DeepSeek V4.1 Flash (1017) vs GPT-6 Luna Pro: price, context window and capabilities
DeepSeek V4.1 Flash (1017, deepseek/deepseek-v4.1-flash-1017) from DeepSeek and GPT-6 Luna Pro (openai/gpt-6-luna-pro) from OpenAI are both multimodal language models on the OceanToken API. GPT-6 Luna Pro costs less per token than DeepSeek V4.1 Flash: $0.10 against $0.21 per 1M input tokens (52% less) and $0.50 against $0.84 per 1M output tokens (40% less). Their context windows are almost the same size, about 1.05M tokens: GPT-6 Luna Pro takes 1,050,000 tokens and DeepSeek V4.1 Flash 1,048,576. Both support tool calling, reasoning, structured outputs and image input; only GPT-6 Luna Pro also lists file input.
Side by side
| Spec | DeepSeek V4.1 Flash −40% | GPT-6 Luna Pro |
|---|---|---|
| Model | DeepSeek V4.1 Flash (1017)deepseek/ | GPT-6 Luna Proopenai/ |
| Publisher | DeepSeek | OpenAI |
| Kind | Text & vision | Text & vision |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,050,000 |
| Input price | $0.21 / 1M tokens | $0.10 / 1M tokens |
| Output price | $0.84 / 1M tokens | $0.50 / 1M tokens |
| Cached input price | $0.006 / 1M tokens | $0.01 / 1M tokens |
| Cache write price | – | $0.125 / 1M tokens |
| Web search price | – | $0.01 / search |
| Discount (vs official, top tier) | −40% | — |
| Inputs | text and images | text, images and files |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose GPT-6 Luna Pro to spend less per token: 52% less for input and 40% less for output than DeepSeek V4.1 Flash.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose GPT-6 Luna Pro if you need file input: DeepSeek V4.1 Flash does not list it.
- Not sure? Call both with the same OceanToken API key and compare them on your own prompts; each request is billed per use from one prepaid balance.
Get API Key DeepSeek V4.1 Flash GPT-6 Luna Pro
Frequently asked questions
Which is cheaper, DeepSeek V4.1 Flash or GPT-6 Luna Pro?
GPT-6 Luna Pro. GPT-6 Luna Pro costs less per token than DeepSeek V4.1 Flash: $0.10 against $0.21 per 1M input tokens (52% less) and $0.50 against $0.84 per 1M output tokens (40% less). These are OceanToken starting prices per use; the OceanToken console always shows the current price.
Which has the larger context window, DeepSeek V4.1 Flash or GPT-6 Luna Pro?
GPT-6 Luna Pro, by 1,424 tokens. Their context windows are almost the same size, about 1.05M tokens: GPT-6 Luna Pro takes 1,050,000 tokens and DeepSeek V4.1 Flash 1,048,576.
Can I call both DeepSeek V4.1 Flash and GPT-6 Luna Pro with one API key?
Yes. Both are on the OceanToken API at https://api.oceantoken.ai/v1: one API key and one prepaid balance call either model. Send the model id deepseek/deepseek-v4.1-flash-1017 or openai/gpt-6-luna-pro.
Models and publishers
DeepSeek V4.1 Flash · GPT-6 Luna Pro · All DeepSeek models · All OpenAI models
More comparisons
DeepSeek V4.1 Flash vs Claude Opus 5.5 · DeepSeek V4.1 Flash vs Claude Fable 5.1 · DeepSeek V4.1 Flash vs Claude Opus 5 · DeepSeek V4.1 Flash vs GPT-6 Sol · All comparisons