Claude Fable 5.2 Arrives in Devin, Tops Real-World Coding Benchmark

At a glance

Claude Fable 5.2 is now available in Devin, an AI developer tool. It scored 49.1% on FrontierCode 2.0, a test of real engineering work, taking the top spot.

Key points

1. 1

   FrontierCode 2.0 measures code quality and whether changes can be merged into real projects.

2. 2

   Fable 5.2 improved strongly over Fable 5.1's 32.4% and beat Opus 5.5's 45.5%.

3. 3

   At low reasoning effort (how much effort the AI spends on an answer), Fable 5.2 already beat Fable 5.1's best score, at less than a third of the cost per task.

Why it matters

Better results at a much lower cost can help developers choose which AI coding tool to use.