230+ Tech Giants Sign Open Letter Supporting Open-Weight AI

More than 230 tech companies and organizations have co-signed an open letter titled "Open Weights and US AI Leadership," urging the integration of open weights as a core component of the US AI strategy. Nvidia CEO Jensen Huang published his first-ever personal tweet in support, stating that the move is crucial for safety and sovereignty. Notably, among leading AI companies, only Anthropic declined to sign, highlighting the ongoing industry divide between open-source and closed-source approaches.

Confirmed

Over 230 companies and organizations, including Nvidia, Microsoft, Meta, OpenAI, Google, a16z, Palantir, Coinbase, and Anaconda, have signed the open letter supporting "Open Weights and US AI Leadership."
Nvidia CEO Jensen Huang posted the first tweet on his personal X account, signing and publicly endorsing the letter, emphasizing that open weights are vital for safety and sovereignty.
Microsoft Vice Chair and President Brad Smith published a post confirming Microsoft's participation and specifically thanked Nvidia, a16z, and Palantir.
The CEO of Coinbase announced joining the signature, stating that building open, permissionless systems is crucial for the future of AI.
Anaconda published a post in support, pointing out that using closed-source models incurs continuous costs per API call for enterprises, whereas open source can transform AI into infrastructure.

Unconfirmed

Posts from various parties show dynamic discrepancies in the total count of co-signing companies, ranging from the initial 25, to over 70, and now over 230. For the exact latest figure, please refer to the official real-time statistics of the open letter.

Why It Matters

This event marks that the route debate between open-source and closed-source models has evolved into a broader industry trend, reshaping multiple software sectors, including infrastructure.
According to perspectives from @ivanbezdomny and @maierak, open source prevents AI from being monopolized by a few closed-source giants and helps build a decentralized open ecosystem akin to the open-source software movement of the 1980s, thereby prospering the AI economy.

2026-07-29 ~ 2026-07-31 · 10 related posts

Primary sources

Jensen Huang's First X Post Backs Open Weights: A Security and Sovereignty Argument — Castieell99 · 2026-07-31 07:10 (UTC+08:00)
NVIDIA's Open Weights Letter Hits 230 Signatories, Anthropic Remains Sole Holdout — ivan_bezdomny · 2026-07-31 01:33 (UTC+08:00)
NVIDIA and 70 Giants' Open Letter: Open Weights Define US AI Leadership — maier_ak · 2026-07-30 12:30 (UTC+08:00)

A sign-on list spanning OpenAI, Anthropic, Google, Microsoft and Nvidia keeps growing — ccerrato147 · 2026-07-29
Fireworks AI president says open weights should belong to every company — lqiao · 2026-07-29
Nvidia, Meta, and 25 Orgs Urge Washington to Protect Open-Weight AI — anacondainc · 2026-07-30
NVIDIA and 70+ Companies Sign Open Letter Supporting Open-Weight AI Models — NVIDIAAI · 2026-07-30
[source] NVIDIA and 70 Giants' Open Letter: Open Weights Define US AI Leadership — maier_ak · 2026-07-30
Over 230 Companies Sign Open Letter Supporting Open Weights and American AI Leadership, Including Microsoft, Nvidia, a16z — ctnzr · 2026-07-30
[source] NVIDIA's Open Weights Letter Hits 230 Signatories, Anthropic Remains Sole Holdout — ivan_bezdomny · 2026-07-31
Microsoft-led open letter on open weights gains 230+ signatories including Coinbase, NVIDIA, a16z — kleffew94 · 2026-07-31
[source] Jensen Huang's First X Post Backs Open Weights: A Security and Sovereignty Argument — Castieell99 · 2026-07-31

1 near-duplicate retellings: JiaZhihao