METR report suggests Anthropic is secretly testing unreleased models incl. Claude Sonnet 6
WorldofAI · youtube · 2026-11-06
- A WorldofAI YouTube roundup claims an independent METR report reveals Anthropic has been developing multiple unreleased models behind the scenes — reportedly Fable 5.5, Opus 6 and Fable 6 — and may be secretly benchmarking the next-generation Claude Sonnet 6.
- The video also aggregates other items: OpenAI's GPT-6.2 Astra, personal finance in Claude, Thinking Machines' Inkling 2 Small, Vercel's agent-desktop, and more, with source links.
- Caveat: this is secondhand aggregator content with heavy self-promotion; verify against METR's original report.
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