GLM-5 is the open-weight challenger to Claude's coding crown. Z.ai's flagship, a 744B MoE with DeepSeek Sparse Attention, topped the open-weights intelligence index at launch and is built specifically for agentic engineering and long-horizon tasks. It performs strongly in harnesses like Claude Code and Cline, and you can self-host it for control and cost savings.
Claude Opus 4.5 remains the premium standard for coding quality and reliable autonomous agents, with class-leading SWE-bench scores and careful, steerable reasoning. The gap has narrowed: GLM-5 delivers a large share of Opus-level agentic coding at open-weight prices, while Opus still leads on the very hardest engineering and consistency. For budget-conscious or self-hosted teams, GLM-5 is compelling; for maximum reliability, Opus holds the edge.
Which should you choose?
GLM-5
GLM 5 · 204K context
Pick it if
you want top open-weight agentic coding you can self-host cheaply.
Claude Opus 4.5
Claude Opus 4.5 · 200K context
Pick it if
you need maximum coding quality and agent reliability.
Claude Opus 4.5 leads on peak coding quality and agentic reliability; GLM-5 offers most of that capability with open weights at far lower cost. Choose by budget and your need for self-hosting.
Questions
Is GLM-5 as good as Claude Opus for coding?
It's close on agentic engineering and far cheaper, but Opus 4.5 still leads on the hardest tasks and consistency.
Can I self-host GLM-5?
Yes. GLM-5 ships open weights, unlike Claude, which is API-only.