- Start with Opus 5.5. Anthropic calls it its “strongest daily driver”.
- Move up to Fable 5.2 for big, open-ended work: projects with many parts, or jobs that run for hours.
- Fable costs twice as much per token. Use it where it earns it.
Fable 5.2 vs Opus 5.5 at a glance
| Fable 5.2 | Opus 5.5 | |
|---|---|---|
| Built for | Long, ambitious work with many steps | Everyday coding and knowledge work |
| Price per million tokens, in / out | $8 / $40 | $4 / $20 |
| Speed | Moderate | Moderate |
| How much it can read at once | 1 million tokens | 1 million tokens |
| Anthropic’s advice | Move up to it when the work needs it | Start here |
How they score
Writing code that gets accepted
FrontierCode 2.0
Running real business workflows
AutomationBench
Using a computer like a person would
OSWorld 2.1
Office-style knowledge work
AA-Briefcase v1.1, rubric score
Reading charts and figures
Chartography
Scores published by Anthropic on 9 November 2026. Higher is better. One wrinkle: on the knowledge-work test, Opus 5.5 still wins the head-to-head ranking, 1,800 to 1,785.
What changed from Fable 5.1
Which one for which job?
| The job | Use |
|---|---|
| Day-to-day coding and analysis | Opus 5.5 |
| A project that runs for hours on its own | Fable 5.2 |
| Planning work, then checking what smaller models did | Fable 5.2 |
| Reading a complicated chart | Fable 5.2 |
| A quick draft, summary or question | Sonnet 5.5 |
| Simple jobs, thousands of them | Haiku 5.5 |
Since July I’ve run my business on one rule: the big model is the boss, the smaller one is the worker, and the boss checks the work.
Anthropic now suggests the same shape. Let Fable direct smaller models, or let them ask it for help on the hard parts.
I moved my own work to Fable 5.2 the day after it came out.
Three mistakes I see people make
- Picking the newest model for everything.It costs twice as much, and a simple job doesn’t come back any better.
- Reading one benchmark as the whole story.Opus 5.5 still wins one of the knowledge-work rankings.
- Blaming the model for a thin answer.Usually the request was thin. Fix that first.
How to choose, step by step
Talk it through with me. Tell me what your work looks like and we’ll find where AI helps first.
Quick answers
Is Fable better than Opus?
On Anthropic’s published tests, yes, on almost everything: coding, business workflows, computer use and reading charts.
It also costs twice as much per token, so Anthropic still recommends starting with Opus 5.5.
What is the difference between Fable 5.2 and Fable 5.1?
Fable 5.2 is up to 30% faster, 20% cheaper per token, and scores higher on every test Anthropic published.
It also blocks about 55% fewer requests by mistake.
Is Fable 5.2 more expensive than Opus 5.5?
Yes, twice as much through the API: $8 in and $40 out per million tokens, against $4 and $20.
On a Claude plan you don’t pay per token. Limits apply and they change, so check your plan.
What is Claude Mythos?
The same underlying model as Fable, without some of the cybersecurity and biology safeguards. Only verified organizations can use it.
Which is better for coding, Fable or Opus?
Opus 5.5 for most coding. Fable 5.2 scores higher on the hardest coding test, 49.1% against 45.5%, and suits long projects with many parts.
Should I switch from Fable 5.1 to Fable 5.2?
Yes. It is faster, cheaper and scores higher on every test Anthropic published, and it replaces 5.1 as the current model.
Next: the best Claude model for each job, Opus vs Sonnet, and Claude vs ChatGPT.
AI Foundations starts here: give AI a clear picture of your business in a form you can reuse, so you stop explaining from zero.
Background: Anthropic: Introducing Claude Fable 5.2 · Claude docs: model comparison and prices. Figures checked 10 November 2026.