On Open Weights and American AI Leadership

On the 24th, Microsoft published a letter called Open Weights and American AI Leadership and currently fifty tech companies have signed it. The gist is, they want “open weight” AI models to be treated as a pillar of American national security.

It is a masterclass in conflation.

The letter spends paragraphs praising open source software. Linux. The internet. Scientific research. Then it pivots.. to Open weight, not Open Source. Open weight models are framed as the natural successor to the Open Source tradition. They are not.

Open source means getting the recipe. The compiler flags. The training data provenance. The bug tracker. It can be studied, modified, and rebuilt from first principles. Open weights means receiving a forty billion parameter binary blob and being wished luck. It is the difference between a cookbook and a frozen dinner. Both involve food. Only one allows the recipe to be changed.

The signatories know this. Most of them do not open source their frontier models. Most of them don’t actually open source anything at all. Imagine NVIDIA open sourcing CUDA and GPU drivers? Yeah. So they want to release model weights. Or they release nothing at all and rent API access by the token. Calling a weight dump “open” is like calling a PDF “open source” because it can be read with a magnifying glass.

The geopolitical framing is equally convenient. The letter warns that restricting open weights will “drive innovation overseas.” Non American models are treated as a looming threat. American models, meanwhile, are framed as the safe, sovereign choice. This from the same companies that store customer data in Dublin, train models in Singapore, and source chips from Taiwan. Sovereignty is a flexible concept when it serves the bottom line.

What makes the posturing absurd is the timing. The AI frontier has been recast as a Cold War race. Congress is drafting bills. Export controls are expanding. Billions in defense contracts are being negotiated. All for a technology whose primary consumer use cases remain autocomplete, chatbots, and generating images of astronauts on horseback. The industrial applications are promising. They are also mostly theoretical. The geopolitical architecture is being built before the building has a purpose.

The most cynical move is the compute shift. The letter celebrates open weights because they let organizations “run on their own infrastructure.” This sounds like empowerment. It is actually a capital expenditure transfer. Training a frontier model costs hundreds of millions. Running it at scale requires a data centers full of GPUs. The signatories are not offering to build those data centers. They are offering a file download that forces the recipient to build (or buy) their own compute. Big tech keeps the training revenue, the cloud rental revenue, and the chip partnerships. The consumer gets the electricity bill and the cooling problem.

This is not open source. It is open cost.

The letter ends with a flourish about “American technological leadership” and “shared prosperity.” Shared by whom is the question. The signatories include the same half dozen companies that control every layer of the stack (yeah and ok, DoorDash, apparently for some reason). Chips. Cloud. Models. Distribution. They are not asking for an open ecosystem. They are asking for regulatory cover to keep selling binary blobs while the rest of the country buys the hardware to run them.

Open source lowered barriers. Open weights shift them. Open weights are a good thing, but I doubt this play is done with good, open intentions.

I guess time will have to prove me wrong. Maybe it does.