Claude Fable 5.2 tops FrontierSWE at 69.9%, beating GPT-6 Astra and Opus 5.5 at 1/6 the cost
aryaman2020 · x · 2026-11-10
Per ProximalHQ's FrontierSWE leaderboard, Claude Fable 5.2 ranks #1 with 69.9%, ahead of GPT-6 Astra (65.5%), Claude Opus 5.5 (62.3%), Claude Sonnet 5.5 (61.9%) and Gemini 4 Carbon (61.2%). The benchmark spans 34 tasks with 5 trials each under a 20-hour budget. Cost gap is striking: Fable 5.2 averages $168.78 per run (16.5h) versus $1029.65 for the runner-up GPT-6 Astra, giving the top model a clear price-performance edge.
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