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DeepSeek V4.1 Flash vs GPT-6 Luna

DeepSeek's newest flash tier against OpenAI's value tier: the two cheapest serious options here, and neither one can read an image.

Figures as of , read live from the model registry Zeplik bills against.

What the numbers say

Derived from the live registry Zeplik routes and bills against. Credits: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.

Side by side

DeepSeek V4.1 Flash

DeepSeek

DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture.

Provider
DeepSeek
Context window
1.0M tokens
Input price
0.54 credits / 1M tokens ($0.045 raw)
Output price
6.0 credits / 1M tokens ($0.50 raw)
Vision (image input)
Yes
Tool calling
Yes
Extended reasoning
No

Best for

  • High-volume everyday tasks where speed and cost matter: summaries, drafts, quick questions
  • Very long documents and codebases: a 1.0M-token window fits entire books or repositories in one conversation
  • Working with images: screenshots, charts, photos and scanned documents alongside text
  • Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

GPT-6 Luna

OpenAI

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol.

Provider
OpenAI
Context window
1.1M tokens
Input price
1.2 credits / 1M tokens ($0.10 raw)
Output price
6.0 credits / 1M tokens ($0.50 raw)
Vision (image input)
Yes
Tool calling
Yes
Extended reasoning
No

Best for

  • Balanced everyday work: writing, questions, brainstorming and summarization
  • Very long documents and codebases: a 1.1M-token window fits entire books or repositories in one conversation
  • Working with images: screenshots, charts, photos and scanned documents alongside text
  • Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Try both on Zeplik

The honest answer to most model debates is to run your own prompt on both. Zeplik puts DeepSeek V4.1 Flash and GPT-6 Luna in the same chat, so you can switch mid-conversation and compare answers on the work you actually do.

Pick a model and ask. Your prompt opens in the Zeplik app with that model selected.

Model to ask

Frequently asked questions

What is the difference between DeepSeek V4.1 Flash and GPT-6 Luna?
Output pricing is close: 6.0 vs 6.0 credits per 1M tokens. GPT-6 Luna is the newer release (September 2026 vs September 2026).
Is DeepSeek V4.1 Flash or GPT-6 Luna cheaper?
They cost the same on output tokens: 6.0 credits per million each. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
Which has the larger context window, DeepSeek V4.1 Flash or GPT-6 Luna?
GPT-6 Luna, at 1.1M tokens against 1.0M.
Can I use both DeepSeek V4.1 Flash and GPT-6 Luna on Zeplik?
Yes. Zeplik is a multi-model chat, so both sit behind one account and you can switch between them mid-conversation to compare answers on your own prompt.
Do DeepSeek V4.1 Flash and GPT-6 Luna need a paid plan?
Both need a paid plan (Plus or above). Usage is then billed in credits from your monthly allowance.

Related comparisons

DeepSeek V4.1 Flash detailsGPT-6 Luna detailsAll comparisons

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