Mistral: Mistral Large 4 vs OpenAI: GPT-6 Luna Pro
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-07.
| Mistral: Mistral Large 4 | OpenAI: GPT-6 Luna Pro | |
|---|---|---|
| Vendor | mistralai | openai |
| Quality Score | 100 | 100 |
| Input Price | $0.68/M | $0.10/M |
| Output Price | $2.09/M | $0.50/M |
| Context Window | 524,288 | 1,050,000 |
| Max Output | 262,144 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-6 Luna Pro costs $0.23 and Mistral Large 4 costs $1.20, so GPT-6 Luna Pro is about 5.3 times cheaper for the same work.
GPT-6 Luna Pro 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 10 tasks where they differ, GPT-6 Luna Pro on 10 (SQL Generation, Code Completion, Code Documentation and others).
Mistral Large 4 was released in October 2026 and GPT-6 Luna Pro in September 2026.
Pick GPT-6 Luna Pro 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 Pro |
|---|---|---|
| SQL Generation | 133 | 133 |
| Code Completion | 131 | 131 |
| Code Documentation | 131 | 131 |
| Regex Writing | 119 | 119 |
| CSV / Spreadsheet Cleanup | 133 | 133 |
| JSON Extraction | 131 | 131 |
| Bulk Data Labeling | 129 | 129 |
| Long-Document Summarization | 137 | 137 |
| Short-Form Summarization | 123 | 123 |
| Blog Post Writing | 121 | 121 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →