The week in AI: open-weight giants, a record market day, and Europe's rules arrive
The five stories that defined this week: 1) Anthropic released Claude Opus 5, its new flagship model. 2) The open-weights race went global — Moonshot's Kimi K3 became the largest open release ever, Huawei open-sourced a 505B model trained entirely on its own chips, and LG shipped a 750B open model under Apache 2.0. 3) Microsoft's AI-driven earnings added roughly $450 billion in market value in a single day, the biggest gain in market history. 4) The EU AI Act's transparency rules took effect on August 2 — chatbots must disclose they are AI and deepfakes must be labeled — even as high-risk rules slipped to 2027. 5) A Munich court ruled against Suno in Europe's first major AI music copyright case.
Why it mattersOne thread ties the week together: the frontier is no longer one company's story. Open-weight giants from China, Korea and US chipmakers are closing in on closed labs, markets are pricing AI as the main engine of corporate value, and regulators have moved from writing rules to enforcing them.
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