Thinking Machines has been quiet since Murati left OpenAI to start it, and now we know what nine months bought: Inkling, a mixture-of-experts model with 975 billion total parameters that only lights up about 41 billion for any given token. The lab trained it from scratch on 45 trillion tokens spanning text, image, audio, and video, and it reasons across all four natively. Full weights are on Hugging Face, and it's already fine-tunable on Tinker, the company's own customization platform. The pitch isn't that this is the smartest model out there — the team says plainly it isn't. It's that you can make it yours. Their bet is that enterprises care less about topping a general-purpose leaderboard than about a model they can fine-tune and run cheaply on their own terms. Whether that lands is an open question, but as a Western open-weight release at this scale, it's the most interesting thing to download this week.