OpenAI's original omni model supporting text and image inputs.
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 4o 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.
GLM 5.3 has a lower blended cost. GPT 4o: $2.50 input / $10.00 output. GLM 5.3: $1.40 input / $4.40 output.
GLM 5.3 has a larger context window: GPT 4o supports 128K tokens vs GLM 5.3 at 1M tokens.
GPT 4o supports vision/image input, but GLM 5.3 does not.
Key differences: only GPT 4o supports vision input; only GLM 5.3 offers extended reasoning mode. 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 4o and GLM 5.3 for free on idapt.app to see which performs better for your specific needs.