Mistral: Mistral Medium 3.5 vs OpenAI: GPT-5.4 Nano
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Mistral: Mistral Medium 3.5 | OpenAI: GPT-5.4 Nano | |
|---|---|---|
| Vendor | mistralai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 53.0 | 68.1 |
| Input Price | $1.50/M | $0.20/M |
| Output Price | $7.50/M | $1.25/M |
| Context Window | 262,144 | 400,000 |
| Max Output | 209,715 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 49.4 | 63.1 |
| ai_index_agentic | 31.3 | 45.4 |
| ai_index_coding | 77.4 | 92.5 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.4 Nano costs $0.51 and Mistral Medium 3.5 costs $3.38, so GPT-5.4 Nano is about 6.6 times cheaper for the same work.
GPT-5.4 Nano reads up to 400,000 tokens at once, roughly 600 pages of text, against about 393 pages for Mistral Medium 3.5.
On our blended benchmark score GPT-5.4 Nano leads 68.1 to 53.0.
Across the 20 tasks where they differ, GPT-5.4 Nano on 20 (SQL Generation, Code Review, Code Completion and others).
Mistral Medium 3.5 was released in April 2026 and GPT-5.4 Nano in March 2026.
Pick GPT-5.4 Nano if you need lower cost, long documents, 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 Medium 3.5 | OpenAI: GPT-5.4 Nano |
|---|---|---|
| SQL Generation | 153 | 163 |
| Code Review | 147 | 158 |
| Code Completion | 116 | 133 |
| Code Refactoring | 144 | 157 |
| Bug Fixing | 155 | 168 |
| Unit Test Generation | 140 | 148 |
| Code Documentation | 131 | 140 |
| Regex Writing | 128 | 132 |
| CI/CD Pipelines | 132 | 139 |
| Frontend Component Design | 137 | 141 |
| Data Analysis | 151 | 159 |
| CSV / Spreadsheet Cleanup | 142 | 151 |
| ETL Scripting | 138 | 148 |
| JSON Extraction | 134 | 146 |
| Bulk Data Labeling | 123 | 134 |
| OCR / Document Parsing | 139 | 144 |
| Table Extraction from PDFs | 139 | 144 |
| Long-Document Summarization | 141 | 154 |
| Short-Form Summarization | 119 | 130 |
| Blog Post Writing | 129 | 135 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →