Fable 5 is now available to Augment Code users. At ~2x the cost of Opus 4.7, Fable 5 is a premium option for long, multi-step engineering work. Try Fable 5 today in Cosmos, our unified agent platform, to fully experience the power of the most advanced model on the market.

Fable 5 brings a new level of capability to complex software engineering work. We've found it performs best for: - Code review where catching subtle issues matters - PR authoring and implementation support - Large-project planning and architecture reasoning - Long-running, multi-step technical tasks - High-stakes engineering work where quality matters more than cost

TL;DR: Fable 5 isn’t the right-sized model for every task, but when quality and depth matter (review, architecture, long-running changes), the lift is impressive. Here’s how it stacks up vs Opus 4.8 + GPT‑5.5

@augmentcode 代码质量不是写出来的是调试出来的。能跑不算好，能维护才算。 「Fable 5 brings a new level of capability to complex software...」