#claude-opus-5

1 post tagged with "claude-opus-5"

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ai building

Fable 5 vs Opus 5: Why I Demoted the Model I Just Wrote a Whole Post About

Opus 5 became my harness's main-loop default on 2026-07-24, sixteen days after Fable 5 took that seat. Here is the routing logic, the two benchmarks where Fable still wins, and why cost-here flipped the call.

Aug 8, 2026 · 10 min