Z.ai: GLM 5.3 FlashX vs DeepSeek: DeepSeek V4.1 Flash
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-04.
| Z.ai: GLM 5.3 FlashX | DeepSeek: DeepSeek V4.1 Flash | |
|---|---|---|
| Vendor | z-ai | deepseek |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 66.3 |
| 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 | - | - |
| Benchmark Scores | ||
| ai_index | - | 65.1 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, DeepSeek V4.1 Flash costs $0.60 and GLM 5.3 FlashX costs $0.68, so DeepSeek V4.1 Flash 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 20 tasks where they differ, GLM 5.3 FlashX scores higher on 2 (JSON Extraction, Bulk Data Labeling), DeepSeek V4.1 Flash on 18 (SQL Generation, Code Review, Code Completion and others).
Pick GLM 5.3 FlashX if you need video input; pick DeepSeek V4.1 Flash if you need lower cost 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 V4.1 Flash |
|---|---|---|
| SQL Generation | 133 | 141 |
| Code Review | 132 | 144 |
| Code Completion | 131 | 132 |
| Code Refactoring | 136 | 146 |
| Bug Fixing | 136 | 148 |
| Unit Test Generation | 124 | 131 |
| Code Documentation | 131 | 137 |
| Regex Writing | 119 | 126 |
| CI/CD Pipelines | 120 | 127 |
| Frontend Component Design | 122 | 129 |
| Data Analysis | 124 | 133 |
| CSV / Spreadsheet Cleanup | 133 | 136 |
| ETL Scripting | 128 | 137 |
| JSON Extraction | 131 | 131 |
| Bulk Data Labeling | 129 | 129 |
| OCR / Document Parsing | 131 | 134 |
| Table Extraction from PDFs | 131 | 134 |
| Long-Document Summarization | 137 | 148 |
| Short-Form Summarization | 123 | 126 |
| Blog Post Writing | 121 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →