Sonnet 5.5 xhigh hits Fable 5.1-level performance at a third of the cost
theimposingshadow · reddit · 2026-09-29
A Reddit user flags a price/performance sweet spot based on Artificial Analysis data: Sonnet 5.5 at xhigh effort scores 52 on the Intelligence Index at $2.74/task, nearly matching Fable 5.1 Max (53) which costs $7.63/task. The takeaway: most users paying for Max effort should switch to xhigh for roughly one-third the cost at essentially equivalent quality.
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