Moayyad Faris

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Engineering Blog

Perspectives on software architecture, building reliable engineering systems, leading technical teams, and open-source framework design.

Artificial Intelligence7 min read· Published 2026-09-25

Claude Opus 5.5: Why the Model Recommendation Just Changed

Opus 5.5 now performs at Claude Fable 5.1's level on most work while costing 40% less than the old Opus 5, and per-token it's now cheaper than Opus 5 was three weeks ago. That changes the advice from this site's last model comparison.

By Moayyad Faris
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