OpenAI and Google Deepmind later signed an open letter opposing regulation of open-weight AI models. Many major tech companies back the letter：https://www.microsoft.com/en-us/corporate-responsibility/topics/open-weight/, most with business interests in open AI models, which now come mainly from China. Microsoft and Google sell access through their services：https://the-decoder.com/microsofts-open-weight-ai-push-is-so-obviously-an-azure-play-it-hurts/, and many backers also want to curb Anthropic and OpenAI's market power. Google Deepmind develops open models of its own, including the successful Gemma series：https://the-decoder.com/gemma-4-gets-a-stealth-update-that-fixes-tool-calling-bugs-and-truncated-responses-under-the-same-name/.
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