SWE-Bench Verified March 2026 Leaderboard Shakeup: Claude Opus 4.6 Debuts at 75.6%, Gemini 3.1 Pro Doubles ARC-AGI-2 Score, GLM-5 Enters Top Tier

BenchLM·medium signal

March 2026 SWE-Bench Verified leaderboard saw major new entrants. Claude Opus 4.6 debuted at 75.6% with 1M context window beta. Gemini 3.1 Pro's ARC-AGI-2 score of 77.1% more than doubles Gemini 3 Pro's reasoning performance. GLM-5 joins the top tier alongside Sonnet 4.6 (also launching with 1M context beta). BenchLM weighted rankings: GPT-5.4 leads at 73.9%, Claude Opus 4.6 at 72.5%, Kimi K2.5 Reasoning at 70.4%. February scaffolding upgrade caused significant re-evaluation of all models.