Z.ai: GLM 5.3 FlashX vs DeepSeek: DeepSeek V4 Flash Vision Exp
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Z.ai: GLM 5.3 FlashX | DeepSeek: DeepSeek V4 Flash Vision Exp | |
|---|---|---|
| Vendor | z-ai | deepseek |
| Quality Score | 100 | 100 |
| Input Price | $0.37/M | $0.44/M |
| Output Price | $1.25/M | $1.32/M |
| Context Window | 1,048,576 | 1,048,576 |
| Max Output | 131,072 | 943,717 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GLM 5.3 FlashX costs $0.68 and DeepSeek V4 Flash Vision Exp costs $0.77, so GLM 5.3 FlashX 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 5 tasks where they differ, GLM 5.3 FlashX scores higher on 5 (Code Completion, Code Documentation, Regex Writing and others).
GLM 5.3 FlashX was released in September 2026 and DeepSeek V4 Flash Vision Exp in August 2026.
Pick GLM 5.3 FlashX if you need lower cost, video input or the stronger all-round task scores.
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 V4 Flash Vision Exp |
|---|---|---|
| Code Completion | 131 | 131 |
| Code Documentation | 131 | 131 |
| Regex Writing | 119 | 119 |
| JSON Extraction | 131 | 131 |
| Short-Form Summarization | 123 | 123 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →