Head to head
Claude Fable 5 vs Claude Opus 5
Which is better, Claude Fable 5 or Claude Opus 5?
Claude Fable 5 finishes ahead of Claude Opus 5 on the index, 89.2 to 88.5. It is the stronger of the two on Craft, while Claude Opus 5 still leads on Speed and Value. Both are scored on the same rubric, in the same week, and neither placing is sponsored.
Updated
Claude Fable 5
01 of 53
89.2
The best answer money can buy, and it is a lot of money.
Claude Opus 5
03 of 53
88.5
Most of the flagship, at half the price. The one to reach for by default.
The four scores, side by side
| Score | Claude Fable 5 | Claude Opus 5 | Difference |
|---|---|---|---|
| Craft | 98 | 93 | +5 |
| Speed | 76 | 82 | +6 |
| Control | 91 | 90 | +1 |
| Value | 70 | 78 | +8 |
| Index score | 89.2 | 88.5 | +0.7 |
Which to pick
Pick Claude Fable 5 unless Speed and Value is what decides it for you, which is exactly where Claude Opus 5 is the better answer.
Claude Fable 5
Anthropic's flagship sits at the top of almost every quality benchmark that still discriminates between frontier models, and it is the only one people trust to run for hours without a human reading every step. It is also the most expensive model in this index by a clear margin, and it is not fast. Reach for it when the cost of a wrong answer is higher than the cost of the tokens, and reach for something else when it is not.
Where it shines
- Holds a long, messy task together for hours without drifting
- Leads the field on software engineering benchmarks that are not yet saturated
- Refuses cleanly and explains itself rather than inventing an answer
Claude Opus 5
Opus 5 is the model that makes the rest of Anthropic's line-up hard to justify. It gives up a little at the very top of the reasoning range and takes half off the bill, while staying quick enough to sit inside an editor or an agent loop. If you are choosing one paid frontier model and do not want to think about it again this quarter, this is the honest answer.
Where it shines
- Frontier-class output without the flagship's price
- Fast enough for interactive use, unlike the tier above it
- Excellent at long-context reading of an existing codebase