Moonshot releases the full weights of Kimi K3 tomorrow — at 2.8 trillion parameters, the largest open model ever. And right on cue, experts are pushing back on the White House claim that it was distilled from Anthropic's Fable.
As Washington weighs a ban on Chinese open-weight models, three of the biggest tech companies are pushing back. Nvidia, Microsoft and Meta explicitly warn against 'premature restrictions' — with plenty of self-interest baked in.
The official launch is done — now comes the more honest part: independent testing. Simon Willison and several benchmark shops have put Opus 5 through the wringer. The verdict is strikingly clear — with one notable security highlight.
With version 2.1.219, Opus 5 lands in Claude Code — and quietly becomes the default model. Add 27 CLI changes, a tool for direct shell output, and the ability to launch subagents for complex tasks.
One day after the big 2.1.219 that made Opus 5 the default, along comes 2.1.220 — and deliberately does nothing flashy. Why that's actually a good sign.
Anthropic launched Claude Opus 5 — close to Fable 5's frontier intelligence, the company says, but at half the cost. Opus 5 becomes the new default on Max and Pro. And in one area, the model deliberately holds back.
Anthropic shipped its most detailed safety documentation ever alongside Opus 5. Two numbers stand out — and they pull in opposite directions.
OpenAI pulled ChatGPT Voice into the desktop app for Mac and Windows — straight into Work and Codex. What's new: voice control for computer use and coordinating multiple agents. You don't just talk, you conduct.