Claude Fable 5, GPT-5.5, and Gemini 3.1 Pro: The Current Leaders?
SWE-Bench Pro: Claude Fable 5 hits 80.3 percent, GPT-5.5 lands 58.6, Gemini 3.1 Pro 54.2 Gemini stays cheapest at 2 dollars per million input, Fable 5 costs 10 but undercuts GPT-5.5 Pro Only Anthropic ships a two-tier safety design: risky prompts get Opus 4.8 answers, not refusals My stack: Fable 5
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