Mistral: Mistral Medium 3.5 vs OpenAI: GPT-5.4
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 | |
|---|---|---|
| Vendor | mistralai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 53.0 | 89.6 |
| Input Price | $1.50/M | $2.50/M |
| Output Price | $7.50/M | $15.00/M |
| Context Window | 262,144 | 1,050,000 |
| Max Output | 209,715 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 49.4 | 84.8 |
| ai_index_agentic | 31.3 | 67.8 |
| ai_index_coding | 77.4 | 100.0 |
| eqbench | - | 75.6 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Mistral Medium 3.5 costs $3.38 and GPT-5.4 costs $6.25, so Mistral Medium 3.5 is about 1.9 times cheaper for the same work.
GPT-5.4 reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 393 pages for Mistral Medium 3.5.
On our blended benchmark score GPT-5.4 leads 89.6 to 53.0.
Across the 20 tasks where they differ, Mistral Medium 3.5 scores higher on 1 (Bulk Data Labeling), GPT-5.4 on 19 (SQL Generation, Code Review, Code Completion and others).
Mistral Medium 3.5 was released in April 2026 and GPT-5.4 in March 2026.
Pick Mistral Medium 3.5 if you need lower cost; pick GPT-5.4 if you need 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 |
|---|---|---|
| SQL Generation | 153 | 174 |
| Code Review | 147 | 175 |
| Code Completion | 116 | 120 |
| Code Refactoring | 144 | 173 |
| Bug Fixing | 155 | 187 |
| Unit Test Generation | 140 | 158 |
| Code Documentation | 131 | 146 |
| Regex Writing | 128 | 136 |
| CI/CD Pipelines | 132 | 149 |
| Frontend Component Design | 137 | 148 |
| Data Analysis | 151 | 173 |
| CSV / Spreadsheet Cleanup | 142 | 157 |
| ETL Scripting | 138 | 161 |
| JSON Extraction | 134 | 137 |
| Bulk Data Labeling | 123 | 122 |
| OCR / Document Parsing | 139 | 148 |
| Table Extraction from PDFs | 139 | 148 |
| Long-Document Summarization | 141 | 167 |
| Short-Form Summarization | 119 | 122 |
| Blog Post Writing | 129 | 143 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →