GPT-5.4 vs GLM-5: Is Open Source Finally Matching Proprietary AI?

Zhipu AI's GLM-5 became the first open-weight model to score 50 on the Intelligence Index, matching proprietary AI performance on benchmarks and achieving 77.8% on coding tests. However, running GLM-5 requires 1,490GB of memory and eight H200 GPUs costing around $120,000-200,000, making self-hosting impractical for most teams. While GPT-5.4 still leads in terminal operations, context windows, and computer interaction capabilities, the real choice isn't between open and proprietary but between different cost structures and deployment realities.