Claude Fable 5.1 vs Opus 5: What Changed?
Claude Fable 5.1 is a substantial evolution of Fable 5, not simply a minor model refresh. The biggest changes are stronger long-running agentic coding and research, improved document and spreadsheet workflows, lower cache-read pricing, more flexible effort controls, user-facing progress updates, and several API behavior changes. For most everyday workloads Anthropic still recommends Opus 5, … Read more