MiniMax: MiniMax M3.1 Flash (free) vs OpenAI: GPT-6 Luna Pro (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-20.
| MiniMax: MiniMax M3.1 Flash (free) | OpenAI: GPT-6 Luna Pro (batch) | |
|---|---|---|
| Vendor | minimax | openai |
| Quality Score | 100 | 100 |
| Input Price | Free | $0.05/M |
| Output Price | Free | $0.25/M |
| Context Window | 1,000,000 | 1,050,000 |
| Max Output | 524,288 | 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, MiniMax M3.1 Flash (free) costs $0 and GPT-6 Luna Pro (batch) costs $0.11, so MiniMax M3.1 Flash (free) is free for the same work.
Both take in a similar amount of text: 1,000,000 and 1,050,000 tokens, about 1,500 and 1,575 pages.
Only MiniMax M3.1 Flash (free) offers video input.
Across the 6 tasks where they differ, MiniMax M3.1 Flash (free) scores higher on 6 (Code Completion, Code Documentation, Regex Writing and others).
MiniMax M3.1 Flash (free) was released in October 2026 and GPT-6 Luna Pro (batch) in September 2026.
Pick MiniMax M3.1 Flash (free) if you need lower cost, video input 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 | MiniMax: MiniMax M3.1 Flash (free) | OpenAI: GPT-6 Luna Pro (batch) |
|---|---|---|
| Code Completion | 132 | 131 |
| Code Documentation | 132 | 131 |
| Regex Writing | 120 | 119 |
| JSON Extraction | 132 | 131 |
| Bulk Data Labeling | 130 | 129 |
| Short-Form Summarization | 124 | 123 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →