OpenAI Joins Open-Weight AI Coalition as Anthropic Stays Off the List

- OpenAI joined the open-weight AI letter, while Anthropic remains absent from the list.
- Anthropic leads Ramp business adoption, while OpenAI holds the stronger consumer reach.
- Model launches, safety policies and IPO plans deepen the fierce OpenAI-Anthropic rivalry.
OpenAI has joined an industry coalition supporting open-weight AI. Anthropic does not appear on the current signatory list. Their rivalry already spans products, business adoption, financing and safety policy.
A July 24 industry letter urged US policymakers to avoid premature restrictions on open-weight AI. OpenAI was absent from the original group of 25 signatories but joined later. Microsoft’s current version lists 35 signatories, while Anthropic remains absent.
In an X post, OpenAI CEO Sam Altman backed US leadership in both open-source and proprietary AI. Several users welcomed OpenAI’s signatu…
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