Zhipu AI's most capable model with a major leap in coding and long-horizon task performance.
Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.
No shared demos for these models yet.
No captured outputs for these models yet.
Based on the Capability Index, GLM 5.1 scores higher (82.3 vs 80.1). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
GLM 5.1 has a lower blended cost. GLM 5.1: $0.97 input / $3.04 output. Claude Sonnet 5: $2.00 input / $10.00 output.
Claude Sonnet 5 has a larger context window: GLM 5.1 supports 200K tokens vs Claude Sonnet 5 at 1M tokens.
Claude Sonnet 5 supports vision/image input, but GLM 5.1 does not.
Key differences: GLM 5.1 is significantly cheaper; only Claude Sonnet 5 supports vision input. Compare full specs on this page.
If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GLM 5.1 and Claude Sonnet 5 for free on idapt.app to see which performs better for your specific needs.