DeepSeek: DeepSeek V4.1 Flash 1017 vs OpenAI: GPT-6 Luna Pro
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-19.
| DeepSeek: DeepSeek V4.1 Flash 1017 | OpenAI: GPT-6 Luna Pro | |
|---|---|---|
| Vendor | deepseek | openai |
| Quality Score | 100 | 100 |
| Input Price | $0.15/M | $0.10/M |
| Output Price | $0.60/M | $0.50/M |
| Context Window | 1,048,576 | 1,050,000 |
| Max Output | 393,216 | 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 DeepSeek V4.1 Flash 1017 costs $0.30, so GPT-6 Luna Pro is about 1.3 times cheaper for the same work.
Both take in a similar amount of text: 1,048,576 and 1,050,000 tokens, about 1,573 and 1,575 pages.
Across the 5 tasks where they differ, GPT-6 Luna Pro on 5 (Code Completion, Code Documentation, Regex Writing and others).
DeepSeek V4.1 Flash 1017 was released in October 2026 and GPT-6 Luna Pro in September 2026.
Pick GPT-6 Luna Pro if you need lower cost 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 | DeepSeek: DeepSeek V4.1 Flash 1017 | OpenAI: GPT-6 Luna Pro |
|---|---|---|
| Code Completion | 131 | 131 |
| Code Documentation | 131 | 131 |
| Regex Writing | 119 | 119 |
| JSON Extraction | 131 | 131 |
| Short-Form Summarization | 123 | 123 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →