Verdict
Claude Fable 5 leads 17–1 across 18 shared benchmarks.
Claude Fable 5 17 · Claude Opus 4.7 1 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: Claude Fable 5 leads 3–1 across 4 shared reasoning benchmarks (largest gap: SimpleBench, 78.28 vs 55.48 — single evaluator).
Unknown: Claude Fable 5 leads 3–0 across 3 shared unknown benchmarks (largest gap: ProofBench, 95 vs 54 — single evaluator).
Coding: Claude Fable 5 leads 2–0 across 2 shared coding benchmarks (largest gap: MirrorCode, 63.89 vs 31.11 — single evaluator).
Math: Claude Fable 5 leads 2–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 87.8 vs 31.71 — single evaluator).
Vendor claims — compare against the measured scores above. A claim is what a developer says about its own model, not an independent measurement.
Agentic / Tool Use
“The longer and more complex the task, the larger Fable 5's lead over our other models”
Coding
“It is state-of-the-art on nearly all tested benchmarks of AI capability, showing exceptional performance in software engineering, knowledge work, vision, scientific research, and many other areas”
General
“Fable 5's capabilities exceed those of any model we've ever made generally available”
Multimodal
“It can extract precise numbers from detailed scientific figures and can perform complex vision-based tasks like rebuilding a web app's source code from screenshots alone”
Agentic / Tool Use
“Users report being able to hand off their hardest coding work-the kind that previously needed close supervision-to Opus 4.7 with confidence”
Coding
“Opus 4.7 is a notable improvement on Opus 4.6 in advanced software engineering, with particular gains on the most difficult tasks”
Reasoning
“Second, Opus 4.7 thinks more at higher effort levels, particularly on later turns in agentic settings”
Claude Fable 5 leads 17–1 across 18 shared benchmarks. Claude Fable 5 leads 17 benchmarks and Claude Opus 4.7 leads 1. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Fable 5 and Claude Opus 4.7 have 18 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Claude Fable 5 leads unknown 3–0. Claude Fable 5 leads reasoning 3–1.