Shows which models developers actually pair for planning versus execution, such as Opus 4.1 planning with Sonnet 4 acting. Gives a real-usage baseline for choosing a cost-aware model split.
Terms in this piece · Glossary
plan mode — A read-only agent mode that investigates and proposes a plan without editing anything, so you approve the approach before any code changes.
context window — The maximum amount of text a model can consider at once — its working memory for the current conversation or task.
