AI Reports · Anthropic · 2026-10-21 · Product announcement
Models
Anthropic is an AI safety and research company working to build reliable, interpretable, and steerable AI systems. Its models page introduces Claude Haiku 5.5, its fastest and most capable small model built for high-volume work such as summarization, subagents, and browser use; Claude Sonnet 5.5, a clear upgrade over Claude Sonnet 5 that runs 30%+ faster and costs up to 30% less for most work; and Claude Opus 5.5, which leads in agentic coding and knowledge work and costs 40% less to run than Opus 5 on typical workloads. It also lists Claude Mythos and Fable 5.1 as the world's most advanced models for coding and knowledge work.