Claude Opus 5.5 is Anthropic's latest large language model and the first in the Claude 5.5 family, built for agentic coding and knowledge work. It delivers major performance gains, clearer communication, stronger safety, and costs 40% less to run than Opus 5 on typical workloads.
Claude Opus 5.5
Anthropic's first model in their new Claude 5.5 family
Claude Opus 5.5 Introduction
More about Claude Opus 5.5
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ListedSep 26, 2026
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