Fable Cost $18 a Fix on Private Code. Flash Cost $8.
On Specific Labs' Real-SWE benchmark of licensed private codebases, Fable 5.1 resolved the most tasks but cost about $17.94 per fix to Gemini 3.8 Flash's $8.01 — and each model fails in its own way, so your review gate should follow the agent you pick.
September 13, 2026 · 14 min read