Mistral: Mistral Large 4 vs OpenAI: GPT-6 Luna (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-07.
| Mistral: Mistral Large 4 | OpenAI: GPT-6 Luna (batch) | |
|---|---|---|
| Vendor | mistralai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 63.8 |
| Input Price | $0.68/M | $0.05/M |
| Output Price | $2.09/M | $0.25/M |
| Context Window | 524,288 | 1,050,000 |
| Max Output | 262,144 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | - | 62.9 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-6 Luna (batch) costs $0.11 and Mistral Large 4 costs $1.20, so GPT-6 Luna (batch) is about 10.7 times cheaper for the same work.
GPT-6 Luna (batch) reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 786 pages for Mistral Large 4.
Across the 20 tasks where they differ, GPT-6 Luna (batch) on 20 (SQL Generation, Code Review, Code Completion and others).
Mistral Large 4 was released in October 2026 and GPT-6 Luna (batch) in September 2026.
Pick GPT-6 Luna (batch) if you need lower cost, long documents 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 Large 4 | OpenAI: GPT-6 Luna (batch) |
|---|---|---|
| SQL Generation | 133 | 141 |
| Code Review | 132 | 144 |
| Code Completion | 131 | 133 |
| Code Refactoring | 136 | 146 |
| Bug Fixing | 136 | 148 |
| Unit Test Generation | 124 | 131 |
| Code Documentation | 131 | 137 |
| Regex Writing | 119 | 126 |
| CI/CD Pipelines | 120 | 127 |
| Frontend Component Design | 122 | 129 |
| Data Analysis | 124 | 133 |
| CSV / Spreadsheet Cleanup | 133 | 136 |
| ETL Scripting | 128 | 136 |
| JSON Extraction | 131 | 131 |
| Bulk Data Labeling | 129 | 129 |
| OCR / Document Parsing | 131 | 134 |
| Table Extraction from PDFs | 131 | 134 |
| Long-Document Summarization | 137 | 148 |
| Short-Form Summarization | 123 | 127 |
| Blog Post Writing | 121 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →