SpaceXAI: Grok 4.20 vs Qwen: Qwen3.5-Flash
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| SpaceXAI: Grok 4.20 | Qwen: Qwen3.5-Flash | |
|---|---|---|
| Vendor | x-ai | qwen |
| Quality Score | 100 | 100 |
| Benchmark Score | 56.5 | - |
| Input Price | $1.25/M | $0.07/M |
| Output Price | $2.50/M | $0.26/M |
| Context Window | 2,000,000 | 1,000,000 |
| Max Output | 1,800,000 | 65,536 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 61.0 | - |
| eqbench | 45.7 | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Qwen3.5-Flash costs $0.13 and Grok 4.20 costs $1.88, so Qwen3.5-Flash is about 14.4 times cheaper for the same work.
Grok 4.20 reads up to 2,000,000 tokens at once, roughly 3,000 pages of text, against about 1,500 pages for Qwen3.5-Flash.
Only Qwen3.5-Flash offers video input.
Across the 20 tasks where they differ, Grok 4.20 scores higher on 16 (SQL Generation, Code Review, Code Refactoring and others), Qwen3.5-Flash on 4 (Code Completion, JSON Extraction, Bulk Data Labeling and others).
Grok 4.20 was released in March 2026 and Qwen3.5-Flash in February 2026.
Pick Grok 4.20 if you need long documents or the stronger all-round task scores; pick Qwen3.5-Flash if you need lower cost or video input.
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 | SpaceXAI: Grok 4.20 | Qwen: Qwen3.5-Flash |
|---|---|---|
| SQL Generation | 144 | 134 |
| Code Review | 149 | 132 |
| Code Completion | 121 | 131 |
| Code Refactoring | 151 | 136 |
| Bug Fixing | 153 | 136 |
| Unit Test Generation | 134 | 124 |
| Code Documentation | 140 | 131 |
| Regex Writing | 127 | 119 |
| CI/CD Pipelines | 130 | 120 |
| Frontend Component Design | 131 | 122 |
| Data Analysis | 135 | 124 |
| CSV / Spreadsheet Cleanup | 138 | 134 |
| ETL Scripting | 141 | 128 |
| JSON Extraction | 123 | 131 |
| Bulk Data Labeling | 120 | 129 |
| OCR / Document Parsing | 135 | 131 |
| Table Extraction from PDFs | 135 | 131 |
| Long-Document Summarization | 153 | 138 |
| Short-Form Summarization | 119 | 123 |
| Blog Post Writing | 132 | 122 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →