Anyone else surprised that Opus 5 is both stronger and cheaper than Fable? 🤔

I was looking through the newly released benchmark comparison, and one thing stood out immediately.

Opus 5 outperforms Fable 5 on many of the benchmarks that matter to me:

* Agentic terminal coding: 43.3% vs 33.7%
* Knowledge work: 1861 vs 1747
* ARC-AGI-3: 30.2% vs —
* Computer use: 70.6% vs 66.1%
* Business workflows: 26.0% vs 17.4%

Yet from what I’ve seen, the API pricing is also lower than Fable’s.

As someone building AI products, that’s a pretty interesting combination. Usually when a model takes the lead on benchmarks, it’s also the most expensive option.

I’m curious about real-world experience though.

Has anyone here already switched from Fable to Opus 5?

* How does it perform on long coding sessions?
* Is the benchmark advantage noticeable in production?
* Any hidden downsides (latency, tool use, context handling, reliability)?

Would love to hear from people who’ve actually deployed both.