Anthropic publishes its position on open-weights models amid lobbying accusations

Anthropic's post was framed as ending 'a lot of speculation about where we stand on open-weights models,' and it landed squarely in the middle of the week's dominant industry argument. On Hacker News it hit 517 points and 725 comments, making it one of the most-discussed items of the week and a focal point for the open-versus-closed schism.

The timing is what gave the post its edge. It arrived alongside a widely circulated r/LocalLLaMA report (1,174 upvotes) alleging that OpenAI and Anthropic 'quietly lobby Washington regulators to restrict open-source AI models,' even as Sam Altman publicly says he supports open source. Against that backdrop, Anthropic's carefully worded position was read by many developers as an attempt to get ahead of accusations of hypocrisy.

The context is a broadly shifting landscape: Google's Sundar Pichai publicly reaffirmed support for open weights (Gemma has crossed 300 million downloads), Meta, Mistral and Moonshot continue shipping open models, and NVIDIA is building an Open Secure AI Alliance around them. Anthropic, whose entire safety thesis leans toward controlled, closed frontier deployment, is increasingly the outlier — making a clear public position necessary.

Skeptics on Hacker News and Reddit dissected the post for gaps between stated principle and lobbying behavior, while others defended a nuanced case that the most capable models carry misuse risks that open release can't mitigate. Adding intrigue, speculation that Andrej Karpathy left Anthropic (after removing it from his bio) spread across r/LocalLLaMA and r/singularity with 1,447 upvotes, fueling narratives about internal friction over strategy. What to watch: whether the lobbying reports are substantiated, and whether Anthropic's position hardens or softens as the alliance pressure builds.