Unverified50% confidenceBenchmarkExact time
When the same optimized environment is used directly with Opus 5, cost drops by 68.1% while the pass rate still grows by 1.34%.
1
Sources
50%
Confidence
Long-term
Relevance
11/6/2026
First Seen
Sources
Related Entities
Related Claims
VerifiedOpus 5.5 reaches the level of Fable 5.1 on most tasks, but with approximately 40% lower operating costs and faster speed.76% similarUnverifiedCompared to Claude Fable 5.1, Opus 5.5's per-task cost is reduced by 67.6%.70% similarUnverifiedThe out-of-bounds risk of Claude Opus 5.5 has decreased by approximately 85% compared to the previous version.69% similar
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