Claude Platform model guidance for Haiku Sonnet Opus Fable

This guide provides practical recommendations on how to choose and use the Claude model lineup—including Haiku 5.5, Sonnet 5.5, Opus 5.5, and Fable 5.2—balancing cost, latency, and capability across different tasks. The author discusses strategies such as adjusting effort levels, routing simpler subagent work to cheaper models, and managing prompt caching and context windows for optimal performance. Open article →