Many users celebrated Claude Fable 5 topping the FrontierCode benchmark and integrating into Devin because it signals a major capability jump and near-term profitability.
A new top scorer just one day after our benchmark released! Especially strong on the hardest tasks: 13.4% -> 29.3% on FrontierCode Diamond compared to Opus 4.8.
Claude Fable 5 is now available in Devin.
Fable 5 earns the #1 spot on FrontierCode, our benchmark for real-world engineering tasks that grades mergeability and quality:

You can try Claude Fable 5 as part of Devin Cloud’s Ultra agent. Devin Ultra is our smartest and most capable agent, which excels at long-horizon tasks and debugging.
We tuned the harness so Ultra costs only ~40% more than default Devin agent.
Claude Fable 5 is also available in Devin Desktop and Devin CLI.

Try out Devin today! http://devin.ai

Read our blog post: https://devin.ai/blog/claude-fable-5-available-in-devin

@cognition Are we already gonna get saturated 😭

@cognition Gaslighting benchmarks. Real world 5.5 mogs 4.8.

@cognition LETS GOO

@cognition @devarbol definitely not a bubble. Another step change in capability.

@cognition Finally, Devin's user will get a taste of Fable 5

@cognition benchmark stacking gets boring but fable 5 actually sounds useful for once
is mergeability the metric that matters most here?

@cognition oh boy

@cognition Wow, that's a significant jump up. Excited to build with Fable 5

@cognition That's a good deal!

@cognition Let's Flipping gooo

@cognition

@cognition @dabit3 Bc

@cognition @dabit3 Omg….

@cognition Keep your LLMs & agents secure! https://github.com/OraclesTech/guardian-sdk

@cognition @devarbol They are gonna be profitable this year