How to pick the right Claude model in Claude Code (and stop overpaying)

Anthropic just put Fable 5 in everyone's hands, so now you've got three coding models to choose from inside Claude Code. Most people leave it on default and never think about it. That's money left on the table in both directions: overpaying on simple jobs, underpowering the hard ones.

Here's the rule I use.

First, how to switch. Type /model in Claude Code and pick from the list. You can change it mid-session whenever the task changes. That's the whole mechanic; it takes two seconds.

Now when to use which:

1. Haiku for the cheap, repetitive stuff

Renaming files, simple edits, running through a checklist, quick lookups. Don't burn a frontier model on work a small model nails. It's faster and almost free.

2. Opus 4.8 as your daily driver

This is where most of your real work lives. Building features, debugging, writing, planning. It's the best balance of smart and affordable, and it'll handle 90% of what you throw at it.

3. Fable 5 for the long, messy, high-stakes tasks

Big multi-step builds where the cheaper models drift halfway through. Gnarly bugs nobody can crack. The work where one good output is worth more than the token cost. It's twice the price of Opus 4.8, so reach for it on purpose, not by accident.

The simple version: match the model to the difficulty of the task, not the other way round.

One timing note. Fable 5 is free on the paid plans until June 22. So the next couple of weeks are the cheapest chance you'll get to test it on your own real work and feel where it actually pulls ahead before it starts costing credits.

Try this today: next time you start a session, ask yourself "is this a Haiku job, an Opus job, or a Fable job?" before you type the first prompt.

What are you mostly running on right now, and have you noticed a difference when you switch up for the hard stuff?

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How to pick the right Claude model in Claude Code (and stop overpaying)