Xiaomi: MiMo-V2.5 vs OpenAI: GPT-5.3-Codex
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Xiaomi: MiMo-V2.5 | OpenAI: GPT-5.3-Codex | |
|---|---|---|
| Vendor | xiaomi | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 73.4 |
| Input Price | $0.40/M | $1.75/M |
| Output Price | $2.00/M | $14.00/M |
| Context Window | 1,000,000 | 400,000 |
| Max Output | 65,536 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | ✓ | - |
| Benchmark Scores | ||
| ai_index | - | 73.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, MiMo-V2.5 costs $0.90 and GPT-5.3-Codex costs $5.25, so MiMo-V2.5 is about 5.8 times cheaper for the same work.
MiMo-V2.5 reads up to 1,000,000 tokens at once, roughly 1,500 pages of text, against about 600 pages for GPT-5.3-Codex.
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), GPT-5.3-Codex on 16 (SQL Generation, Code Review, Code Refactoring and others).
MiMo-V2.5 was released in April 2026 and GPT-5.3-Codex in February 2026.
Pick MiMo-V2.5 if you need lower cost, long documents, audio input or video input; pick GPT-5.3-Codex 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 | Xiaomi: MiMo-V2.5 | OpenAI: GPT-5.3-Codex |
|---|---|---|
| SQL Generation | 133 | 141 |
| Code Review | 132 | 145 |
| Code Completion | 131 | 118 |
| Code Refactoring | 136 | 147 |
| Bug Fixing | 136 | 149 |
| Unit Test Generation | 124 | 132 |
| Code Documentation | 131 | 135 |
| Regex Writing | 119 | 124 |
| CI/CD Pipelines | 120 | 128 |
| Frontend Component Design | 122 | 130 |
| Data Analysis | 124 | 134 |
| CSV / Spreadsheet Cleanup | 133 | 135 |
| ETL Scripting | 128 | 138 |
| JSON Extraction | 131 | 120 |
| Bulk Data Labeling | 129 | 117 |
| OCR / Document Parsing | 131 | 134 |
| Table Extraction from PDFs | 131 | 134 |
| Long-Document Summarization | 137 | 148 |
| Short-Form Summarization | 123 | 116 |
| Blog Post Writing | 121 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →