Z.ai: GLM 5.3 FlashX vs DeepSeek: DeepSeek Flash Latest
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-04.
| Z.ai: GLM 5.3 FlashX | DeepSeek: DeepSeek Flash Latest | |
|---|---|---|
| Vendor | z-ai | ~deepseek |
| Quality Score | 100 | 100 |
| Input Price | $0.37/M | $0.00/M |
| Output Price | $1.25/M | $2.40/M |
| Context Window | 1,048,576 | 1,048,576 |
| Max Output | 131,072 | 943,718 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, DeepSeek Flash Latest costs $0.60 and GLM 5.3 FlashX costs $0.68, so DeepSeek Flash Latest is slightly cheaper for the same work.
Both read up to 1,048,576 tokens at once, roughly 1,573 pages of text.
Only GLM 5.3 FlashX offers video input.
Across the 6 tasks where they differ, GLM 5.3 FlashX scores higher on 6 (Code Completion, Code Documentation, Regex Writing and others).
Pick GLM 5.3 FlashX if you need video input or the stronger all-round task scores; pick DeepSeek Flash Latest if you need lower cost.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
Who wins by task?
| Task | Z.ai: GLM 5.3 FlashX | DeepSeek: DeepSeek Flash Latest |
|---|---|---|
| Code Completion | 131 | 131 |
| Code Documentation | 131 | 131 |
| Regex Writing | 119 | 119 |
| JSON Extraction | 131 | 131 |
| Bulk Data Labeling | 129 | 129 |
| Short-Form Summarization | 123 | 123 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →