Choosing the Right Claude Model: Opus 5 vs. Fable 5

Opus 5 is built for collaborative, interactive work — you're in the loop, refining as you go. Fable 5 is built for handing work off — you define the outcome up front and it runs independently until it's done. Neither is 'better'; they're suited to different kinds of tasks.

Long conversations where you're refining ideas together. Working inside project folders. Building simple tools. Cleaning and organising messy data. Quick work you need while you're mid-meeting. Writing in your own tone. Creating presentations and spreadsheets. Anything where you want to ask questions as you go and change direction anytime.

Work you can hand off from start to finish. Multi-step workflows that should run independently. Reviewing contracts or complex documents. High-effort reasoning tasks. Work you genuinely don't want to babysit. Projects with clear goals and constraints defined upfront. Anything that runs for hours rather than minutes.

Opus 5 rewards interactive back-and-forth — give it a rough starting point and refine together. Fable 5 rewards the opposite: one detailed, complete brief with the full context, constraints, and definition of done, so it can plan the whole approach before it starts acting.

If you'd want to check in partway through and steer, that's Opus 5. If you want to write one thorough brief, walk away, and come back to a finished deliverable, that's Fable 5. Matching the model to the task — not defaulting to one for everything — is the actual skill.