Anthropic opens Claude plugin directory submission portal

A r/ClaudeAI poster says they repeatedly tell Opus 5.5 "you're absolutely right" during a single session, calling its ability to "get it" awe-inspiring. No benchmarks, version details, or official confirmation accompany the anecdote.

Six months after no model cleared 1% on ARC-AGI-3, GPT-6-Astra-Max hit 62.7% with no harness, per a Reddit follow-up to a March 25 RemindMe thread. The run cost $26.1k, far above the commenter's $2 target; Astra shipped September 3.

Halcyon founder and CEO Mike McCormick says the bottleneck in AI safety, biosecurity, and cybersecurity is a shortage of experienced founders rather than funding. Halcyon's venture and nonprofit arms have backed roughly 30 new organizations.

Physicist and science writer Matt von Hippel issued a challenge to AI companies over computing scattering amplitudes in theoretical physics; Claude beat it about a month later. The guest post on Anthropic's Science Blog describes the nine-loop result.