Z.ai: GLM 5.3 FlashX vs Anthropic: Claude Opus 5 (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Z.ai: GLM 5.3 FlashX | Anthropic: Claude Opus 5 (batch) | |
|---|---|---|
| Vendor | z-ai | anthropic |
| Quality Score | 100 | 100 |
| Input Price | $0.37/M | $2.50/M |
| Output Price | $1.25/M | $12.50/M |
| Context Window | 1,048,576 | 1,000,000 |
| Max Output | 131,072 | 128,000 |
| 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 Claude Opus 5 (batch) costs $5.62, so GLM 5.3 FlashX is about 8.2 times cheaper for the same work.
Both take in a similar amount of text: 1,048,576 and 1,000,000 tokens, about 1,573 and 1,500 pages.
Only GLM 5.3 FlashX offers video input.
Across the 10 tasks where they differ, GLM 5.3 FlashX scores higher on 10 (SQL Generation, Code Completion, Code Documentation and others).
GLM 5.3 FlashX was released in September 2026 and Claude Opus 5 (batch) in July 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 | Anthropic: Claude Opus 5 (batch) |
|---|---|---|
| SQL Generation | 133 | 132 |
| Code Completion | 131 | 117 |
| Code Documentation | 131 | 129 |
| Regex Writing | 119 | 117 |
| CSV / Spreadsheet Cleanup | 133 | 132 |
| JSON Extraction | 131 | 121 |
| Bulk Data Labeling | 129 | 117 |
| Long-Document Summarization | 137 | 136 |
| Short-Form Summarization | 123 | 113 |
| Blog Post Writing | 121 | 120 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →