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GPT-6 Luna vs DeepSeek V4 Flash 0423

The honest throughput comparison: DeepSeek's flash tier is cheaper still per output token, and it cannot read an image, which GPT-6 Luna can.

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

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

DeepSeek V4 Flash 0423

DeepSeek

DeepSeek V4 Flash is an efficiency-optimized Mixture-of-Experts model from DeepSeek with 284B total parameters and 13B activated parameters, supporting a 1M-token context window.

Provider
DeepSeek
Context window
1.0M tokens
Input price
0.36 credits / 1M tokens ($0.030 raw)
Output price
15.4 credits / 1M tokens ($1.28 raw)
Vision (image input)
No
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
  • 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 GPT-6 Luna and DeepSeek V4 Flash 0423 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 GPT-6 Luna and DeepSeek V4 Flash 0423?
GPT-6 Luna is about 2.6x cheaper on output tokens (6.0 vs 15.4 credits per 1M). GPT-6 Luna accepts images; DeepSeek V4 Flash 0423 is text-only. GPT-6 Luna is the newer release (September 2026 vs April 2026).
Is GPT-6 Luna or DeepSeek V4 Flash 0423 cheaper?
GPT-6 Luna is cheaper: 6.0 credits per million output tokens against 15.4. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
Which has the larger context window, GPT-6 Luna or DeepSeek V4 Flash 0423?
GPT-6 Luna, at 1.1M tokens against 1.0M.
Can I use both GPT-6 Luna and DeepSeek V4 Flash 0423 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 GPT-6 Luna and DeepSeek V4 Flash 0423 need a paid plan?
One of the two is open to free accounts; the other needs a paid plan (Plus or above).

Related comparisons

GPT-6 Luna detailsDeepSeek V4 Flash 0423 detailsAll comparisons

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