Is
@AnthropicAI's Fable 5 actually worth the upgrade?
We benched the new "Mythos" family model against Claude Opus 4.8, and the data tells a surprising story:
> Costs 2X more than Claude Opus 4.8.
> Up to 3X slower on long-horizon engineering tasks.
> 15-20% more comments, but mostly minor nitpicks.
Fable 5 has incredible intuition for creative tasks like game design, but for day-to-day dev workflows, Claude Opus 4.8 still takes the crown for quality versus price.
Checkout my discussion with
@JuanPa from our DevEx team at
@coderabbitai on the model release 👇