Chart says Claude Opus 5 blocks far less defensive coding than Fable 5
repligate · x · 2026-07-25
A repost highlights a chart claiming that, on this traffic, Claude Opus 5 blocks significantly less defensive coding than Claude Fable 5.
The figure shows classifier flag rates for production secure-coding sessions:
- Claude Opus 4.8: 0.78%
- Claude Fable 5: 14.99%
- Claude Sonnet 5: 0.52%
- Claude Opus 5: 0.61%
The caption argues that Opus 5 should feel similar to prior Opus-class models while giving defenders and defensive cyber use cases a lower-friction experience.
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