Grok 4.5 tops VulcanBench on accuracy and cost efficiency
XFreeze · x · 2026-07-22
VulcanBench ranks Grok 4.5 first on both accuracy and cost efficiency.
- At medium effort, Grok 4.5 solved 21/23 tasks with a 91.3% pass rate at a total cost of $6.67.
- That works out to about $0.32 per solved task, versus $0.61 for the best Claude Fable 5 run and $0.80 for the best GPT-5.6 Sol run.
- The benchmark screenshot also shows Grok 4.5 holding the top spot on the efficiency frontier, with higher effort increasing cost but not improving the 21/23 result.
The post argues that Grok 4.5 is the best tradeoff on the board: more accurate than Fable 5 and GPT-5.6 Sol, while costing substantially less per solved task.
Related event: Grok 4.5 Tops VulcanBench Software Engineering Leaderboard(2 posts)→
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