DeepSeek: DeepSeek V4.1 Flash 1017 vs OpenAI: GPT Luna Latest
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-19.
| DeepSeek: DeepSeek V4.1 Flash 1017 | OpenAI: GPT Luna Latest | |
|---|---|---|
| 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 Luna Latest costs $0.23 and DeepSeek V4.1 Flash 1017 costs $0.30, so GPT Luna Latest 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 Luna Latest on 5 (Code Completion, Code Documentation, Regex Writing and others).
DeepSeek V4.1 Flash 1017 was released in October 2026 and GPT Luna Latest in September 2026.
Pick GPT Luna Latest 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 Luna Latest |
|---|---|---|
| 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 →