WhichBot › Compare › DeepSeek V4.1 Flash vs GPT-6 Luna
Last checked Oct 28, 2026 · plain English · no paid picks
DeepSeek V4.1 Flash vs GPT-6 Luna
Short answer: neither wins at everything.
Pick DeepSeek V4.1 Flash if price matters most, and you're fine with your data being stored in China.
Pick GPT-6 Luna if you want OpenAI's cheapest current model for light tasks.
DeepSeek V4.1 Flash vs GPT-6 Luna side by side
| DeepSeek V4.1 Flash | GPT-6 Luna | |
|---|---|---|
| What it is | Low-cost model from DeepSeek (China) | OpenAI's low-cost model |
| Made by | DeepSeek | OpenAI |
| Price | Developer price: $0.15 in and $0.60 out per million tokens | Developer price: $0.10 in and $0.50 out per million tokens |
| Good at | Very low developer service price; 1M context; vision; Open weights (you can download and run it yourself); Reads up to 1,048,576 tokens at once; Reads: text, image | Best for: cheap, light tasks; Reads up to 1,050,000 tokens at once; Reads: text, image, PDFs |
| Watch out for | Peak-hour prices are double. Web search/fetch calls made through Claude Code, Codex or DeepSeek Harness are free now but billed from Oct 31, 2026, 9 AM PT ($0.75 per 1,000 requests) | Not listed in our data |
| Privacy | Data is collected, processed and stored in China; inputs may train models unless you opt out in settings | Not listed in our data |
| Where it runs | Not listed in our data | ChatGPT Go |
| Status | Current. Upgraded Oct 17, 2026 to DeepSeek-V4.1-Flash-1017 on the developer service, website and app; same model name (deepseek-flash) and same price. DeepSeek says it finishes tasks faster with shorter answers. Weights on Hugging Face | Current. Named replacement for GPT-4o / 4.1 family |
| Sources | api-docs.deepseek.com · models.dev · cdn.deepseek.com · api-docs.deepseek.com (2) · api-docs.deepseek.com (3) | platform.openai.com · chatgpt.com · models.dev |
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Questions people ask
Is DeepSeek V4.1 Flash or GPT-6 Luna better?
It depends on what you do. Pick DeepSeek V4.1 Flash if price matters most, and you're fine with your data being stored in China. Pick GPT-6 Luna if you want OpenAI's cheapest current model for light tasks.
How does WhichBot decide?
Hector uses a written rubric: everyday usefulness, cost and free plans, privacy, reliability, ease of use, availability and safety. Rankings are one input, not the answer.
Facts come from the companies' own pages, linked above, and were last checked Oct 28, 2026. Prices are US and can change. Picks are Hector's: no paid picks, sponsors always labeled, and no sponsorship from AI labs. Our policy.