AIHacker Noonabout 5 hours ago
Claude Opus 5 Rumors Lack API Contract Proof
8 min read
A screenshot claiming Claude Opus 5 would launch on Vertex and Cursor circulated with product-like detail including a 1-million-token context window. Anthropic's current model catalog lists Fable 5, Opus 4.8, and Sonnet 5 but no Opus 5. Google Cloud and Cursor public catalogs also lack an Opus 5 entry. The rumor fails the operational test of a supported model contract.
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