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4 stories for“Claude Sonnet 5.5”
The new mid-tier model runs more than 30 percent faster while using significantly fewer tokens than Sonnet 5, keeps the same per-token pricing, and is the first Sonnet model to carry the cyber safeguards Anthropic had reserved for Opus.
Sep 29, 2026
From Claude 3.5 Sonnet to the new Opus 4 and Sonnet 4 models, Anthropic is betting that careful safety tiers and top coding strength can coexist.
May 28, 2025
Anthropic's new flagship matches Claude Fable 5.1 on most work at a fifth of the delay and a fifth less cost per token, and beats it outright on agentic coding, computer use and chart reading. Input is 4 dollars, output 20, a fifth cheaper than Opus 5.
Sep 24, 2026
Introductory rates on Anthropic's mid-tier model run out at the end of August, lifting the per-token bill by half. Teams that budgeted during the promotion have four weeks to rework the maths.
Aug 3, 2026
