Space Bunny Alpha vs Z.ai: GLM 5.3 Flash
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-24.
| Space Bunny Alpha | Z.ai: GLM 5.3 Flash | |
|---|---|---|
| Vendor | stealth | z-ai |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 70.6 |
| Input Price | Free | $0.15/M |
| Output Price | Free | $0.50/M |
| Context Window | 1,000,000 | 1,310,720 |
| Max Output | 524,288 | 943,718 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | - | 69.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Space Bunny Alpha costs $0 and GLM 5.3 Flash costs $0.28, so Space Bunny Alpha is free for the same work.
Both take in a similar amount of text: 1,000,000 and 1,310,720 tokens, about 1,500 and 1,966 pages.
Across the 20 tasks where they differ, Space Bunny Alpha scores higher on 2 (JSON Extraction, Bulk Data Labeling), GLM 5.3 Flash on 18 (SQL Generation, Code Review, Code Completion and others).
Space Bunny Alpha was released in September 2026 and GLM 5.3 Flash in August 2026.
Pick Space Bunny Alpha if you need lower cost; pick GLM 5.3 Flash if you need 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 | Space Bunny Alpha | Z.ai: GLM 5.3 Flash |
|---|---|---|
| SQL Generation | 134 | 142 |
| Code Review | 132 | 145 |
| Code Completion | 132 | 133 |
| Code Refactoring | 136 | 147 |
| Bug Fixing | 136 | 149 |
| Unit Test Generation | 124 | 132 |
| Code Documentation | 132 | 138 |
| Regex Writing | 120 | 126 |
| CI/CD Pipelines | 120 | 128 |
| Frontend Component Design | 122 | 130 |
| Data Analysis | 124 | 134 |
| CSV / Spreadsheet Cleanup | 134 | 136 |
| ETL Scripting | 128 | 137 |
| JSON Extraction | 132 | 131 |
| Bulk Data Labeling | 130 | 129 |
| OCR / Document Parsing | 131 | 134 |
| Table Extraction from PDFs | 131 | 134 |
| Long-Document Summarization | 138 | 149 |
| Short-Form Summarization | 124 | 127 |
| Blog Post Writing | 122 | 130 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →