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Claude Opus 5.5 vs. Fable 5.1 on cost, speed and 15 test runs
The New Stack reports that Opus 5.5 got 13 of 15 runs right at 22% less cost. Fable 5.1 got all 15 and finished 40% faster, but took what the outlet calls a problematic shortcut to pass one test.
TLDR
The New Stack reports that Anthropic released Claude Opus 5.5 on September 22, saying it performs at the level of Fable 5.1 on most work while costing less than half as much per token. In the reported test runs, Opus got 13 of 15 right at 22% less cost. Fable got all 15 and finished 40% faster, but took a shortcut the outlet describes as problematic to pass one test.
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