DeepSeek V4 Pro and GLM-5.1 land in the same spot on Vizify’s access-tier ladder: both are Paid, both take text-only input, and neither currently accepts an uploaded image. With modality and tier tied, the practical choice between them comes down to which family you’d rather work with and how you want to control reasoning.
DeepSeek V4 Pro benefits from a published model page at /models/deepseek/, which also covers the Flash variant. Both DeepSeek variants require paid model access. GLM-5.1 is documented on the Z.ai maker page at /models/zai/ alongside the rest of the GLM-5 family, and carries the same text-only input contract, so both sides are equally reachable from the model picker.
GLM-5.1 now has a successor, GLM-5.3, with the same Paid tier and text-only input and graded low, high, or max reasoning effort. GLM-5.1 stays available, so this comparison still applies if you want to keep using it. For the newer pairing, see DeepSeek V4 Pro vs GLM-5.3.
As with every comparison on this site, Vizify runs one model per request rather than testing DeepSeek V4 Pro and GLM-5.1 side by side automatically. Pick a starting point from the facts above, and switch to the other for a later request if you want to try it on the same task.