Xiaomi: MiMo-V2.5 vs SpaceXAI: Grok 4.20
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Xiaomi: MiMo-V2.5 | SpaceXAI: Grok 4.20 | |
|---|---|---|
| Vendor | xiaomi | x-ai |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 56.5 |
| Input Price | $0.40/M | $1.25/M |
| Output Price | $2.00/M | $2.50/M |
| Context Window | 1,000,000 | 2,000,000 |
| Max Output | 65,536 | 1,800,000 |
| 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, MiMo-V2.5 costs $0.90 and Grok 4.20 costs $1.88, so MiMo-V2.5 is about 2.1 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 MiMo-V2.5.
Only MiMo-V2.5 offers audio input and video input.
Across the 20 tasks where they differ, MiMo-V2.5 scores higher on 4 (Code Completion, JSON Extraction, Bulk Data Labeling and others), Grok 4.20 on 16 (SQL Generation, Code Review, Code Refactoring and others).
MiMo-V2.5 was released in April 2026 and Grok 4.20 in March 2026.
Pick MiMo-V2.5 if you need lower cost, audio input or video input; pick Grok 4.20 if you need long documents 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 | Xiaomi: MiMo-V2.5 | SpaceXAI: Grok 4.20 |
|---|---|---|
| SQL Generation | 133 | 144 |
| Code Review | 132 | 149 |
| Code Completion | 131 | 121 |
| Code Refactoring | 136 | 151 |
| Bug Fixing | 136 | 153 |
| Unit Test Generation | 124 | 134 |
| Code Documentation | 131 | 140 |
| Regex Writing | 119 | 127 |
| CI/CD Pipelines | 120 | 130 |
| Frontend Component Design | 122 | 131 |
| Data Analysis | 124 | 135 |
| CSV / Spreadsheet Cleanup | 133 | 138 |
| ETL Scripting | 128 | 141 |
| JSON Extraction | 131 | 123 |
| Bulk Data Labeling | 129 | 120 |
| OCR / Document Parsing | 131 | 135 |
| Table Extraction from PDFs | 131 | 135 |
| Long-Document Summarization | 137 | 153 |
| Short-Form Summarization | 123 | 119 |
| Blog Post Writing | 121 | 132 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →