DeepSeek V4 Pro vs GLM 5.3 FlashX: price, context window and capabilities
DeepSeek V4 Pro (deepseek/deepseek-v4-pro) is a language model from DeepSeek and GLM 5.3 FlashX (z-ai/glm-5.3-flashx) a multimodal language model from Z.ai; both are on the OceanToken API. GLM 5.3 FlashX costs less per token than DeepSeek V4 Pro: $0.37 against $1.056 per 1M input tokens (65% less) and $1.25 against $3.168 per 1M output tokens (61% less). Both have a 1.05M-token context window (1,048,576 tokens). Both support tool calling and reasoning; only DeepSeek V4 Pro also lists structured outputs; only GLM 5.3 FlashX also lists image input and video input.
Side by side
| Spec | DeepSeek V4 Pro −40% | GLM 5.3 FlashX |
|---|---|---|
| Model | DeepSeek V4 Prodeepseek/ | GLM 5.3 FlashXz- |
| Publisher | DeepSeek | Z.ai |
| Kind | Text | Text, vision & video |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,048,576 |
| Input price | $1.056 / 1M tokens | $0.37 / 1M tokens |
| Output price | $3.168 / 1M tokens | $1.25 / 1M tokens |
| Cached input price | $0.044 / 1M tokens | $0.09 / 1M tokens |
| Discount (vs official, top tier) | −40% | — |
| Inputs | text | text, images and video |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Not listed |
About these prices
Which should you choose?
- Choose GLM 5.3 FlashX to spend less per token: 65% less for input and 61% less for output than DeepSeek V4 Pro.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose DeepSeek V4 Pro if you need structured outputs: GLM 5.3 FlashX does not list it.
- Not sure? Call both with the same OceanToken API key and compare them on your own prompts; each request is billed per use from one prepaid balance.
Get API Key DeepSeek V4 Pro GLM 5.3 FlashX
Frequently asked questions
Which is cheaper, DeepSeek V4 Pro or GLM 5.3 FlashX?
GLM 5.3 FlashX. GLM 5.3 FlashX costs less per token than DeepSeek V4 Pro: $0.37 against $1.056 per 1M input tokens (65% less) and $1.25 against $3.168 per 1M output tokens (61% less). These are OceanToken starting prices per use; the OceanToken console always shows the current price.
Which has the larger context window, DeepSeek V4 Pro or GLM 5.3 FlashX?
Neither. Both have a 1.05M-token context window (1,048,576 tokens).
Can I call both DeepSeek V4 Pro and GLM 5.3 FlashX with one API key?
Yes. Both are on the OceanToken API at https://api.oceantoken.ai/v1: one API key and one prepaid balance call either model. Send the model id deepseek/deepseek-v4-pro or z-ai/glm-5.3-flashx.
Models and publishers
DeepSeek V4 Pro · GLM 5.3 FlashX · All DeepSeek models · All Z.ai models
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