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Both Grok 4.6 and GLM 5.1 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 5.1 has a lower blended cost. Grok 4.6: $2.00 input / $6.00 output. GLM 5.1: $0.97 input / $3.04 output.
Grok 4.6 has a larger context window: Grok 4.6 supports 500K tokens vs GLM 5.1 at 200K tokens.
Grok 4.6 supports vision/image input, but GLM 5.1 does not.
Key differences: GLM 5.1 is significantly cheaper; only Grok 4.6 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 Grok 4.6 and GLM 5.1 for free on idapt.app to see which performs better for your specific needs.