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A practical comparison for agent workflows, coding, data analysis and computer use, with benchmarks, API prices and a plan for your own evaluation.

Half of Opus’s input and output rates does not mean half the bill. A practical pilot for support and development, with cache costs and Messages API changes.

Opus 5.5 cuts token and cache costs, but changes thinking, tool selection and conversation handling. Validate the integration first, then measure cost per completed task.

Claude Fable 5.1 cuts prompt-cache reads to $0.25 per million tokens and adds finer agent controls. It also brings three breaking changes that need testing before production.

Fable 5 is available again after the June suspension. For companies, that does not mean using it everywhere. It belongs in a model router as an expensive specialist with budget control, fallback, and audit.