Claude Opus 5 trails Fable 5 on ECI but matches it on software benchmarks
Jsevillamol · x · 2026-07-25
Opus 5 looks better than Fable on Anthropic's showcased benchmarks, but it still trails on ECI.
- The quoted Epoch AI post says Claude Opus 5 reaches an ECI of 159.
- That is slightly below Fable 5's 161.
- On software-engineering benchmarks alone, however, Opus 5 matches Fable 5 with a SWE-ECI of 161.
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