Thinking Machines Lab Ships Inkling, a 975-Billion-Parameter Open-Weights Model It Admits Is Not the Strongest

Thinking Machines Lab, the San Francisco startup founded last year by former OpenAI chief technology officer Mira Murati, released its first public model on July 15, a mixture-of-experts (MoE) system called Inkling with fully open weights. The Russian-language AI channel that reported the release and independent coverage agree on the configuration: 975 billion total parameters with 41 billion active per token, a context window of up to one million tokens, and pretraining on 45 trillion tokens spanning text, images, audio and video.

The notable part is what the company concedes. Thinking Machines states plainly that Inkling is not the strongest model available, open or closed, and instead positions it for customization through its Tinker fine-tuning platform, with controllable reasoning effort to trade cost against latency. Reported benchmark figures are respectable rather than category-leading, including 77.6 percent on SWE-bench Verified for software engineering and 91.4 percent on VoiceBench. Those numbers are vendor-reported and await independent reproduction.

The strategic signal outweighs the scores. A United States lab that raised a $2 billion seed at a $10 billion to $12 billion valuation, with Nvidia and Andreessen Horowitz among its backers, is releasing full weights at frontier scale rather than charging for access through an application programming interface (API). That runs against the recent pattern of Western labs closing weights to capture revenue, and it gives enterprises a customizable base model that competes for the same fine-tuning demand Chinese open-weight suppliers have been serving.