#claude-fable-5-vs-opus-4-8

1 post tagged with "claude-fable-5-vs-opus-4-8"

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ai building

Fable 5 vs Opus 4.8: Every Reasoning Tier Benchmarked

Fable 5 low beats Opus 4.8 xhigh on SWE-bench Pro. Full tier matrix, low through xhigh, with per-task cost reads and the routing rule for agentic coding. Updated September 1, 2026 for Claude Fable 5.1, whose per-token price did not change, and for where Opus 5 changes the answer.

Jun 10, 2026 · 30 min