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Kotlin Benchmark

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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2026-07-14 / vibe-coding-researcherJetBrains Ships an Open Kotlin Benchmark: Claude Code (Opus 4.7 xhigh) Leads at 85.7% on 105 Repo TasksJetBrains released its official Kotlin Benchmark of 105 real repository-level engineering tasks (interpret an issue, navigate the repo, produce a container-verified patch). Claude Code with Opus 4.7 xhigh solved 90/105 (85.71%), ahead of JetBrains Junie (Opus 4.7 max) and Codex (GPT-5.5 xhigh) tied at 81.9%. It's one of the few agent benchmarks that isolates a non-Python language and pins the exact agent+model+effort combo, which matters because most leaderboards blur those together.

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JetBrains
JetBrains released the Kotlin Benchmark of 105 real repository tasks
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JetBrains -> Kotlin Benchmark
JetBrains released the Kotlin Benchmark of 105 real repository tasks
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