OpenAI's GPT-6 Luna served in pro reasoning mode for the hardest problems.
Z.ai's large-scale reasoning flagship for complex software engineering and long-horizon agent tasks.
No shared demos for these models yet.
No captured outputs for these models yet.
Both GPT 6 Luna Pro and GLM 5.3 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.
GPT 6 Luna Pro has a lower blended cost. GPT 6 Luna Pro: $0.10 input / $0.50 output. GLM 5.3: $0.22 input / $3.39 output.
GPT 6 Luna Pro has a larger context window: GPT 6 Luna Pro supports 1.1M tokens vs GLM 5.3 at 1M tokens.
GPT 6 Luna Pro supports vision/image input, but GLM 5.3 does not.
Key differences: GPT 6 Luna Pro is significantly cheaper; only GPT 6 Luna Pro 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 GPT 6 Luna Pro and GLM 5.3 for free on idapt.app to see which performs better for your specific needs.