SpaceXAI: Grok 4.5 vs Mistral: Mistral Medium 3.5
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| SpaceXAI: Grok 4.5 | Mistral: Mistral Medium 3.5 | |
|---|---|---|
| Vendor | x-ai | mistralai |
| Quality Score | 100 | 100 |
| Benchmark Score | 91.2 | 53.0 |
| Input Price | $2.00/M | $1.50/M |
| Output Price | $6.00/M | $7.50/M |
| Context Window | 500,000 | 262,144 |
| Max Output | 450,000 | 209,715 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 88.8 | 49.4 |
| ai_index_agentic | 75.4 | 31.3 |
| ai_index_coding | 100.0 | 77.4 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Mistral Medium 3.5 costs $3.38 and Grok 4.5 costs $3.50, so Mistral Medium 3.5 is slightly cheaper for the same work.
Grok 4.5 reads up to 500,000 tokens at once, roughly 750 pages of text, against about 393 pages for Mistral Medium 3.5.
On our blended benchmark score Grok 4.5 leads 91.2 to 53.0.
Across the 20 tasks where they differ, Grok 4.5 scores higher on 20 (SQL Generation, Code Review, Code Completion and others).
Grok 4.5 was released in July 2026 and Mistral Medium 3.5 in April 2026.
Pick Grok 4.5 if you need long documents, benchmark performance or the stronger all-round task scores; pick Mistral Medium 3.5 if you need lower cost.
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 4.5 | Mistral: Mistral Medium 3.5 |
|---|---|---|
| SQL Generation | 171 | 153 |
| Code Review | 167 | 147 |
| Code Completion | 120 | 116 |
| Code Refactoring | 164 | 144 |
| Bug Fixing | 180 | 155 |
| Unit Test Generation | 154 | 140 |
| Code Documentation | 142 | 131 |
| Regex Writing | 135 | 128 |
| CI/CD Pipelines | 144 | 132 |
| Frontend Component Design | 146 | 137 |
| Data Analysis | 170 | 151 |
| CSV / Spreadsheet Cleanup | 154 | 142 |
| ETL Scripting | 154 | 138 |
| JSON Extraction | 139 | 134 |
| Bulk Data Labeling | 125 | 123 |
| OCR / Document Parsing | 146 | 139 |
| Table Extraction from PDFs | 146 | 139 |
| Long-Document Summarization | 159 | 141 |
| Short-Form Summarization | 123 | 119 |
| Blog Post Writing | 140 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →