Use Fable instead of Opus

A user on dev_community expressed frustration with Opus, specifically version 5, noting that it inexplicably creates numerous subagents for relatively straightforward tasks, consuming a significant portion of the token budget. This behavior, observed over the last two weeks, was not present in earlier versions like 4.6, which was considered great, or even 4.8, which was usable. The user suggests using Fable instead of Opus due to these issues.