Z.ai's large-scale reasoning flagship for complex software engineering and long-horizon agent tasks.
Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.
No shared demos for these models yet.
No captured outputs for these models yet.
Both GLM 5.3 and Claude Sonnet 5.5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.
GLM 5.3 has a lower blended cost. GLM 5.3: $0.22 input / $3.39 output. Claude Sonnet 5.5: $2.00 input / $10.00 output.
GLM 5.3 has a larger context window: GLM 5.3 supports 1M tokens vs Claude Sonnet 5.5 at 1M tokens.
Claude Sonnet 5.5 supports vision/image input, but GLM 5.3 does not.
Key differences: GLM 5.3 is significantly cheaper; only Claude Sonnet 5.5 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 5.3 and Claude Sonnet 5.5 for free on idapt.app to see which performs better for your specific needs.