Claude Opus 5.5 is here, with Sonnet and Haiku 5.5 said to be coming
A user relays Anthropic's claim that Opus 5.5 performs around the level of its previous Fable 5.1 flagship while costing 40% less to run than Opus 5.
TLDR
A user says Opus 5.5 is out, Sonnet 5.5 has been officially confirmed as coming, and Haiku 5.5 is on the way. The user also relays Anthropic's performance and cost claims for Opus 5.5, while asking how much of that improvement might reach Sonnet. They say it remains to be seen whether leaks about Sonnet 5.5 hold up.
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3 Sources, first seen 5h ago