Claude Fable 5.2 is now available in Devin

Devin added Claude Fable 5.2 as a model option. On FrontierCode 2.0, Devin's own benchmark for real-world engineering tasks scored on quality and mergeability, Devin reports Fable 5.2 at 49.1%, the top score. That's up from Fable 5.1's 32.4% and ahead of Opus 5.5's 45.5%.

Devin also says the gain shows up at lower settings. At low reasoning effort, Fable 5.2 beats Fable 5.1's best result at less than a third of the cost per task. On the benchmark, a solution that fails the blocking criteria scores 0, and cost is the mean USD per rollout at list API pricing.