GLM-5.1 Becomes First Open Model to Break Into Code Arena Top 3 — Ranks Ahead of GPT-5.4 and Gemini 3.1 Pro

r/LocalLLaMA·high signal

Zhipu's GLM-5.1 ranked third on Code Arena, leapfrogging GPT-5.4 and Gemini 3.1 Pro with a 90+ point jump over its predecessor GLM-5. The post drew 491 upvotes and 95 comments on r/LocalLLaMA. GLM-5.1 also topped SWE-Bench Pro with a 58.4 score (vs GPT-5.4 at 57.7 and Opus 4.6 at 57.3), making it the first open-source model to lead that benchmark globally. At 94.6% of Opus 4.6's coding performance, this represents a genuine inflection point for open-source model competitiveness in code.