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Agents on Rails benchmark leaderboard updated with rerun results for Anthropic Claude Fable 5.1 and Z.ai GLM 5.3 Flash

Benchmark result Provisional 74% confidence first seen

The Agents on Rails benchmark leaderboard was updated after rerunning and reposting results for Anthropic’s Claude Fable 5.1 and Z.ai’s GLM 5.3 Flash. Coverage reports changes in solve rates, median run times, and total costs, with Fable 5.1 listed near the top on multiple price and security-related performance marks, while an independent budget-focused comparison found a smaller advantage than the benchmark’s headline claim.

Anthropic Claude Fable 5 Claude Fable 5.1 GLM 5.3 Flash Agents on Rails Opus 5 Terminal-Bench-Science The New Stack Z.ai ox-alpha

Source coverage

Agents on Rails: Fable 5.1 & GLM 5.3 Flash rubyonrails.org newsletter Fable 5.1 vs. Fable 5: Results on a real-world budget, not the spec sheet The New Stack

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