GPT-6 Astra and Claude Fable 5.1 bring AI closer to handling complete pieces of work.

GPT-6 Astra and Claude Fable 5.1: what changes for work?

• Astra can do more inside your computer. Astra can work across websites and applications to research information, update customer records and produce documents, spreadsheets and presentations.

• Fable 5.1 improves at difficult, extended tasks. Fable 5.1 reports stronger performance in coding, research and office work. In one customer test, it traced a recurring software crash that had remained unexplained for years.

• The comparison depends on the work. Ruben Hassid describes Astra as smarter, faster and cheaper, highlighting computer use as its biggest advantage. Artificial Analysis’s v4.2 comparison places Fable 5.1 first overall, while Astra leads its test of reasoning across professional documents.

• Following Astra’s launch, Nvidia CEO Jensen Huang wrote: “AGI has arrived.”

Claude made a famous mathematical proof fully computer-checkable.

• Fermat’s Last Theorem was proved in 1995. Claude worked from an existing version of that proof.

• In 11 days, it converted the reasoning into a form that specialist software called Lean could check, working largely independently with occasional human guidance.

• The result is the first computer-checked proof of the theorem. The advance is making every logical step verifiable.