A few patterns we frequently use with Fable 5: Use Fable 5 as an "advisor." An executor (Sonnet 5) calls Fable 5 for guidance. Most tokens are billed at the lower executor rate.
On SWE-bench Pro, Sonnet 5 + a Fable 5 advisor tool gets ~92% of Fable 5's score at ~63% of the price. Fable 5 is called rarely (~once) per task to steer while Sonnet 5 executors the majority of the work. See our docs to learn more: https://platform.claude.com/do...
A second strategy: use Fable 5 as an orchestrator. Fable 5 plans and delegates to workers (Sonnet 5). Most tokens are billed at the lower worker rate.
On BrowseComp, we tested Claude Managed Agents w/ Fable 5 orchestrator + Sonnet 5 worker sub-agents. The Fable 5 orchestrator achieves 96% of Fable 5 performance at 46% of the price. Token-heavy research is delegated to Sonnet 5. See our cookbook: https://github.com/anthropics/...
Claude Managed Agents supports both patterns with sub-agents. Escalate up to a Fable 5 advisor, or delegate down to Sonnet 5 workers. Each sub-agent keeps its own cache, so repeat calls don't pay in full for the same context twice. https://platform.claude.com/do...