Which AI coding agent topped the first Kotlin Benchmark leaderboard?
Claude Code running Opus 4.7 in xhigh mode led at launch, resolving 90 of 105 tasks for an 85.71% resolution rate. JetBrains' own Junie agent (Opus 4.7 max) and OpenAI's Codex (GPT-5.5 xhigh) tied for second at 81.9% each, per JetBrains' July 8, 2026 results.
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JetBrains Built Its Own AI Coding Benchmark Because It Doesn't Trust Anyone Else'sJetBrains released a 105-task, open Kotlin coding benchmark on July 8, 2026 — and Claude Code beat JetBrains' own Junie agent by 3.81 points at launch.
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