Agents on Rails: We have a new best performer. @claudeai Fable 5.1 by @AnthropicAI dropped yesterday, and was benchmarked today.
Fable 5.1 scored just as well as Claude Opus 5 on accuracy, but surpassed Opus on all other marks: it’s cheaper, faster, more efficient with steps,
Ruby on Rails scales from PROMPT to IPO. Token-efficient code that's easy for agents to write and beautiful for humans to review.

