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Anthropic's Claude 5.5 family: Opus, Sonnet and Haiku released

This story is from 2026-10-21. It is preserved in the archive; the latest stories are on the live feed.

Anthropic's announcements page records three model releases in the Claude 5.5 line, issued within a few weeks of each other in late September and early October 2026. What was released Claude Opus 5.5 (Sep 22, 2026). Anthropic says it leads in agentic coding and knowledge work, and that it costs 40%…

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  1. 2026-10-21 17:47 · DEV Community — AI
    Anthropic's Claude 5.5 family: Opus, Sonnet and Haiku released

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