it gets better at one specific job.
Why it matters
Thinking Machines' first production model ships open weightsA model whose trained parameters are published for anyone to download and run — unlike API-only models you can access but never possess.Full definition →, multimodalA model that works with more than text — reading images, audio, or video, and sometimes generating them too.Full definition → and ready to fine-tuningTaking a trained model and training it a bit more on your own examples so it gets better at one specific job.Full definition → through Tinker — a serious tunable base for teams who would rather adapt a model than rent a closed one.
