Mistral: Mistral Small 4 vs MoonshotAI: Kimi K2.5
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Mistral: Mistral Small 4 | MoonshotAI: Kimi K2.5 | |
|---|---|---|
| Vendor | mistralai | moonshotai |
| Quality Score | 100 | 100 |
| Benchmark Score | 6.1 | 64.3 |
| Input Price | $0.15/M | $0.53/M |
| Output Price | $0.60/M | $3.33/M |
| Context Window | 262,144 | 262,144 |
| Max Output | 209,715 | 65,536 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 7.7 | 62.9 |
| eqbench | - | 55.2 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Mistral Small 4 costs $0.30 and Kimi K2.5 costs $1.36, so Mistral Small 4 is about 4.5 times cheaper for the same work.
Both read up to 262,144 tokens at once, roughly 393 pages of text.
On our blended benchmark score Kimi K2.5 leads 64.3 to 6.1.
Across the 20 tasks where they differ, Mistral Small 4 scores higher on 2 (JSON Extraction, Bulk Data Labeling), Kimi K2.5 on 18 (SQL Generation, Code Review, Code Completion and others).
Mistral Small 4 was released in March 2026 and Kimi K2.5 in January 2026.
Pick Mistral Small 4 if you need lower cost; pick Kimi K2.5 if you need benchmark performance 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 | Mistral: Mistral Small 4 | MoonshotAI: Kimi K2.5 |
|---|---|---|
| SQL Generation | 132 | 142 |
| Code Review | 127 | 145 |
| Code Completion | 129 | 131 |
| Code Refactoring | 129 | 145 |
| Bug Fixing | 131 | 149 |
| Unit Test Generation | 122 | 132 |
| Code Documentation | 127 | 135 |
| Regex Writing | 120 | 127 |
| CI/CD Pipelines | 118 | 128 |
| Frontend Component Design | 122 | 131 |
| Data Analysis | 125 | 136 |
| CSV / Spreadsheet Cleanup | 128 | 133 |
| ETL Scripting | 123 | 136 |
| JSON Extraction | 131 | 131 |
| Bulk Data Labeling | 129 | 128 |
| OCR / Document Parsing | 128 | 133 |
| Table Extraction from PDFs | 128 | 133 |
| Long-Document Summarization | 130 | 146 |
| Short-Form Summarization | 124 | 127 |
| Blog Post Writing | 120 | 130 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →