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Amazon signed the Open Weights and American AI Leadership letter; Matt Garman…

Brief

Amazon signed the Open Weights and American AI Leadership letter; Matt Garman (@mattsgarman) emphasized Amazon has backed open-weight models on Amazon Bedrock since 2023 and will keep advocating open ecosystems. He called open and closed models complementary for access, innovation, and competition. Anthropic remains the last major holdout and posted its POV on 2026-07-27.

Why it matters

Amazon signed the Open Weights and American AI Leadership letter; Matt Garman (@mattsgarman) stated Amazon has supported open-weight models on Amazon Bedrock since 2023 and will continue to advocate for open ecosystems.

Key details

  • Garman argued open and closed models are complementary — no single model will define AI leadership — and said customers need access to frontier closed models alongside open-weight models they can adapt, optimize, and deploy; Amazon supports the letter's 'macro direction' though some elements need further definition.
  • Anthropic is the last remaining major company that has not signed the letter and published its POV on the issue on 2026-07-27.
Cleaned source text

Amazon was one of the last big names to not sign the open weights letter but they have now signed it 👇 Anthropic is the last remaining big name to not sign it but they did publish their POV on it last night, which is worth a read

Matt Garman (@mattsgarman)

.@amazon has believed in giving customers choice across AI models for years. We have always supported open-weight models on Amazon Bedrock, starting back in 2023, and will continue to advocate for open ecosystems.

No single model will define AI leadership. Customers need access to the most capable frontier models, alongside open-weight models they can adapt, optimize, and deploy for their own workloads.

Open and closed models are complementary. Together, they expand access to AI, accelerate innovation, strengthen competition, and give organizations greater control over the technology they build.

Successful leadership in AI will not be built around a single model or a single approach. It will be built on broad choice and the infrastructure to run those models securely, reliably, and at scale.

While there are elements of the Open Weights and American AI Leadership letter that need further definition over time, we’re supportive of the macro direction and have signed it.

— https://nitter.net/mattsgarman/status/2081890542430851416#m